Re: [Gimp-user] blue + yellow = green

2006-02-28 Thread Rikard Johnels
On Tuesday 28 February 2006 06:17, Carol Spears wrote:
 On Mon, Feb 27, 2006 at 09:01:30PM -0800, Carol Spears wrote:
  gimp (the way it was made) is a much better way to learn image
  manipulation.  one more time, if changing from photoshop to gimp is a
  problem and changing from gimp to photoshop is a problem -- wherein are
  the gimp design problems?

 this sentence makes no sense, sorry.  allow me to fix it:

 gimp (the way it was made) is a much better way to learn image
 manipulation.  one more time, if changing from photoshop to gimp is a
 problem and changing from gimp to photoshop is not a problem --
 wherein are the gimp design problems?

 sorry.

 carol

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I cant help but add a few of my personal thoughts on this topic..

I use GIMP because it ISNT PS. AND the fact that PS doesn't readily run on my 
favorite OS. Where as GIMP runs on at least 3 different ones...
This in it self add conciderable to my choice. I can have three different 
studios running Linux, Windows and OSX and still have a homogenous image 
manipulating software. (BIG plus in my book)

Second; If changing from PS to GIMP is a bigger hurdle than changing the other 
way around, its not GIMP's fault. Its a problem behind the keyboard.
I have never liked PS cluttered layout, and have found GIMP's interface alot 
easier to handle. So in MY case changing TO GIMP never was much of a 
question.

There are all kinds of talks about PS being more advanced, have lots more 
plugins etc.
So? If a commercial software thats been around for so many years as PS, DIDN'T 
have more bells and whistles than a uncommercial piece that only been 
around a few years, I'd be more then surpriced. 
GIMP started very small and has, in a short few years grown conciderable.

So back to the topic...
WHY would you want to make GIMP look like PS??
WHY would you change layout to something, in my mind, inferior?
If i want to have PS i'd run PS. 

I run GIMP because it more then fits my needs.
I run GIMP because i find it easier to use.
And i DO run GIMP because it's free for me to use.
I dont want to, and dont have the money to spend on new versions and releases.

Now mind you, i do NOT slight those who want to take babysteps.
Bus as Carol said. Its not very smart.

Getting from A to B is one step. Sure it might be a big one.
But why cut it up in small steps?
Its like exchanging your softwarebase in steps.
First lets take out the database. and Learn a way of making the old and new 
software work in unison.
Then lets exchange the reporttool. And get more problems as the new system 
doesn't talk to the clients.
And as last step (after lots of headaches and patching scripts) lets exchange 
the clients.
Now the only thing we have to do is educate the users a third time to make 
everyting work again.
And thus ending up at B as planned from the beginning.

Bottom line, why change a program into sometingelse just cause its looks and 
handles as the old one?
Wouldn't it be better to stay with the old in that case?
And the parts of forking. Its sure is easier to steal an idea and fiddle with 
it so it looks as it mine, than it is coming to an agreement of a certain way 
of operation. But is it fair play? Is it well done?

I think not.

These are my own personal thoughts on the matter.
So don't go flaming the community for what i write here.

Any complaints will be duly read, and answered to if i find them relevant.



With a sincere thanks to the developers, maintainers and people working and 
improving GIMP...

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Re: [Gimp-user] blue + yellow = green

2006-02-28 Thread Bram Kuijper




Rikard Johnels wrote:

  On Tuesday 28 February 2006 06:17, Carol Spears wrote:
  
  
On Mon, Feb 27, 2006 at 09:01:30PM -0800, Carol Spears wrote:


  gimp (the way it was made) is a much better way to learn image
manipulation.  one more time, if changing from photoshop to gimp is a
problem and changing from gimp to photoshop is a problem -- wherein are
the gimp design problems?
  

this sentence makes no sense, sorry.  allow me to fix it:

gimp (the way it was made) is a much better way to learn image
manipulation.  one more time, if changing from photoshop to gimp is a
problem and changing from gimp to photoshop is not a problem --
wherein are the gimp design problems?

sorry.

carol

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I cant help but add a few of my personal thoughts on this topic..

