Am 01.06.2005 um 11:20 schrieb Joakim Eskildsen:
I have read Bruce Fraser´s articles on the advargse of
editing on
large spaces and its very interisting. I like to ask you if there are
any down sides of all thise colores we cannot see when converting to
the small CMYK color space or the ink-jet color space, and if you make
hevy editing on your 16 bit file will you sooner get into banding in
the big ProPhoto RGB than in LstarRGB? Karsten Krügers writes about
the color rendering problem: colorimetric. It is confusing. Does it
mean thet if you use perceptual rendering or relative colorimetricit
the picture will be compress so the colores change as there are so
much out of gamut and therefore the look and realitionship in the
image will not corispond to the screen anymore? Will this convertion
be more price and eacyer using the smaller colorspaces like LstarRGB?
Rendering intends:
- photographic (same like Perceptional, Foto). Shrinking source gamut
until it fits into output gamut. All colors change, but details are
kept. Grass is grass, wall structure is wall structure, but may be the
grass is greener, the wall whiter etc.
- relative colorimetric: Mapping source and output gamut 1 to 1.
Everything inside the output gamut is 100% identical, everything
outside is clipped to the edge. Grass and wall appear to be flat areas.
- absolute colorimetric: Mapping source and output gamut 1 to 1 like
relative colorimetric. Paper has a color. Most papers are not "100%
white", some are yellowish (cream color), some are blueish (bright
white). Printing 10% magenta on the first tends to look a little bit
orange, printing 10% yellow on the later one a little bit greenish
(cold yellow) because the color of the paper adds to the printed color.
Relative colorimetric ignores this, absolute colorimetric tries to
simulate this behavior.
For samples:
http://homepage.mac.com/karstenkrueger/rendering.htm