Re: Off Topic: Which colorspace to use

["Miller Abel" <miller.abel@solopoint.com>]

C. D. Tobie wrote:
> As i stated earlier photoprinters are one of the big reasons for using a
wider space, Colormatch will not do them justice, AdobeRGB would be the
minimum, and in some instances EktaRGB is justified.

I assume that representing the tonal response of these photoprinters of
which you speak (e.g. LightJet, Fuji, Lambda, etc.) must require greater
than 8-bits per channel? If not, wouldn't any space larger than 24-bit True
Color be wasted?

And since, without adding bits to each channel, you can't pay Paul without
robbing Peter, more purple (for example) must mean tonal resolution was
"stolen" from complimentary colors and the available "numbers" were simply
remapped to mean something different. This must result in posterization,
even if subtle.

Do images in Adobe RBG(1998) and JoeRGB spaces require greater than 8-bits
per channel? If so, file sizes would have to be larger than for 24-bit True
Color or information would be lost when images are saved.

What have I missed?

I applogize if these questions seem a bit academic, I'm just trying to
understand why I'd want to adopt non-linear response curves in my
device-independent workingspace rather than utilize the actual color space
defined by linear (i.e. isotropic) channel response.

I understand wanting to preview using device-specific profiles and to apply
profiles when printing, but why throw out color resolution in the saved
image? Shouldn't I just use more bits-per-channel and leave things linear?

Miller Abel
Santa Cruz, CA

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