I use GIMP because it ISNT PS. AND the fact that PS doesn't readily run on my 


  favorite OS. Where as GIMP runs on at least 3 different ones...
This in it self add conciderable to my choice. I can have three different 
"studios" running Linux, Windows and OSX and still have a homogenous image 
manipulating software. (BIG plus in my book)
  

It is indeed a big plus to have GIMP on all three systems, but the GUI
is therefore somewhat restricted. The GTK GUI developed is clearly
different from what windows users are used to. Do I hear "I don't care
about Photoshop/Windows Users that want to transfer to GIMP?"... then
why was GIMP compiled for windows at all, just for a bunch people that
were patient enough to learn it? Doesn't a good GUI distinguish itself
by a seamless integration into various OS's without having to re-learn
how window handling works (for a Photoshop user it is quite a step to a
document interface with alt+tabbing to the various menus involved) or
relearn all shortcut keys (e.g. it would be a great future improvement
if the user can say if it will use a 'Photoshop/Windows' shortcut key
profile, or an original GIMP shortcut key profile).

  
Second; If changing from PS to GIMP is a bigger hurdle than changing the other 
way around, its not GIMP's "fault". 

Sure? Again, doesn't it say something about general usability of GIMP's
GUI? A good GUI is characterized that it is 'understandable' by the
great majority of users, inexperienced, experienced using other
software platforms and experienced using GIMP. I work with GIMP daily
and I try to convince other people that GIMP is a good choice. But I
see also that all these users have larger difficulties to learn GIMP
compared to other graphical software, because they have been already
'poisoned' with general Windows GUIs (eg., GUIs in which menu's are
always within the program interface and not separate 'windows', a
standard set of shortcut keys, file menu handlers that are different
from the GTK ones). If GIMP developers just ignore that, it sounds to
me as if they just deliberately confine their software to a particular
(and small) group of people. That is a big pity, because I believe that
the more people use GIMP, the better the program becomes and the bigger
the chances are that such OSS software stays on and remains in
development.

  Its a problem behind the keyboard.
I have never liked PS cluttered layout, and have found GIMP's interface alot 
easier to handle. So in MY case changing TO GIMP never was much of a 
question.
  

In your case changing to gimp was never much of a question. Would the
same go for other graphical software users? Or "do they just have to
stick with Photoshop"?

  
There are all kinds of talks about PS being more advanced, have lots more 
plugins etc.
So? If a commercial software thats been around for so many years as PS, DIDN'T 
have more "bells and whistles" than a "uncommercial" piece that only been 
around a few years, I'd be more then surpriced. 
GIMP started very small and has, in a short few years grown conciderable.

  

I totally agree with that, great go GIMP. But it is not the time to be
complacent and just think that GIMP is 'perfect and otherwise bug off
to other software'. There are more graphical software users on this
planet that appreciate the goals of GIMP, but still can't do what they
want with it. Should we just ignore the wishes of this future user
group and go on with only doing what the current community wants? If
so, than don't get mad about more of such forks in the future.

  So back to the topic...
WHY would you want to make GIMP look like PS??
  

Nope, I think he/she wants GIMP to be "more usable" for a wider range
of users than it is now. It just happens that a large amount of users
that think of switching to GIMP are PS users. Geez, how strange that
people then propose improvements of the GIMP GUI that are inspired by
PS's GUI? Are those wishes just totally ignored by people that claim to
have a 'better' idea how software has to 

Re: [Gimp-user] blue + yellow = green

2006-02-28 Thread Michael Schumacher
 Von: Bram Kuijper [EMAIL PROTECTED]

 Do I hear I don't care about Photoshop/Windows Users that want to 
 transfer to GIMP?... then why was GIMP compiled for windows at all, just 
 for a bunch people that were patient enough to learn it? 

FYI, it was compiled for windows because someone wanted to use his scanner
(which did only come with Windows drivers) with it.

And it is not a good idea to make the developers reconsider why something is
still being maintained for a particular platform :)


HTH,
Michael

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Re: [Gimp-user] blue + yellow = green

