Re: Lab values in PS6 softproof?
Re: Lab values in PS6 softproof?
- Subject: Re: Lab values in PS6 softproof?
- From: Joel <email@hidden>
- Date: Tue, 14 Aug 2001 13:17:43 -0500
Stefan Fiedler wrote:
(snip)...we measure very critical colors of a painting or drawing with a
spectrophotometer and read their Lab values - ...(clip)
What is your spectro and setup?
When we select the appropriate ICC output profile in the softproof /CMYK
preview mode the Lab values unfortunately remain unchanged.
Softproof does not change the values in the Info box. The information
in the Info box is equivalent to profiles and parameters chosen in
your Color Settings setup. i.e. if you have EuroScaleCoated as a CMYK
profile in your color Settings, the CMYK values in the info box will
always indicate measurements based on that CMYK profile. Those values
only change when you choose Convert-to-Profile or some other godless
function which changes actual data in the file upon saving, or if you
choose a different profile setup in Color Settings. This is
applicable to all values in the info box.
For the multitude of workflows I now deal with I use say:
Media: Matte Canvas color settings as follows:
RGB = Adobe (via Colorsync)
CMYK = My Matte Canvas output profile
Grayscale = load Matte Canvas output profile
dot gain = 10%
I work in Adobe, tweak and preview Lab numbers using
Convert-to-Profile with Preview on WITHout actually converting.
Bringing up the dialog box is enough to change the IBoxnumbers.
Is this a bug? Is there a workaround in order to match the paintings Lab
values to the RGB file in CMYK preview/softproof mode?
Not a bug. Just a limitation which could use an advanced preference feature.
We use a CMs2 and a d50 2degree, but unfortunately we get CIELab from
the spectro while PS uses ICClab (I'm told). Gets us in the ballpark
but not one to one. L always seems 20 points off but the AB gets us
close. I haven't bothered to find a workaround for this yet (too
busy) but I sure would like a hint or two...:}
--
joel johnstone - designtype
Winnipeg Manitoba Canada
(Monitoring the full gamut of a confused spectrum)