Re: Scum Mark
Re: Scum Mark
- Subject: Re: Scum Mark
- From: Rob Griffith <email@hidden>
- Date: Thu, 13 Nov 2003 19:17:42 +0000
>
I use a profiling application (name withheld) which has a major bug in the
>
Macintosh version! Basically when you create printer profiles (mainly cmyk
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inkjet,) you end up with what I believe they call a 'scum mark' in areas of
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the printed image that should be clear of ink. I have been informed that there
>
is a way to 'remove the white point' that would fix this by editing the nCIE
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file after measuring the patches but prior to creating the profile.
>
>
Please get as detailed and in-depth as your hearts desire, I appreciate any
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help that you can spare.
>
Hi Martin
Your use of the phrase "nCIE" file makes me think that you are talking about
ColorBlind. If so you are right. There is an issue with ColorBlind profiles
and certain CMMs that puts in a scum dot, most notably on the Best RIP. It
gets worse if you use 16 bit profiles.
There are two things I can suggest. Firstly ditch Colorblind and get
something more up to date like Monaco or Gretag. Harsh I know but worth it
in the long term. I have been using Monaco now for almost a year after
suffering with ColorBlind and the results I get are so much better.
Secondly, there are ways to fix the problem, one is to use ColorBlind Edit,
but this can cause you to lose highlight detail that you want to keep. The
other that I think might work is some of the editing features in X-Rite's
ColorShop X. Send me a profile off list and I'll see if I can help.
I have also occasionally seen this problem in some rips when using an 8 bit
profile as source and a 16 bit profile as destination. If this is the case
then rebuild the destination profile as 8 bit.
Regards
Rob Griffith
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