Re: 16-bit vs 8-bit output profiles
Re: 16-bit vs 8-bit output profiles
- Subject: Re: 16-bit vs 8-bit output profiles
- From: Rich Apollo <email@hidden>
- Date: Thu, 6 Apr 2006 10:36:28 -0500
The table data in an ICC profile can either be 8 bit or 16 bit,
so you either get 1 part in 256 or 1 part in 65536 precision
in how the color values are specified within the profile.
If your PCS is XYZ, then 8 bit is pretty useless (and technically
non-standard), since the XYZ is highly non perceptually uniform.
If the PCS is L*a*b*, then 8 bits may give acceptable results
in some circumstances, since the worst case quantization
error will be 0.75 delta E (for the A2B table),
but for high quality, 16 bit with PCS XYZ or L*a*b* is
recommended (unless profile size is an overriding factor).
Thank you, Graeme.
Let me try to paraphrase to see if I'm understanding this correctly:
A 16-bit output profile should provide greater accuracy in mapping
from device to PCS. This level of precision is particularly needed
when the PCS is perceptually non-uniform.
Is that right?
Rich Apollo
314-344-1144
email@hidden
www.prioritylitho.com
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