Re: [Gimp-user] Error in opening psd files

2016-09-24 Thread Alexandre Prokoudine
24 сент. 2016 г. 0:37 пользователь "Steve Kinney" написал:

> The GIMP includes a filter that converts the visible image to CMYK
> layers, and the result can be exported as a CMYK TIFF file.

Only if one installs a 3rd party plugin called separate+.

Alex
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[Gimp-user] Error in opening psd files

2016-09-24 Thread enzoorsi
>No longer have a copy of Photoshop—I just remember the manual talking
>about it, and that they seemed to have several different color
>standards available.
>
>Sorry my memory of it is no better. It was at least two decades ago
>that I last had to deal much with different color standards. Steve
>Kinney posted that PS uses LAB, which fits my memories, but I seem to
>recall there were one or two others available, at least for printing.
>
>And regardless of whether you use RGB or LAB, printing will be CYMK.
>IIRC (and I may not) LAB is closer to CYMK.
>
>Ross

Hi,
but in GIMP how is possible to export in CYMK before printing?

Thank you!!

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Re: [Gimp-user] Error in opening psd files

2016-09-23 Thread Steve Kinney
On 09/23/2016 11:57 AM, Ross Martinek wrote:

> Thanks for jogging my memory. I think what I was thinking is that Adobe had 
> color palettes based on those catalogs, intended to produce printed colors 
> that matched the catalog. Like I said, it’s been a long time.

Those catalogs would be Pantone ones.  They are usually most relevant
when printing vector graphics, i.e. silk screen or offset printing.
Printer's inks have Pantone values printed on their labels, and very
precisely match the color chips on Pantone reference cards.  I have seen
"Pantone to HTML color" charts on the network, and they are better than
nothing but far from precise.  "HTML color" means hexadecimal RGB, which
is also the GIMP's native color model.

RGB stands for Red, Green and Blue.  It is an "additive" color model,
applicable to mixing colored light sources.  Example:  TV screens and
computer monitors.

LAB stands for Luminance, Red/Green, Blue/Yellow.  It is based on
studies of human color perception and is more or less universal, but no
monitor or printer can duplicate this color space directly - it has to
be exported to RGB (monitor) or CMYK (printer) for display.

CMYK stands for Cyan, Magenta, Yellow and Black.  It is a "subtractive"
color model, applicable to mixing ink or paint colors to control the
color of reflected light.

When people start talking about computer programs that can "natively
edit in CMYK", try not to groan:  The only way to edit images in CMYK is
with a paintbrush or comparable tool, because on a monitor you see the
image in RGB no matter what format the program is reading from and
writing to.

An RGB image can be exported to or imported from a file with CMYK data,
via a filter based on the intersection of RGB and CMYK values in LAB
color space.  But "what you see" on the monitor is not exactly "what you
get" on the printed page.  Upcoming versions of the GIMP with GEGL under
the hood will support /much/ higher resolution RGB color, improving the
potential color match between screen and paper versions of a given
image.  (GIMP layers can also include an Alpha channel for transparency;
hence "RGBA" values.)

In recent times I have had no problems with color management for print;
PNG files imported to Scribus and saved as PDF come out looking like I
want them to when printed.  A decade ago, this was not always the case.
I believe that LCD monitors and improvements in color conversion
algorithms probably account for this.

To get the best available color rendering, first check your monitor.  If
a color profile is available from the manufacturer, get it and install
it on your workstation machine, and make sure the GIMP knows about it:
Edit > Preferences > Color Management.  This will tweak your video
output for "best results."  An alternative to this is to glovally
disable color management and tweak your monitor by hand, see:

http://www.lagom.nl/lcd-test/

Color perception is also a factor:  The more neutral gray you see around
an image, the less your eye and brain will distort the colors in the
image.  Conversely, if you know that a bunch of images you are working
on will be displayed on a colored background - say a web page or
brochure - you can set the Canvas Padding color in the GIMP to that
color, and see your images in progress in their native color context:
Edit > Preferences > Image Windows > Appearance.

The GIMP includes a filter that converts the visible image to CMYK
layers, and the result can be exported as a CMYK TIFF file.  This may
facilitate color adjustment at the print shop, and any commercial
printers who still demand "Adobe Formats Only, or take your filthy money
elsewhere!" will usually accept CMYK TIFF files without complaint.