2006-02-28 Thread Tom Williams
Bram Kuijper wrote:
 Sure? Again, doesn't it say something about general usability of
 GIMP's GUI? A good GUI is characterized that it is 'understandable' by
 the great majority of users, inexperienced, experienced using other
 software platforms and experienced using GIMP. I work with GIMP daily
 and I try to convince other people that GIMP is a good choice. But I
 see also that all these users have larger difficulties to learn GIMP
 compared to other graphical software, because they have been already
 'poisoned' with general Windows GUIs (eg., GUIs in which menu's are
 always within the program interface and not separate 'windows', a
 standard set of shortcut keys, file menu handlers that are different
 from the GTK ones). If GIMP developers just ignore that, it sounds to
 me as if they just deliberately confine their software to a particular
 (and small) group of people. That is a big pity, because I believe
 that the more people use GIMP, the better the program becomes and the
 bigger the chances are that such OSS software stays on and remains in
 development.
(snip)
 Nope, I think he/she wants GIMP to be more usable for a wider range
 of users than it is now. It just happens that a large amount of users
 that think of switching to GIMP are PS users. Geez, how strange that
 people then propose improvements of the GIMP GUI that are inspired by
 PS's GUI? Are those wishes just totally ignored by people that claim
 to have a 'better' idea how software has to work?
I disagree with you on these two points.  A friend of mine fairly
recently started using Gimp for her own photo manipulation (resizing and
other basic functions).  She's running Windows XP and Windows is *all*
she knows (meaning she has no Mac or *nix experience whatsoever).   I'm
not sure if she had seen PhotoShop or not before but Gimp was her first
hands-on experience with any tool of it's nature.  She obviously
didn't know what any of the tools or functions were simply because she
had never used a tool like Gimp before.

Given that, she's gotten her head wrapped around the tool such that she
understands how to use some of the functions it performs and can
manipulate her images mostly as she wants (she's still learning how to
do things, as am I).  The point being, she had definitely been
poisoned by the general Windows UI and that wasn't a factor in her
Gimp experience.  Gimp looking exactly like PhotoShop or even MS Word
didn't change the fact she had no idea what a layer was or what a crop
tool was.  This brings me to the second point.

PS users wanting Gimp to look and affectively act like PS simply want
Gimp to be a free PS, so they can use it legally without having to pay
a boatload of money or without having to pirate a copy.  PS users are
very familiar with the PS UI (which is as overwhelming and user
UN-friendly as people can argue Gimp is) and aren't willing or aren't
capable of opening their minds to a different way of doing things.  This
is like a Windows user who complains about not being able to make Mac OS
X or Linux behave just like Windows or the Windows user who can't
differentiate between a word processor and Word (in this case, they
think ALL word processors are Word and assume everyone with a computer
has Word).

I think those who focus their expertise on the functions being performed
will have an easier time using ANY kind of PS-like app since it will be
a matter of finding or learning how any given app performs those
functions.  Those who focus their expertise on learning the UI get
programmed to the point of not having any chance of being productive
if the UI they are used to isn't around.

By virtue of the fact Gimp was chosen as the basis of Gimpshop, that
proves Gimp is very functional and does work.  The problem for PS users
is they simply can't let go of the PS UI and Gimpshop was born.

Now, I believe (could be mistaken) it's been the position of the Gimp
developers that Gimp is not intended to be PhotoShop so why change the
entire UI to look/act like PhotoShop?  It's not like attracting 50,000
PhotoShop users will result in tremendous donations to the Gimp
development effort or anything.  Of course, it would make those
PhotoShop users very happy since they get to almost have their cake and
eat it too. :)

I think a PhotoShop compatibility mode, that is integrated in Gimp,
would be a good compromise.  That way people still use Gimp first and
foremost and can simply have it look like PS instead of trying to change
Gimp into something it's not necessarily wanting or trying to be.

My $0.03...  :)

Peace

Tom
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Re: [Gimp-user] blue + yellow = green

2006-02-27 Thread Robert Citek


Hello Carol,

On Feb 25, 2006, at 12:18 PM, Carol Spears wrote:

first thing.  in keeping with the spirit of how gimpshop came to be, i
am curious if there are separate online resources for this  
application.

they opted (probably for really good reasons) to go on their own to
provide software for what is probably a large group of users.

perhaps you could list gimpshop resources here so that the gimp users
can redirect the gimpshop questions to the proper place.

personally, i do not want to interfer with them.  they filled a nitch
and did this without the gimp developers.  i suspect they had really
good reasons to do this.  it would be wrong, in my opinion, to  
start to

help them now -- keeping with the spirit of their project.


From your writing tone, I sense a bit of a rift between Gimp and  
Gimpshop.  I find that odd given that I did not sense it at the  
Gimpshop site.  While there I heard nothing but praise and references  
back to Gimp.org, but admittedly I didn't set out to find animosity.


From what I have read, Gimpshop is the Gimp with a skin to make it  
a bit more like Photoshop.  From using it myself I would have to say  
that is a fair assessment.  No question, Gimpshop is not Photoshop,  
nor did I expect it to be.  I expected it to be the Gimp with a  
twist, which, as far as I can tell, it is.


