Re: [Gimp-user] miror image

2006-12-17 Thread Marco Wessel


On Dec 17, 2006, at 8:12 PM, Alexis Everson wrote:


Can anyone tell me please if there is an
opton to mirror an image rather than just
flipping it.

I want to put a graphic on the other side of a
banner and flipping it makes the letters backwards.
A mirror image would make them the right way
around after flipping.



I'm not entirely sure what you mean, but a flip and a mirror are  
exactly the same. To demonstrate, write something on a piece of  
paper, stand in front of a mirror and look at the piece of paper  
while you hold it up. This is the mirror, obviously. Now flip the  
piece of paper and hold it up against the light. Same thing.



Regards,

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Re: [Gimp-user] miror image

2006-12-17 Thread Marco Wessel

On Dec 17, 2006, at 8:36 PM, norman wrote:


 Sorry, but I must disagree. If I look into a mirror my right side is
 still on the right. If I could flip, then my right side would be on  
 the
 left.

Uh, no. Think of that person in the mirror as someone else for a bit  
and forget the mirror is even there. If you were raising your right  
hand, then that person would be raising his left hand. Maybe it'd be  
even clearer if you stood across from someone and both raised your  
right hands. You'd find the other person's hand would be on your left  
side. Mirrors flip left and right. Always have, always will.  Any  
text held up to a mirror would come out the same was as were it  
flipped. Take a flipped image, hold it up to a mirror and you can see  
what the image was like before the flipping.
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Re: [Gimp-user] Is this compatible?

2006-10-08 Thread Marco Wessel


On Oct 8, 2006, at 5:21 PM, Jozef Legeny wrote:



PNG supports indexed and grayscale color modes which aren't lossless,
however by default the PNG is entirely lossless


That is a bit of a weird definition of lossless. If you save an RGB32  
image as an indexed or grayscale PNG then yes, you've lost  
information. But that is inherent to grayscale and indexed images.  
You should have saved that as an RGB32 image, which PNG fully  
supports. In this case it isn't PNG throwing data away (like JPEG  
does), but the image editor (GIMP) converting to indexed/grayscale  
and then saving that. Indexed and grayscale modes in PNG are just as  
lossless as its non-indexed modes.


However like I said there are methods of tuning the PNG's compression  
to be lossy, and yet still be PNG-compatible. No image editors that I  
know of implement these methods, however. (http://membled.com/work/ 
apps/lossy_png/).


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Re: [Gimp-user] Is this compatible?

2006-10-07 Thread Marco Wessel


On Oct 7, 2006, at 7:25 PM, Chris Mohler wrote:


Apologies - forgot to reply-all

My advice would be to save your files in TIFF format.  If you enable
LZW compression, the file size will be significantly reduced without
losing quality (unlike JPEG, and to some degree PNG).


PNG is just as lossless as TIFF with LZW compression. There are ways  
of lossily compressing PNGs but they are non-standard and GIMP does  
not implement them as far as I know.


Either will suffice in this case as photoshop reads both, though its  
support for PNG in certain situations (mostly having to do with 16  
bits per channel images) is sub-par.



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Re: [Gimp-user] How to draw a line? :(

2006-05-12 Thread Marco Wessel

Did you read the actual straight line tutorial? It's here:

http://www.gimp.org/tutorials/Straight_Line/

It details exactly what to do, step-by-step.


Marco


On May 12, 2006, at 9:02 PM, Simon Roberts wrote:


I'm feeling particularly useless today, I'm pretty much a total
beginner with GIMP, but I can't believe this is as hard as I seem  
to be

making it.

I want to draw a straight line. I'm using Gimp 2.2.4

I try the paintbrush, I have a color selected, and I can draw a
squiggly line. The help says that holding shift down will make all
these tools constrained to straight lines, but mine doensn't draw
anything. It looks like it's trying to do measuement or something.

I try the path tool (which I can't claim to understand) and then  
try to

stroke the path. I get polygons while I'm messing about, I can also
get curves, but I don't seem to be able to get an actual line that
stays on the page.

What I _want_ is a straight line, constrained to horizontal or
vertical, drawn with the caligraphic brush (so it has a chiselled end)
and using the fade out option, so it disappears smoothly over a
distance.

Anyone want to tell me what's so obvious that I've missed it?

Thanks in advance,
Simon


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Re: [Gimp-user] transparity

2004-11-21 Thread Marco Wessel
On Mon, Nov 22, 2004 at 03:51:49AM +0100, Gert Cuykens wrote:
 hi i want to make the background transparent, when i add the alpha
 thingie and save the picture as png IE show some kind of blue stuff as
 background ?


Internet Explorer doesn't support PNG Alpha channels by itself. There
are hacks to make it work, though. Google for IE PNG Alpha Hack. 
It does support 1-bit (GIF-like) transparency, though.

