[argyllcms] Re: Spectral to sRGB
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 14 Oct 2010 09:30:00 +1100
Pascal de Bruijn wrote:
Are there any guidelines to translate "accurate color" to "general web
use", if that makes any sense at all...
It only makes sense if you define what you want. One decision is whether
you are after a side by side color match or an appearance match.
The first implies a side by side colorimetric match. The second implies
that the viewer adapts to each viewing situation separately.
Another decision is whether you are attempting to match a single color,
or a range of colors. The former implies gamut clipping, the latter gamut
compression.
Ideally you would specify the color in its native colorspace, and tag
the colorspace with an ICC profile, so that the destination can choose
intent and sort out how to translate the color into the local device colorspace.
If you want to send RGB values, then it's safest to assume the destination
is sRGB, and tag it as such if tags are possible.
If you're trying to convey a color defined by a reflective sample viewed at
the destination, then a colorimetric match is doubly difficult if you
don't known the actual destination illumination and display device response.
An appearance match is easier, since these both correspond to white point
matched intents, but the viewing conditions can only be guessed at or assumed.
If you want to do gamut compression, then you have to define the source
gamut you want to keep relative to each other, as well as assume a destination
gamut.
Graeme Gill.
Other related posts:
