re: Custom scanner profiles
re: Custom scanner profiles
- Subject: re: Custom scanner profiles
- From: David Wollmann <email@hidden>
- Date: Thu, 16 Dec 2004 15:13:12 -0700
I've been looking at my Trident scanner profile issue a little further.
This is my problem, if I choose one of my custom made scanner profiles
in Trident and then activate the L*a*b* correction tool, it has a check
box in it's pallet, once I update the preview then I see about 20
points of excess yellow. If I go back to the ColorSync Tab in Trident
and choose a different profile, say the one supplied by Howtek, then
the yellow is removed from the preview again and the final scan.
I have limited tools for looking at these profiles. When I look at the
white point settings they are similar to the supplied Howtek profile.
So I don't think that is a problem, plus the custom profile will work
fine as long as I don't turn on the L*a*b* correction tool in Trident.
The one difference that I can see is that the supplied Howtek profile
for Trident has an A2B0 table that is 8 bit and my new profile has an
A2B0 table that is 16 bit. In doing further testing I noticed that a
supplied Ektacolor input profile that is 16 bit also gives me a strong
unwanted base tint but yet a Kodak DCS 16 bit input profile will not
have the excess base tint.
The difference in these profiles with 16 bit A2B0 tables is the number
of grid points. My custom profile has 33 grid points, the Ektacolor has
32 and the DCS profile has 16 grid points, which is the only one that
does not have the excess base tint when the L*a*b* correction tool is
activated.
Is the A2B0 table used for the preview, or just for the conversion from
source to my working space color in Photoshop?
I have other input profiles that are 8 bit with grid points above 16
and they preview fine. It appears that a profile with an A2B0 16 bit
table with grid points above 16 will not work properly with Trident
3.5.5. when using the L*a*b* correction tool.
Would a profile with a 16 bit A2B0 table with grid points above 16
necessarily cause this odd preview behavior?
David.
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