While in CinePaint I use similiar encodings to TIFFPM6.pdf for 8/16-bit 8
and 9 photometric tags, there is room to improve the float encoding.
The ICC suggested float ranges are oriented on 8-bit math. They are not
very useable for real imagery and may cause a lot of confusion. I would go
as far to say the traditional value range of 0.0 -> 1.0 for RGB should
apply to all colours equally if CIE*Lab, CMYK or RGB.
The CinePaint code is some years old and I did not look at further
specification efforts. So maybe something has allready cleared.
How does photoshop cs2 store floats? I dont have any examples to tell my
own. What is the reference?
regards
Kai-Uwe Behrmann
+ development for color management
+ imaging / panoramas
+ email: [EMAIL PROTECTED]
+ http://www.behrmann.name
Am 20.08.05, 17:04 +0200 schrieb Joris:
> Marti,
>
> Marti wrote:
> > http://www.asmail.be/msg0055212264.html
>
> Seems like only yesterday...
>
> I've not followed this thread closely, and don't know if you guys are
> discussing Photometric 8 or 9, and what bitdepth. To be on the safe
> side, I thought it best to add a link to the specification supplements.
>
> http://partners.adobe.com/public/developer/en/tiff/TIFFPM6.pdf
> This supplement was largely unknown when we did the work concluded in
> http://www.asmail.be/msg0055212264.html. Also, neither the original
> specification, nor this supplement, described the 16bit per channel
> encoding we investigated.
>
> http://partners.adobe.com/public/developer/en/tiff/TIFFphotoshop.pdf
> This supplement was written after our work on 16bit per channel Lab in
> TIFF. It does mention the 16bit per channel issue. I don't know if it
> contradicts or confirms the conclusion Marti and I arrived to in 2001,
> as I haven't investigated, and don't remember too much detail.
>
> Unless Marti feels otherwise, my humble opinion is that, should there be
> any contradictions between our findings in 2001 and any of the
> specification supplements, the specification supplements take
> precedence.
>
> With the original specification, the two supplements, and our work in
> 2001, it seems there's a lot of different stuff people have to
> investigate to come at a total insight on L*a*b* in TIFF. If anyone here
> is willing to help, I'll gladly try and make a good overview and add
> that to the TIFF documentation over at
> http://www.awaresystems.be/imaging/tiff.html. Please let me know.
>
>
> Joris Van Damme
> [EMAIL PROTECTED]
> http://www.awaresystems.be/
> Download your free TIFF tag viewer for windows here:
> http://www.awaresystems.be/imaging/tiff/astifftagviewer.html
>
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