Re: Lab in Photoshop
Re: Lab in Photoshop
- Subject: Re: Lab in Photoshop
- From: bruce fraser <email@hidden>
- Date: Fri, 12 Jul 2002 15:58:27 -0700
I think people are making way too much of the "Lab clipping" issue.
In the case of Kodak ProPhoto RGB (which is certainly honking big RGB
with primaries that do not exist in the laws of physics that govern
this universe), the only colors that get clipped are those that have
an a* or b* value of 128 or -128. They get clipped to a value of 127
or -127, respectively.
If anyone can show me a device that captures, displays, or outputs
such a color, I'll start worrying: until then, I really think it's a
non-issue.
A MUCH bigger worry concerning going in and out of Lab is
quantization error, which can be quite severe in 8-bit/channel files.
If you only have 8 bits, you only have 256 data points covering the
whole range of Lab, so you get multiple RGB values mapping to the
same Lab value. Once those distinctions are gone, they're
unrecoverable.
Bruce
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