RIMM/ROMM and ProPhoto
RIMM/ROMM and ProPhoto
- Subject: RIMM/ROMM and ProPhoto
- From: Richard Wagner <email@hidden>
- Date: Thu, 2 Nov 2006 15:23:12 -0500
I've had trouble tracking down the significance of the differences
between ROMM RGB and ProPhoto RGB. They are similar, but not
identical, as can be shown by looking at the profile tag tables and
by plotting the gamut maps, especially in Luv or Yxy. They have
different white points and black points, and of course ROMM RGB has
all 3 rendering intents, whereas ProPhoto does not. ProPhoto is not
simply a renamed ROMM RGB, as some have suggested, yet I really
don't understand (nor have I been able to search and find a reason as
to) how ProPhoto came about. Why does ACR output to ProPhoto, rather
than ROMM RGB? (I know, not your software.) It would seem that there
would be an advantage in staying within ROMM RGB until the conversion
to the ultimate device destination space (e.g., a printer space). Is
there an advantage to ProPhoto as far as display speed (matrix-
matrix), or some other advantage over ROMM RGB? ProPhoto was
obviously created/simplified for a reason, but I'm missing the
significance and driving force for the simplification.
In generating sRGB output from ProPhoto masters, I appear to get
better results by converting from ProPhoto back to ROMM, then
converting to sRGB using Perceptual with BPC. Is this a reasonable
workflow? I want to keep my masters in ProPhoto, but RelCol
conversions to sRGB for web use, etc. are lacking.
Thanks for any insight.
--Rich Wagner
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