Profilemaker Pro, Linocolor problems
Profilemaker Pro, Linocolor problems
- Subject: Profilemaker Pro, Linocolor problems
- From: "Broudy, David" <email@hidden>
- Date: Wed, 26 Sep 2001 10:14:14 -0500
I measured a CMYK IT8 target proofed to Matchprint III with PMPro 3.15 and
Printopen 4 (Mac) then scanned an IT8/whatever (the input target one, a C
print) with Linocolor 6 to CMYK TIFFs. the neon "magenta" ramp in the IT8
separated w/PM turns a grayish purply-violet color with CM values around
25/75 in the solid patch. the scan sep'd with the PO profile has a magenta
ramp with expected (lots of M, a little bit o'C) values. of course chroma is
heavily reduced in the latter, but it's still reasonably close to magenta
instead of a wan, sickly purple. subjectively, the sep made with PO is
cleaner, better-balanced, and more pleasing.
both profiles were made with the same separation parameters from the same
target. Linocolor is set to "proof w/white point simulation."
while I can mitigate some of this with Lch sector corrections, I can't fix
it all and I dislike using extensive color bending anyway. generally I want
a WYSIWYG scan and don't do any color mods to image scans.
anyone else observed this phenomenon? I want to do some more experimenting
with rendering intents when I return from Seybold. I did notice a
significant difference in taking a Lab scan of the same images from LC and
separating it in Photoshop with these two profiles using perceptual and
relcol intents but this was a cursory test. I'm under the impression that LC
only uses the relcol intent.
while I have your collective attention (or not), another problem I've seen
in LC is achieving gray balance. if I balance on a Kodak R14 grayscale, the
rest of the images suffer from excessive Y or M color casts. I know I can go
in and manually adjust the gray balance curves with a profile editor, but
the measured proof is in gray balance and I should not need to change those
values.