For me Gimpshop is a way for me to introduce the Gimp to other  
volunteers that I work with at a local non-profit.   We take in old  
computers, refurbish them, use them to teach under-served kids in  
grades 4-8 how to use computers, and then give the computers to the  
students at the end of the session which last about 8 weeks.  The non- 
profit already has a tremendous amount of material for teaching  
Photoshop (my guess would be some pared-down version).  Plus  
Photoshop is something the existing volunteers are very familiar  
with.  However, because of technical, legal, and financial  
constraints, we have decided to migrate to using and teaching Open  
Source.  The Gimp seems to be a natural choices for image  
manipulation, with the Gimpshop providing a smooth migration path  
given our existing Photoshop infrastructure.  Sure, eventually we'll  
migrate completely to the Gimp.  But for now, it's baby steps.


For me Gimpshop is also a way to learn about image manipulation.  I  
know nothing about Photoshop nor the Gimp nor Gimpshop nor any other  
image manipulation program.  (Actually, I used to know PaintShop pro,  
but that was over a decade ago, so it may as well be as though I know  
nothing.)  So, I decided to take an on-line course on Photoshop.  But  
instead of using Photoshop I'm using Gimpshop.  So far, it has been  
working pretty well.  I can follow along pretty closely, although  
Gimpshop does do some things a bit differently, which is OK.  What's  
really pleasant is that the forums have a nice mix of neophytes like  
myself and pros, who help out us neophytes.  And us neophytes can  
come up with some pretty basic questions.  But that's OK, too.  After  
all it is a beginning course on Photoshop.


Which brings us to resources.  The only resource I know of that is  
specifically about Gimpshop is the Gimpshop website, which appears to  
be little more than a blog.  There do not appear to be any forums or  
mailing lists or IRC channels or on-line courses.  Just a download  
link and a blog.  But as far as I can tell Gimpshop is not about  
image manipulation, but rather about putting a Photoshop-like skin on  
top of Gimp.  By putting a Photoshop-like skin on the Gimp, all the  
resources that one normally uses for Photoshop (books, on-line  
tutorials, forums, courses, co-workers, etc.) all become available to  
Gimpshop users.  In addition to the Photoshop resources, in only  
makes sense (at least it did to me) that all of the Gimp resources  
become available, too, given that underneath Gimpshop runs the Gimp.


As for providing help, that is entirely a personal choice.  If you  
feel that by helping me you are helping them over at Gimpshop and you  
feel strongly about not helping them over at Gimpshop for whatever  
reason, then do not help me.  That's OK.  To me image manipulation is  
just a hobby.  It's fun.  It's challenging.  It's something new for  
me to learn.  It's something for me to show my family and friends.  I  
enjoy Open Source for the same reasons.  It's fun.  It's  
challenging.  It's a way to develop a community of users and friends.


In summary, I like Gimpshop and the Gimp and have come to understand  
that this forum is perhaps not a friendly place to mention Gimpshop.   
OK.  Fair enough.  Them's the rules.  In the future I will refrain  
from mentioning Gimpshop and make sure my questions and any answers I  
give only pertain to the Gimp.


Regards,
- Robert
http://www.cwelug.org/downloads
Help others get OpenSource software.  Distribute FLOSS
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Re: [Gimp-user] blue + yellow = green

2006-02-27 Thread Manish Singh
On Mon, Feb 27, 2006 at 10:19:46PM -0600, Robert Citek wrote:
 
 Hello Carol,
 
 On Feb 25, 2006, at 12:18 PM, Carol Spears wrote:
 first thing.  in keeping with the spirit of how gimpshop came to be, i
 am curious if there are separate online resources for this  
 application.
 they opted (probably for really good reasons) to go on their own to
 provide software for what is probably a large group of users.
 
 perhaps you could list gimpshop resources here so that the gimp users
 can redirect the gimpshop questions to the proper place.
 
 personally, i do not want to interfer with them.  they filled a nitch
 and did this without the gimp developers.  i suspect they had really
 good reasons to do this.  it would be wrong, in my opinion, to  
 start to
 help them now -- keeping with the spirit of their project.
 
 From your writing tone, I sense a bit of a rift between Gimp and  
 Gimpshop.  I find that odd given that I did not sense it at the  
 Gimpshop site.  While there I heard nothing but praise and references  
 back to Gimp.org, but admittedly I didn't set out to find animosity.

