Profile causes posterisation
Profile causes posterisation
- Subject: Profile causes posterisation
- From: Stone Quay Studio <email@hidden>
- Date: Mon, 30 May 2005 21:54:39 +0100
Hi Everyone,
My name is Eric Perlberg, I'm a photographer in London, England and I make
ICC RGB printer profiles for other photographers using my Eye One Photo kit.
A professional client of mine this past week had a very strange experience
and I was hoping that someone could give me some insight into what might be
happening.
I made a profile for Epson Archival Matt from his Epson 2100 which he uses
with Mac OS X 10.4. He took a RAW file from his Canon IDs 2 and opened it in
Capture One Pro into Adobe RGB and saved it out as a 16 bit tiff. He opens
it in Photoshop where its recognised as Adobe RGB and uses the profile I
made to softproof (using either perceptual or rel colorometric) no tonal
changes or sharpening added. In both cases there are some clear
posterisations which happen in both shadow and highlight areas of the image
(we tried several images, all had areas of posterisation). When the file
prints, the posterisations are there. His Photoshop colour policies seem
right. Normally Match 3 software is great and other photographers seem quite
happy with the results from the profiles I make and I'm happy with the
profiles I make for me. These posterization effects are not subtle, they're
immediately noticeable. I've never seen this from one of my profiles.
To further complicate things, before coming to me, this client had a profile
made by one of the big London colour management specialists paying £135 for
a profile (same paper, ink, printer) made with ProfileMaker and a
spectrolino. That profile does the exact same thing in the exact same places
(he brought it back to that specialist who spent an hour with him and told
him to get his camera profiled). However, a profile this client had made for
him a few years ago doesn't cause the posterisation effect nor does the
epson canned profile though both leave a lot to be desired in other areas.
For what its worth, his monitor is hardware calibrated with a new eye-one
display and his viewing conditions are very good.
There must be a reason that this posterisation is happening from two
independent producers of profiles but not with all profiles. Anyone have any
ideas I can try out to help him? If it isn't the profile, is there something
else I can check that might be responsible?
Cheers,
Eric
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