spreadsheet for CIE-94?
spreadsheet for CIE-94?
- Subject: spreadsheet for CIE-94?
- From: Randy Norian <email@hidden>
- Date: Wed, 28 Jul 2004 14:45:28 -0500
I was working on a spreadsheet to compare some data I have taken.
cell 'A' vs cell 'B', and calculate the delta-E.
Thought I'd use a couple of different methods.
I was able to plug in the equation for Delta-E 76 , but I was sort of
taken aback at the size of the CIE-94 equation. It has a sort of
recursive complexity that I fear I will mangle when entering the
formula. I'm using the Graphic arts constants.
Just wondering if anyone has a spreadsheet that includes this formula
(and might be willing to share) ?
I scoured bruce lindbloom's excellent site, which has nice javascripts-
but I need to put this into a spreadsheet.
Any help? please drop me a note @
email@hidden
thanks!
Randy Norian
PS: I am still working on how to evaluate the 'quality' of a profile.
taking a Lab file, and converting it via profile, directly to the
color space of various output devices. Then printing the converted
file and checking to see how far I am from the original Lab values.
very linear devices- Approval, Polaproof seem to have the least
error btwn Lab file and printed output- perhaps they are most
accurately defined by an ICC profile? Surprised to see average
delta-E 76 of 4 to 5, from the Lab file values, to the printed
output. I was expecting something smaller, for some reason.
Inkjet printers seem to come in with more error, in general, than the
above. I have tried a few other laser and toner-based devices, as
well.
it seems that various classes of output device are sometimes more
accurately , or less accurately, described by ICC profiles. Just
trying to get a handle on where the error is, in my conversion process.
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