grayscale conversion errors

MS
Posted By
michael_shaffer
May 27, 2007
Views
612
Replies
0
Status
Closed
Those of us who work with scientific imagery, and want to maintain (leastwise control) the integrity of our image data, have learned from PS v5 on to disable "color management". A case in point is that many instrument manufacturers insist (rightly or wrongly) on saving grayscale image data to a LUT-based (aka indexed) TIF. If CM is enabled and we convert indexed to grayscale the histogram will shift considerably relative to whatever grayscale gamma may be the preference. This is not good, but the remedy was thought to be easy … until now.

I just noticed if "dither" is enabled for conversions that ever-so-slight histogram changes can be seen. Disabling this option helps considerably, but I can still see minor but apparent stacking in few channels at the low end and disabling "blackpoint compensation" doesn’t help.

These "errors" are indeed small and of no significance to most of you, but it is important that we not introduce any more artifacts than we have control over (leastwise understand and make note of). For converting an indexed grayscale to simple grayscale, does anyone know how we can totally eliminate the conversion artifacts? Is there a better way to simply strip the LUT?

TIA 🙂

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