[argyllcms] Re: "Development in progress" update

-------- Original-Nachricht --------
Datum: Thu, 13 Jul 2006 12:26:13 +1000
Von: Graeme Gill <graeme@xxxxxxxxxxxxx>
An: argyllcms@xxxxxxxxxxxxx
Betreff: [argyllcms] Re: "Development in progress" update

> Gerhard Fuernkranz wrote:
> 
> > The same problem seems to happen with Adobe RGB as source color space 
> > too. And Adobe RGB is IMO not an unusual profile.
> 
> Hmm. Some people have commented to me that they think that Adobe RGB has
> a ridiculous green too. One story I've heard is that Adobe RGB was
> an accident, a cut and paste error when someone tried to create
> a Rec. 709 set of primaries starting with the old NTSC 1953,
> and forgot to edit the green. Rather than change the colorspace, Adobe
> just re-christened it. Hard to know if that is really what happened,
> although the numbers match the story.

But if it would use the Rec.709 primaries, what would be the significant 
difference to sRGB? Then it would not be a color space with a wider gamut than 
sRGB.

> This particular error was to do with creating the Colorant Tag (New
> in this release of Argyll). In a device profile there will be one,
> and the PCS values of each colorant will be in the PCS of the profile,
> which could be XYZ. For device links there are two colorant
> tags, one for the source colorspace, and one for the destination.
> Since a device link doesn't have a PCS to follow, the spec. says
> the colorant values shall be in Lab, hence the XYZ to Lab clipping
> problem.

Btw, is a colorant table tag really necessary for RGB, CMYK, etc.? IMHO it's 
only mandatory in conjunction with xCLR color spaces. Is it actuall specified 
which names and which spelling to use in case of standard spaces like RGB, 
CMYK, ...? ("Red"? or "red"? or "RED"?)

Regards,
Gerhard

-- 
Gerhard Fuernkranz
nospam456@xxxxxx

"Feel free" â 10 GB Mailbox, 100 FreeSMS/Monat ...
Jetzt GMX TopMail testen: http://www.gmx.net/de/go/topmail

Other related posts: