Re: Humans (and cameras and scanners) do not have a color.. simple answer
Re: Humans (and cameras and scanners) do not have a color.. simple answer
- Subject: Re: Humans (and cameras and scanners) do not have a color.. simple answer
- From: Marc Levine via colorsync-users <email@hidden>
- Date: Fri, 10 Jan 2020 19:23:31 -0500
Hi list,
Here’s the deal with MonacoEZcolor (MEC): the product Wire is asking about.
MEC does use an uncalibrated scanner. However, there’s a trick involved. For
that product, you would output your printer profile chart with color management
off. The printed chart has a ghosted “scanner it8 image”, to which you would
tape your photographic IT8 (came with the software). You would then scan the
whole the whole thing with all the smarts turned off and feed that into the
software.
The software would:
1) collect the scanned RGBeez from the taped-on photographic IT8
2) look up the reference lab values for the taped-on IT8
3) using those 2 sets of data, build an input profile for the scanner. Note:
you could save that profile as the scanner profile, effectively making the
scanned “calibrated”
4) collect the RGBeez from the imaged of the printed output target (same scan)
5) convert that second set of RGBeez to Lab using the scanner profile (now you
have Lab... just like it you measured it)
6) use the “simulated lab” and the output target chart def (a bunch of RGBeez
or CMYKays, depending on your print driver) to build your printer profile.
It was pretty trick and often worked really well (sometimes too well!) it
wasn’t perfect due to the constraints of the lightsource of the scanner. In
those days, inkjet inks were not as mature as they are today. Sometimes they
were a little wonky in their spectral characteristics... which made them look
really different when illuminated by the scanner lamp compared to a bonafide
spectro.
I never thought of this back then.... but I guess you could have even made a
transmissive print profile provide using transparent film it8 and scanning the
whole thing transmissively. I must have a copy of that software around here
somewhere!
; )
A little long winded... but hopefully clear.
-Marc
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