RGB Printer Profiling with ColorBlind
RGB Printer Profiling with ColorBlind
- Subject: RGB Printer Profiling with ColorBlind
- From: Darrin Southern <email@hidden>
- Date: Wed, 28 Mar 2001 19:48:33 +1000
For something different, I have been doing some research on building RGB
profiles for the entry level six color epson printers (and sending a RGB
file directly from PhotoShop 6), rather than the prepress centric CYMK
profiles I have been building for the BEST rip and the Epson 7000s.
The ColorBlind Pro 3.6 manual describes the process of defining the targets,
then saving them out as an .eps file, and then raster the files as CYMK in
PhotoShop. The next step is to convert to Multichannel, then change back to
CYMK. Then Split the Channels, then Marge the Channels back to RGB.
This process seems to drop the black channel entirely. The other issue is
that it all depends on what RGB space I have set in my color prefs, for when
the Channels are merged back to RGB, the color patches have different
values, for AdobeRGB or sRGB (I know not to use sRGB, but it highlights the
fact of RGB not being device indepentant).
Doing a straight RGB raster on opening the .eps gives me the depth of the
black channel within the RGB, but again the numeric color values are
dependant on the RGB working space.
PrintOpen 4.0 allows me to build a Standard RGB file and save it as a .tif
to disk, and Heidelberg have supplied two RGB test strips for the DTP41:
PO_RGB_S15_DTP41opt (LZW).tif - has been tagged sRGB IEC61966-2.1 profile
PO_RGB_S15_DTP41(LZW).tif - untagged RGB
Why is one tagged, and the other not ?
Am I looking at this too closely ?
Should I just focus on ProfilerRGB for RGB profiles (with a scanner) ?
Darrin.