Re: Unique situation when creating scanner profile
Re: Unique situation when creating scanner profile
- Subject: Re: Unique situation when creating scanner profile
- From: david wollmann <email@hidden>
- Date: Wed, 23 Jan 2008 19:30:35 -0700
Roger Breton wrote
David,
Is this the same phenomenon as those people who advovate setting
the GS0
patch on IT8.7/2 and /1 to R=G=B=255? Can you make the case for that
situation too?
Not sure I follow the phenomenon you are referring to? I tested
profiles on the drum scanner where I edited the white point of the
target but did not like the results.
On the drum scanner when I made my profile for that I did no
manipulation of the target and scanned the target at my "Default"
settings. I can scan in 16 bit and I adjust the end points as needed
in Photoshop or I could still use Trident to set end points. Trident
plays well with profiles but this a drum scanner and transparencies.
Reflective materials and flatbeds are different.
Sometimes there is built clipping when using certain tools in a
scanner's software interface. Plus, generally the scanner preview is
low res so it is looser approximation of real data. You can clip the
end points before you know you're doing it.
We also have a 54 inch wide flat bed scanner that uses three digital
cameras to stitch together the finally scan. Someone else made the
profile for that piece of equipment. My whites always have a few
points in them but I really feel that is best.
We end up scanning various paper sources that all have a different
paper white and the artists are using various pigments, watercolors,
pastels, etc. My IT8 target uses none of these pigments, watercolors,
pastels, etc., its always an approximation when it comes to art, but
it still works.
If I need to make a Fine Art print now of the scan I can't have a
value for paper in the scan. Using the procedure I described really
streamlined the process for me to remove any unwanted paper value and
leave only the information from the illustration.
I will then add a second Levels layer just for setting the black
point. I usually just pull in the end point a certain amount because
there is not always black in a drawing or botanical illustration, so
you can't just use the eyedroppers or auto settings. If there is
black I will look at the build and see if it satisfies me for
neutrality and max K. A few tweaks for hue, usually greens that are a
little yellow, and I'm there, I'm ready to print. So yes, my profile
is a little open in regards to the end points but once set all else
moves to where it should be, generally speaking, given the medium and
so forth.
When scanning something that's on paper you almost always want paper
to be zero but you don't always need a Black that is 100%. The
proceeder I described works well for me.
David Wollmann
On Jan 23, 2008, at 4:56 PM, Roger Breton wrote:
David,
Is this the same phenomenon as those people who advovate setting
the GS0
patch on IT8.7/2 and /1 to R=G=B=255? Can you make the case for that
situation too?
If you always try to define paper white, zero, on the scanner you
will at times end up eating into your image and removing data that
you want. You will clip the end point. Once you clip it you can't get
it back unless you rescan.
Assign the scanner profile, then convert to your working space, then
add a Levels Layer. Use the eyedropper tool with the highlight point
set to Zero and then click in your file to set this point. You will
also probably find that as you measure different corners of the scan
with the highlight eyedropper tool that they are not always even and
you may need to click again to redefine your Zero point.
I scan a lot of Botanical drawings where the illustration sometimes
begins just above paper white. If I always tried to set paper white
in the scanner I'd loose a lot of info from the drawing. Setting
paper white afterwards gives me full control over the process.
David Wollmann
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