[XeTeX] Color names in XeTeX

[Bruno Voisin]

Le 28 déc. 04, à 01:02, Jonathan Kew a écrit :

> It looks like you can probably work around the issue for now, by 
> saving the JPEG without an embedded color profile, if the original 
> application (or some other utility) gives you this option. But you may 
> lose some of the color accuracy you'd like to have, of course.

Just done that, which had me reading about color more than I ever 
wanted to know:

- Looked at ColorSync Utility help, then 
<http://images.apple.com/pro/pdf/Color_Management_in_Mac_OS_X.pdf>, and 
found an assembly of useful scripts at /Library/Scripts/ColorSync.

- Found out the JPEG file, legi150.jpg, had the embedded profile "sRGB 
IEC61966-2.1", which happens (the JPEG file had been provided by a 
third party --- a graphic designer --- and hadn't been edited by me) to 
also live on my setup as an independent file

	/Library/Application Support/Adobe/Color/Profiles/Recommended/sRGB 
Color Space Profile.icm

- Used "/Library/Scripts/ColorSync/Match to chosen profiles" to prepare 
an alternative version, legi150b.jpg, with profile "Profil sRVB" 
corresponding to

	/System/Library/ColorSync/Profiles/sRGB Profile.icc

- Used "/Library/Scripts/ColorSync/Remove profile from image" to 
prepare a second alternative version, legi150c.jpg, with no profile at 
all.

It's amazing how such little changes impact the output:

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Now XeTeX: only the version legi150c.jpg with no profile at all does 
work with XeTeX. On the other hand, I have the impression it yields 
nicer colors than I was obtaining previously with pdfTeX and the 
original JPEG file legi150.jpg containing a ColorSync profile. What's 
even more surprising, in both cases (pdfTeX with the original JPEG file 
containing a ColorSync profile, XeTeX with the modified JPEG file 
containing no ColorSync profile) the colors of the JPEG logo in the PDF 
output are different from those in the above screenshot, obtained with 
Preview.app.

Bruno