The guy who did Gimpshop decided to do his own thing, and didn't consult
the community at all before doing it. Since he didn't engage the
community and those who actually know the code best, he did it in a
completely stupid fashion technically. He forked the code.

Completely ignoring the developers and the community to begin with
generates a fair amount of animosity.

 From what I have read, Gimpshop is the Gimp with a skin to make it  
 a bit more like Photoshop.  From using it myself I would have to say  
 that is a fair assessment.  No question, Gimpshop is not Photoshop,  
 nor did I expect it to be.  I expected it to be the Gimp with a  
 twist, which, as far as I can tell, it is.

Nope. It's not a skin. It's a code fork. It could have been a skin,
but either the Gimpshop guy didn't know how (and didn't bother to ask),
or he maliciously decided to make a name for himself on the work of
others, with doing very little work himself. Oh, and on top of that, beg
for money.

 As for providing help, that is entirely a personal choice.  If you  
 feel that by helping me you are helping them over at Gimpshop and you  
 feel strongly about not helping them over at Gimpshop for whatever  
 reason, then do not help me.  That's OK.  To me image manipulation is  
 just a hobby.  It's fun.  It's challenging.  It's something new for  
 me to learn.  It's something for me to show my family and friends.  I  
 enjoy Open Source for the same reasons.  It's fun.  It's  
 challenging.  It's a way to develop a community of users and friends.

Except Gimpshop divides this community. So by supporting it, you're
contributing to making the community not fun for other users and
friends. Is that what you want to do?

How about instead of promoting a someone who doesn't understand how free
software works, and doesn't actually understand what he's doing
technically, actually work with people who know what they're doing to
see something you desire? The idea of a photoshop skin isn't a bad one,
but the way Gimpshop went about was absolutely horrible.

-Yosh
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Re: [Gimp-user] blue + yellow = green

2006-02-27 Thread Carol Spears
On Mon, Feb 27, 2006 at 10:19:46PM -0600, Robert Citek wrote:
 On Feb 25, 2006, at 12:18 PM, Carol Spears wrote:
 first thing.  in keeping with the spirit of how gimpshop came to be, i
 am curious if there are separate online resources for this  
 application.
 they opted (probably for really good reasons) to go on their own to
 provide software for what is probably a large group of users.
 
 perhaps you could list gimpshop resources here so that the gimp users
 can redirect the gimpshop questions to the proper place.
 
 personally, i do not want to interfer with them.  they filled a nitch
 and did this without the gimp developers.  i suspect they had really
 good reasons to do this.  it would be wrong, in my opinion, to  
 start to
 help them now -- keeping with the spirit of their project.
 
 From your writing tone, I sense a bit of a rift between Gimp and  
 Gimpshop.  I find that odd given that I did not sense it at the  
 Gimpshop site.  While there I heard nothing but praise and references  
 back to Gimp.org, but admittedly I didn't set out to find animosity.
 
i am sorry if my tone suggested this.  if i start a project like
gimpshop on my own and wanted the help of the gimp developers, i would
probably talk to them about how to go about having this project.  it is
part of what i think working together is.  perhaps it is that i have
expanded the definition too much for todays standards.  going on with
this idea though, if i started a project without seeing how to work with
the existing developers, probably i would continue to not want them to
intervene.  especially, if i had modified the sources in such an
unmaintainable way.

i borrowed your car and i gave it an automatic tranmission for you,
don't worry about thanking me!

please, do not do that to my car.  i am not going to do this to your
car--and, you do not have to thank me for that.

please, read my comments with the tone of respect for the way the
gimpshop development team has opted to work.

 From what I have read, Gimpshop is the Gimp with a skin to make it  
 a bit more like Photoshop.  From using it myself I would have to say  
 that is a fair assessment.  No question, Gimpshop is not Photoshop,  
 nor did I expect it to be.  I expected it to be the Gimp with a  
 twist, which, as far as I can tell, it is.
 
i think you read wrongly, however, i read different things and perhaps i
read the wrong information.

i am personally against making gimp look like photoshop at all.  i speak
for myself however.  some of the gimp developers are now involved with
all these crazy usability forums where everyone is a usability expert
and lord knows, i really speak for myself now.

reasons i have to be against letting gimp look anything like photoshop
are mostly involving personal experiences where the gimp user can show
the photoshop user how to make it work and not the other way around.