Marco
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Re: [Gimp-user] renaming the gimp

2004-11-07 Thread Marco Wessel
On Mon, Nov 08, 2004 at 09:39:32AM +1100, Owen Cook wrote:
 
 On Sun, 7 Nov 2004, Gezim Hoxha wrote:
 
  
  P.S: I know GIMP is an acronym, but [almost] no one
  calls it GNU Image Manipulation Program either.
 
 
 Corrupt the acronym ..the Great Image Manipulation Program
 
 and if you didn't do an install-strip, you might want to call it the 
 Bloody Large Image Manipulation Progam or BLIMP for short
 


Or for the Chinese market: The Government Image Censoring Application,
or the GICA.

---

No, The GIMP does not need a namechange. I don't think filmgimp, now
cinepaint, got any more popular when it changed names.

Marco
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Re: [Gimp-user] Making an image with a white background transparent?

2004-05-09 Thread Marco Wessel
On Sun, May 09, 2004 at 12:57:59PM -0700, dreadnought wrote:

 The tutorial mentions painting underneath the image to
 replace the white that should be part of the graphic, but doesn't go
 into how to do this?

You can either select the region you don't want included, invert it, and
then apply colour to alpha (thus excluding the white parts of the
graphic), or you can create a new layer under the layer with your
graphic and paint white into that.

Marco
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Re: [Gimp-user] make white the transparent color

2004-04-30 Thread Marco Wessel
On Fri, Apr 30, 2004 at 03:51:26PM +0200, Joachim Schiele wrote:
 
 is there a posibility to change the wite color tone, or any other specified by 
 me to the alpha-color? i got a picture with a white background, now change 
 the white to transparent.
 
 thanks in advice ;-)
 joachim
 

Yes, the Color to Alpha plug-in. Comes with GIMP. You can find it at
image/Filter/Colors/Color to Alpha.

Marco
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Re: [Gimp-user] Virus alert

2004-04-30 Thread Marco Wessel
On Fri, Apr 30, 2004 at 01:26:59PM -0600, Norma Carlson wrote:
 I just received a virus infected email from the Gimp-user list.  My ISP mail 
 protection program caught it and quarantined it so no damage was done.  Just wanted 
 to give all a heads up.

No, this was a virus that set the gimp list as its sender address. I
have no scanners whatsoever, and got no such e-mail.

There is no need to notify this list (or any other list, in fact) of
viruses. In fact, most of us probably don't even use Windows.

Marco
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Re: [Gimp-user] printing

2003-12-21 Thread Marco Wessel
On Sun, Dec 21, 2003 at 04:47:35PM -0200, Josenildo Marques wrote:
 When I try to print with The Gimp I have to choose my printer as the
 output. If I leave the output as PostScript Level 2, all it prints is
 unreadable gibberish on many sheets of paper.
 How can I solve this ?

Your printer can't handle PostScript. You'll need to select your printer
model or a compatible one from the list.

Marco
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Re: [Gimp-user] printing

2003-12-21 Thread Marco Wessel
On Sun, Dec 21, 2003 at 08:16:47PM -0200, Josenildo Marques wrote:
 
 Thanks, again, Marco.
 It's an Epson Styllus Colour 580.
 I am wondering if there is a way to save this setting so that I won't
 need to do that every time I want to print something.
 

I'm fairly sure it can. I can't tell you how though -- I don't need to
print from GIMP, and if I would, I have a postscript-capable printer ;)

Marco
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Re: [Gimp-user] targa image

2003-12-19 Thread Marco Wessel
On Fri, Dec 19, 2003 at 08:31:51AM -0200, Josenildo Marques wrote:
 Hi.
 I have created some trees with Arbaro  Povray, but I cannot open them
 in The Gimp. It says the files are corrupted.
 Here is one example:
 $ file arbaro/pov/ca_black_oak.png
 arbaro/pov/ca_black_oak.png: Targa image data - RGB 400 x 600

Try renaming them to file.tga or selecting TGA from the 'determine
filetype' dropdown menu in the file selector.

Marco
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Re: [Gimp-user] png

2003-12-08 Thread Marco Wessel
On Mon, Dec 08, 2003 at 04:43:43PM -0500, Bob Lockie wrote:
 KSnapshot: 34 108 bytes, 585x385, 24bbp, RGB, deflate.
 Gimp: 78 896 bytes, 400x263, 24bbp, RGB, deflate, compression 9.
 
 There are no options in KSnapshot so I don't know what the compression 
 level is (can it be higher than the highest in Gimp=9?).

I think 9 is the highest possible in zlib.

Anyway, if no one has said it yet, this is most probably caused by you
scaling the image with resampling turned on. This makes images less easy
to compress when using the types of compression that PNG and such use. 

How about you put the images online somewhere so we can be sure of this?

Marco

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Re: [Gimp-user] png

2003-12-08 Thread Marco Wessel
On Mon, Dec 08, 2003 at 06:13:47PM -0500, Bob Lockie wrote:
 
 The pics are on the web at:
 
 http://www.lockie.ca/test/ksnapshot.png
 http://www.lockie.ca/test/gimp.png

Ugh, KDE is ugly.. *ducks*

Anyway, this is exactly what I said. When you rescaled the image you
made it harder to compress because of the resampling. Therefore the 
filesize is higher.

