Photoshop Color Settings - Conversion Options
Photoshop Color Settings - Conversion Options
- Subject: Photoshop Color Settings - Conversion Options
- From: Louis Dina <email@hidden>
- Date: Wed, 10 Sep 2014 15:35:12 -0500
I have been through this before a number of years ago, but want to be sure
I have this clear in my mind.
I took a wide gamut RGB target with very saturated colors and brought it
into Photoshop. It was untagged, so I tagged it with ProPhoto RGB to give
me the widest possible gamut and the most saturated Lab numbers. Then, I
converted it in PS to a high gamut RGB printer profile (glossy RC paper on
an Epson 3880). I used Relative Colorimetric with BPC for all the following
conversions.
Before converting from ProPhoto RGB to the destination printer profile, I
altered my Conversion Options in the PS Color Settings dialog box.
1. The first conversion from ProPhoto RGB was done with Color Settings
Conversion Options set to Abs Colorimetric and BPC turned Off.
2. The second conversion from ProPhoto RGB was done with Color Settings
Conversion Options set to Rel Colorimetric and BPC turned Off.
3. The third time, my conversion from ProPhoto RGB was done with Color
Settings Conversion Options set to Rel Colorimetric with BPC turned On.
The actual conversion was done from Edit > Convert to Profile > Rel Col and
BPC.
In each case, the Info Palette shows that the RGB numbers are identical,
regardless of Color Settings Conversion Options. However, the Lab readout
in the Info Palette is different for each conversion.
So, if conversion options is set to AbsCol w/o BPC, I am assuming the Lab
readout is showing what the actual Lab numbers would in the dried print if
I read the print with my spectro (assuming a perfect conversion, of
course). Is that correct?
Assuming that is correct, I'm a little less clear on why I get different
Lab numbers when Color Settings have RelCol Conversion Options, one with
BPC turn On and one with BPC turned Off. In both these cases, white shows
up 100L/0a/0b, which I feel confident is the color of paper white (which is
less than 100/0/0). What surprised me, however, was that Black was
different, one reading 7L/0a/0b, and the other reading 1L/0a/0b. I would
have thought they'd be the same.
I could use some clarification.
Also, which Conversion Option makes the most sense to leave as the default
setting in Color Settings?
Thanks,
Lou Dina
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