even when i accidentally chose two splash made by photoshop:
http://ircd.gimp.org/~carol/splash/river/
http://ircd.gimp.org/~carol/splash/sun2/
i saw words used that would be in my opinion a real problem to
translate.  the word pond for instance, to describe ripple size.  in
gimp, a similar tutorial would suggest the value or number for the
similar gimp plug-in.  the numeric value is much more translateable and
ultimately understandable.  gimp is a learning tool and more and more
designed for ease in translation.  

all of the converted photoshop users of gimp who refuse to get it
without the photoshop spoon attest to gimps success in what it does.

personally, i would be disinterested in making it easier for photoshop
users unless i could make some money from it.

 For me Gimpshop is a way for me to introduce the Gimp to other  
 volunteers that I work with at a local non-profit.   We take in old  
 computers, refurbish them, use them to teach under-served kids in  
 grades 4-8 how to use computers, and then give the computers to the  
 students at the end of the session which last about 8 weeks.  The non- 
 profit already has a tremendous amount of material for teaching  
 Photoshop (my guess would be some pared-down version).  Plus  
 Photoshop is something the existing volunteers are very familiar  
 with.  However, because of technical, legal, and financial  
 constraints, we have decided to migrate to using and teaching Open  
 Source.  The Gimp seems to be a natural choices for image  
 manipulation, with the Gimpshop providing a smooth migration path  
 given our existing Photoshop infrastructure.  Sure, eventually we'll  
 migrate completely to the Gimp.  But for now, it's baby steps.
 
half a step is silly.

baby steps are really not useful.

you do not teach open source unless you also teach how to work with
developers if there is problems with understanding.

call this a baby step in sorry the gimpshop web site has not enough
bandwidth, please contribute to that team so you can continue to take
your baby steps.

if there is not a smooth translation of use 

Re: [Gimp-user] blue + yellow = green

2006-02-27 Thread Carol Spears
On Mon, Feb 27, 2006 at 09:01:30PM -0800, Carol Spears wrote:
  
 gimp (the way it was made) is a much better way to learn image
 manipulation.  one more time, if changing from photoshop to gimp is a
 problem and changing from gimp to photoshop is a problem -- wherein are
 the gimp design problems?
 
this sentence makes no sense, sorry.  allow me to fix it:

gimp (the way it was made) is a much better way to learn image
manipulation.  one more time, if changing from photoshop to gimp is a
problem and changing from gimp to photoshop is not a problem -- 
wherein are the gimp design problems?

sorry.

carol

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Re: [Gimp-user] blue + yellow = green

2006-02-25 Thread Akkana Peck
Robert Citek writes:
 I'm slowing getting familiar with gimp/gimpshop.  And so I thought I  
 would try a couple of toy problems.  One toy problem is to create a  
 venn diagram.  The resulting image would look something like a Visa  
 logo, except the colors of the circles would be blue and yellow, with  
 the intersection being green. 

Using layer modes, you can get an effect similar to what you're
describing: you can make overlapping areas of layers turn
colors that reflect the addition or subtraction of the two colors.
Unfortunately, blue and yellow don't combine to make green in either
addition or subtraction mode; they make white. Think about the RGB
values of the colors to understand why -- if you don't know the RGB
values of colors off the top of your head, watch the sliders in the
color chooser dialog when you select the colors to see how red,
green and blue combine to make each color. Blue is 00F, yellow is
FF0, and adding them makes white, FFF, instead of green, 0F0.

To get a better feel for how colors combine, try this exercise:
make a black background layer. On top of it, make three circles,
each in its own layer, one colored red, one green, and one blue.
Move the circles so that they overlap each other partially but not
completely. Now, in the Layers dialog, set each of the three circles
to Addition mode and watch how they combine. Play with circles of
different colors in different layer modes to see what happens.

 To clarify, I'm not looking to select the intersection based on color  
 and then fill the selection with green, but rather have gimp/gimpshop  
 imitate what one would do in the real world with color filters, e.g.  
 acetate[3], and a white light.

Subtract mode does basically what colored filters would do to a
white light (do the circles exercise I described, but start with a
white background instead of black). Addition mode is what you would
see if you shone lights of different colors (e.g. a blue light and
a yellow light) onto the same surface. Unfortunately, in neither
mode will blue and yellow combine to make green, even though that
is the combination you'd expect if you're used to mixing paints.

...Akkana
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