Someone more of an expert in compression methods can tell you more about
this, I don't dare get into it too deeply.

Marco
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Re: [Gimp-user] Where's Wilber gone ?

2003-11-18 Thread Marco Wessel
On Tue, Nov 18, 2003 at 09:38:36PM +0100, Jina wrote:
 The small icon shown near the URL in my browser when visiting www.gimp.org is 
 no more showing the smily face of Wilber, but a sort of... something ! what's 
 that ? 
 
 RELEASE WILBER !!!

It's still wilber here...

Maybe you have a caching problem of some sorts?

Marco
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Re: [Gimp-user] What happened to transparency after flatten?

2003-10-13 Thread Marco Wessel
On Mon, Oct 13, 2003 at 11:06:09AM -0500, Kevin Myers wrote:
 Hi Marco -
 
 I've been working with some facets of digital images for a long time, but I
 still don't completely understand everything about transparency.  In
 particular, you mention one of the things here that I am confused about.
 Could you please explain further exactly what transparency and alpha
 channels have to do with each other? 

First off -- unless you mean you want to see through parts of an image
entirely, you mean translucency. Transparent - invisible; translucent
- see-through.

The alpha channel is basically a channel just like red, green, and blue,
except that it determines the translucency of the pixel, instead of the
colour. 

 what does that have to do with alpha? 

I have no clue why they called it an alpha channel, if that's what you
mean.

 Also, how is level of transparency actually
 applied in order compute the final display values for a pixel when a
 semi-transparent pixel is overlaid onto an underlying non-transparent pixel?

While typing this email, I see sven has answered this.

 Although the original question in this thread involved png files, I am more
 interested in tiff files, but I suspect that essentially the same answer
 applies to both.  Thanks!
 

Both support alpha channels, yes.


Marco
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[Gimp-user] Re: [Gimp-developer] makes it sense to add native CMYK support toGIMP?

2003-06-08 Thread Marco Wessel

On Sun, 8 Jun 2003, Helvetix Victorinox wrote:

 This may be entirely my deficiency, but I am unclear on the general
 usefulness of having a native CMYK implementation.  On one hand I
 understand that there is a perceived value of working with the four
 values, on the other hand I think we expose too much of the underlying
 guts of the colour implemetation and gamuts to the poor user already.

 [snip]

 A contribution here would be the development of a good colour abstraction
 interface.  Let the user choose things like if the image is a COLOR image
 or a Black and White image (GRAY), with or without transparency.  None of
 this business of values like 255 (white in 8bit rgb).  Naturally there
 will be people who want access to the underlying knobs and switches,
 and that's okay. But we ought to at least put a cover over it.

 I think CMYK ought to be a Save As option (as appropriate).

 Helvetix


I disagree. I hate it when software shields away the more advanced
features. It is adjusting to the user, while the user should be adjusting
to software instead. More than that, it's not adjusting to the correct
user.

Marco Wessel

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Re: [Gimp-user] [Q] Resizing a PNG makes it BIGGER!

2003-06-05 Thread Marco Wessel

My guess is that this is because of the interpolation when resampling.
Makes it less easily compressable. (Notice the 'anti-aliased' edges in
the resized picture?)

Marco Wessel



On Wed, 4 Jun 2003, Daniel Carrera wrote:

 Hi,

 This is really weird.  I have a PNG image.  I tried to make it smaller by
 resizing it down, but instead it got BIGGER.  I don't understand this at
 all.

 I put the images on the web:

 Original:  http://www.math.umd.edu/~dcarrera/screenshot.png
 Resized:   http://www.math.umd.edu/~dcarrera/screenshot_resized.png

 With width and height of the resized image are 0.8 times the size of the
 original, so I would have imagined that the resized image would be
 0.8*0.8 = 0.64 times the size of the original, but that's not the case:

 $ du -sk *
 52  screenshot.png
 128 screenshot_resized.png

 The new image is over 4 times bigger than the original!

 These are RGB images BTW, but that shouldn't cause this.

 Does anyone know what's happening?


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Re: [Gimp-user] Install on Solaris 8

2002-01-24 Thread Marco Wessel

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

You need to recompile The GIMP with the libpng before it can open
pngs. 
 
Marco


On Thu, 24 Jan 2002, Jim Clark wrote:

 Downloaded successfully, compiled successfully, and working fine. Except
 cannot open a png. Search, found the pnglib for Solaris. Downloaded and
 added the png library, went in properly to /usr/local/lib. But GIMP
 still cannot open a png. Can anyone offer a why not?
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Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

iD8DBQE8UEnnwv7F35N3gLoRAiudAJkBLwyPCWAIBi78VPyaRfp0tiZNZQCeL8PQ
qtlQb/LxVRhA7ebc84GUtp8=
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