Color printing used to be a bit of a major nuisance, but lately not so
much - depending the use case, your mileage may vary.  The remaining
problem is color resolution:  If you have a big, subtle gradient you
have to get just exactly right, you are going to see banding on your
monitor and in the printed results.  The upcoming GEGL based GIMP color
model, with resolutions up to 64 bit floating point, should put a stop
to that nonsense.

:o)



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Re: [Gimp-user] Error in opening psd files

2016-09-23 Thread Ross Martinek
Thanks for jogging my memory. I think what I was thinking is that Adobe had 
color palettes based on those catalogs, intended to produce printed colors that 
matched the catalog. Like I said, it’s been a long time.

Ross


> On Sep 23, 2016, at 10:21 AM, Alexandre Prokoudine 
>  wrote:
> 
> On Fri, Sep 23, 2016 at 5:56 PM, Ross Martinek wrote:
> 
>> Sorry my memory of it is no better. It was at least two decades ago
>> that I last had to deal much with different color standards. Steve Kinney
>> posted that PS uses LAB, which fits my memories, but I seem to recall
>> there were one or two others available, at least for printing.
> 
> You were probably referring to Pantone and Hexachrome. None of those
> spot color catalogs are related to Adobe. None of them are color
> models :)
> 
> Alex
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Re: [Gimp-user] Error in opening psd files

2016-09-23 Thread Alexandre Prokoudine
On Fri, Sep 23, 2016 at 5:56 PM, Ross Martinek wrote:

> Sorry my memory of it is no better. It was at least two decades ago
> that I last had to deal much with different color standards. Steve Kinney
> posted that PS uses LAB, which fits my memories, but I seem to recall
> there were one or two others available, at least for printing.

You were probably referring to Pantone and Hexachrome. None of those
spot color catalogs are related to Adobe. None of them are color
models :)

Alex
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Re: [Gimp-user] Error in opening psd files

2016-09-23 Thread Ross Martinek
No longer have a copy of Photoshop—I just remember the manual talking about it, 
and that they seemed to have several different color standards available.

Sorry my memory of it is no better. It was at least two decades ago that I last 
had to deal much with different color standards. Steve Kinney posted that PS 
uses LAB, which fits my memories, but I seem to recall there were one or two 
others available, at least for printing.

And regardless of whether you use RGB or LAB, printing will be CYMK. IIRC (and 
I may not) LAB is closer to CYMK.

Ross


> On Sep 23, 2016, at 4:03 AM, Alexandre Prokoudine 
>  wrote:
> 
> On Wed, Sep 21, 2016 at 2:01 AM, Ross Martinek wrote:
>> PS has a number of different color standards (some Adobe’s proprietary 
>> materials)
> 
> Any examples?
> 
> Alex
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Re: [Gimp-user] Error in opening psd files

2016-09-23 Thread Partha Bagchi
On Fri, Sep 23, 2016 at 5:03 AM, Alexandre Prokoudine <
alexandre.prokoud...@gmail.com> wrote:

> On Wed, Sep 21, 2016 at 2:01 AM, Ross Martinek wrote:
> > PS has a number of different color standards (some Adobe’s proprietary
> materials)
>
> Any examples?
>
> Alex
>
> What's a color standard? Do you mean ICC profiles? What's proprietary
material here?
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Re: [Gimp-user] Error in opening psd files

2016-09-23 Thread Alexandre Prokoudine
On Wed, Sep 21, 2016 at 2:01 AM, Ross Martinek wrote:
> PS has a number of different color standards (some Adobe’s proprietary 
> materials)

Any examples?

Alex
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Re: [Gimp-user] Error in opening psd files

2016-09-22 Thread Steve Kinney


On 09/19/2016 04:48 PM, enzoorsi wrote:

> But now in GIMP the colors seem different from Photoshop when I am exporting 
> in
> PNG/JPEG :(
> 

The GIMP and Photoshop use different color models:  RBG in the GIMP and
LAB (if I recall correctly) in Photoshop.  Color conversions between the
two will be, at best, approximate.

:o/

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Re: [Gimp-user] Error in opening psd files

2016-09-20 Thread Ross Martinek
PS has a number of different color standards (some Adobe’s proprietary 
materials)  that it can use in addition to the standard variations of HSI, RGB, 
and CYMK. I’m not sure how GIMP handles this, as it hasn’t come up in what I’m 
doing. When you export the files from PSD, make sure you are using a color 
space that is supported by GIMP.

