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[Gimp-developer] Thoughts on CMYK, and getting it without implement   Message List  
Reply | Forward Message #14184 of 14186 |
Re: [Gimp-developer] Thoughts on CMYK, and getting it without implementing it.

On Fri, Nov 30, 2001 at 03:38:10AM -0800, Jay Cox <jaycox@...> wrote:
[cmyk comversion]
> Where I work it is a very critical process.

Any tips here? If gimp would support CMYK on-screen, how would the users work
be different? Do users actually adjust CMYK themselves or do they just draw
using predefined CMYK values?

I mean, is the principal problem the missing CMYK colours in RGB, or is
the principal problem the "looks the same on-screen as on print". The
latter could be solved largely outside the gimp (tiff plug-in), the former
obviously not.

> with less compulsive designers it is much less critical. This feature
> would not get gimp into prepress houses, but might help out the casual
> designer who is preparing artwork for a short print run.

Would it be worth it? ;)

> The most common/best way to do trapping that I have seen is to trap
> after the rip using a program like creo/scitex full auto frame (which
> isn't quite as auto as the name implies:).

Obviously, as only then you have the full image. Hey, the new postscript
can do in-rip trapping ;-> (adobe claims yet another revolution ;)

> even if it doesn't have a setting I dont think we should modify the
> default behaviour of gimp to work around a bug in quark :)

well, it depends on wetehr you call this a bug or not. if quark lacks the
functionality (if!) to bind profiles to images it's not a bug ;)

> > 3. (optional, but important) finally enhance the paths to be multipart,
> > contain holes etc. simon? siiiiiiiimoon? ;)
>
> How is #3 optional? :)

Well... it's the most difficult part. 1 and 2 could probably be done even in
gimp-1.2, #3 is a problem. Also, if you don't have clipping paths you still
can print many photos ;)

--
-----==- |
----==-- _ |
---==---(_)__ __ ____ __ Marc Lehmann +--
--==---/ / _ \/ // /\ \/ / pcg@... |e|
-=====/_/_//_/\_,_/ /_/\_\ XX11-RIPE --+
The choice of a GNU generation |
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Fri Nov 30, 2001 6:06 pm

pcg@...
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Message #14184 of 14186 |
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Sorry that it took so long, Simon ;) Anyways, I had some conversation with two graphics designers about CMYK problems and the Gimp at the Systems, and I think...
MarcA.Lehmann
pcg@...
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Nov 27, 2001
2:10 pm

... [observations snipped] Wow! Marc Lehmann has written an email that's actually useful and well-thought out! His "60% CMYK" makes sense to me. Now all I...
Austin Donnelly
austin@...
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Nov 27, 2001
2:21 pm

Hmm .. this is a pretty cool writeup. :) On Tue, Nov 27, 2001 at 03:10:15PM +0100, Marc A. Lehmann wrote: [...] ... [...] ... Can you remember any specific...
Malcolm Tredinnick
malcolm@...
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Nov 27, 2001
2:33 pm

Hi, ... Well, actually this would be true. sRGB is defined using the phosphors standartised for HDTV and used for monitors. And as gimp does no colour ...
Jens Ch. Restemeier
jrestemeier@...
Send Email
Nov 27, 2001
6:51 pm

... Okay, let's write this in other words: sRGB is based on ITU-R BT.709 primaries which are for example standartised for HDTV and should be reasonably close...
Jens Ch. Restemeier
jrestemeier@...
Send Email
Nov 28, 2001
7:18 pm

... CMYK ... worthwhile ... are ... Thanks for writing this stuff up. I think I should mention that I work in the prepress department of a highend...
Jay Cox
jaycox@...
Send Email
Nov 29, 2001
11:18 am

... That's what I was told, too (together with: many people do it with photoshop anyways ;) ... But how critical is that process? Do you think that my main...
MarcA.Lehmann
pcg@...
Send Email
Nov 30, 2001
4:23 am

... Where I work it is a very critical process. At smaller shops that work with less compulsive designers it is much less critical. This feature would not...
Jay Cox
jaycox@...
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Nov 30, 2001
11:38 am

On Fri, Nov 30, 2001 at 03:38:10AM -0800, Jay Cox <jaycox@...> wrote: [cmyk comversion] ... Any tips here? If gimp would support CMYK on-screen, how would...
MarcA.Lehmann
pcg@...
Send Email
Nov 30, 2001
6:06 pm

... You may also want to do it for JPEG - but if you do, consider that Photoshop writes inverted CMYK. ... TIFF can store the clipping path in it's own way,...
Leonard Rosenthol
leonardr@...
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Dec 1, 2001
1:55 pm
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