Ross


> On Sep 19, 2016, at 3:48 PM, enzoorsi  wrote:
> 
>> I think the clipping mask is the problem. Can you go back into PS and
>> remove the clipping mask in the original file? That might solve the
>> problem.
>> 
>> Other than that, I’m at a loss. Hopefully one of the real gurus will
>> chime in on this.
>> 
>> Ross
> 
> Thank you very much!! It worked!!
> 
> But now in GIMP the colors seem different from Photoshop when I am exporting 
> in
> PNG/JPEG :(
> 
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[Gimp-user] Error in opening psd files

2016-09-20 Thread enzoorsi
>I think the clipping mask is the problem. Can you go back into PS and
>remove the clipping mask in the original file? That might solve the
>problem.
>
>Other than that, I’m at a loss. Hopefully one of the real gurus will
>chime in on this.
>
>Ross

Thank you very much!! It worked!!

But now in GIMP the colors seem different from Photoshop when I am exporting in
PNG/JPEG :(

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Re: [Gimp-user] Error in opening psd files

2016-09-19 Thread Ross Martinek
I think the clipping mask is the problem. Can you go back into PS and remove 
the clipping mask in the original file? That might solve the problem.

Other than that, I’m at a loss. Hopefully one of the real gurus will chime in 
on this.

Ross


> On Sep 19, 2016, at 3:29 AM, enzoorsi  wrote:
> 
>> Did you use the “Open as layers” command? GIMP will open a psd file
>> with the simple “Open” command but this may result in the error
>> message you get.
>> 
>> I had a similar problem when converting from PS to GIMP, but I seem to
>> recall using this command solved it.
>> 
>> Ross
> 
> Unfortunately even with "Open layers" I get that error :(
> The file has been produced with Photoshop, I can open with Gimp but layers are
> wrongly shown.
> I saw that the problem is with those layers on which in Photoshop has been
> created a "clipping mask"...
> Any idea? :(
> 
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[Gimp-user] Error in opening psd files

2016-09-19 Thread enzoorsi
>Unfortunately even with "Open layers" I get that error :(
>The file has been produced with Photoshop, I can open with Gimp but
>layers are wrongly shown.
>I saw that the problem is with those layers on which in Photoshop has
>been created a "clipping mask"...
>Any idea? :(

Another (even worse) problem: PSD colors seems different from the same file
opened in Photoshop and in GIMP...
Any idea?? :O

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[Gimp-user] Error in opening psd files

2016-09-19 Thread enzoorsi
>Did you use the “Open as layers” command? GIMP will open a psd file
>with the simple “Open” command but this may result in the error
>message you get.
>
>I had a similar problem when converting from PS to GIMP, but I seem to
>recall using this command solved it.
>
>Ross

Unfortunately even with "Open layers" I get that error :(
The file has been produced with Photoshop, I can open with Gimp but layers are
wrongly shown.
I saw that the problem is with those layers on which in Photoshop has been
created a "clipping mask"...
Any idea? :(

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Re: [Gimp-user] Error in opening psd files

2016-09-18 Thread Ross Martinek
Did you use the “Open as layers” command? GIMP will open a psd file with the 
simple “Open” command but this may result in the error message you get.

I had a similar problem when converting from PS to GIMP, but I seem to recall 
using this command solved it.

Ross


> On Sep 18, 2016, at 4:20 PM, enzoorsi  wrote:
> 
>> Hi,
>> Sorry if the topic is obvious but i could not find any answer:
>> On opening psd files with gimp, i always get the error "the layer mask
>> is partly outside the layer boundary.The mask Will be cropped which
>> may in data loss." , which results in losing one or several layers. Is
>> there a way to fix this ?
> 
> Hi,
> I am having the same trouble...no idea how to open it properly in GIMP due to
> this error :(
> Did you solve it somehow?
> 
> Thank you!!
> 
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[Gimp-user] Error in opening psd files

2016-09-18 Thread enzoorsi
>Hi,
>Sorry if the topic is obvious but i could not find any answer:
>On opening psd files with gimp, i always get the error "the layer mask
>is partly outside the layer boundary.The mask Will be cropped which
>may in data loss." , which results in losing one or several layers. Is
>there a way to fix this ?

Hi,
I am having the same trouble...no idea how to open it properly in GIMP due to
this error :(
Did you solve it somehow?

Thank you!!

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[Gimp-user] Error in opening psd files

2016-05-23 Thread Ender
Hi,
Sorry if the topic is obvious but i could not find any answer:
On opening psd files with gimp, i always get the error "the layer mask is partly
outside the layer boundary.The mask Will be cropped which may in data loss." ,
which results in losing one or several layers. Is there a way to fix this ?

-- 
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