Re: ICC DCam part 2
Re: ICC DCam part 2
- Subject: Re: ICC DCam part 2
- From: Michael Schnelle <email@hidden>
- Date: Fri, 04 May 2001 11:42:38 +0200
- Organization: Winkler Studios GmbH
Steven Kornreich schrieb:
>
Hmm interesting. I do fine art reproduction only. I use a Better Light 6k
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scan back, and what I have been using is the ColorChecker DC chart and
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either profile maker or ColorSynergy to build input profiles. I use
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BestColor Rip and print to both Epson 9000 and Roland FJ-52. My results have
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been from excellent to not s good. I believe I am having problems with
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getting the exposure correct on my Better Light. So basically what you did
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was get a Kodak gray scale wedge and cut it up. keep the first two hi light
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patches, the middle gray and the two dark shadow patches correct?
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I am all confused. Basically what do you do first in getting a good
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exposure?
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Hi Steve !
To get the right white balance and contrast with the Eyelike DCS You only can an
only need to set the white- and black-point.
My second digital unit is a Dicomed scanner ( ! very similar to Betterlight
because its the first version ! ) , to get the right grey balance my cut-out
greyscale is not enough. Therefore I use the complete greyscale because I can
measure more than only white an black in the BigShot-software. I don4t know how
it is with the Betterlight-software.
The whole work I do like I described in my first part is to easily use the Kodak
Greyscale for easy measuring grey-balance in a calibrated and profiled system.
The only thing You have to look for after grey-balance is to be sure that the
exposure range of the picture (not the grey scale !)You will scan is within the
range of Your IT8 Testchart. For example You scanned the TC with a range of
white-patch at RGB 250 and black-patch at RGB 5 and used this as measuring-file
for making Your profile. With this You tell Your CM-system that every value
higher than 249 in Your camera-files will be set at 255 after profiling- that
means white without details !
Then You scan something where you have a white point of R 255 G 255 and B 245,
may be a light yellow. Decrease the exposure until You get the highest value just
under 250 and the result may be R249 G240 B230 and You will see that this light
yellow in reality is a light orange and it will be reproduced correctly after
profiling!
If You didn4t correct the exposure the highlight range of Your reproduction will
have cut-out-lines from highlight with some information to only 255-white blocks.
Another example: a few days before I made photos of cheddar-cheese with high
contrast lighting. The cheese is orange but in my files it looked yellow because
the Red-channel was at 255. I decrreased the exposure about 2/3 stops and the
cheese looked original and I profiled the file. Because the rest of the picture
was a little bit too dark now I corrected the illumination only in the L-channel
of the LAB-file. The result is a sunny picture with correct colors ! One of 90%
where CM leeds to nearly correct color-reproduction.
The next thing is Your printer. I think Your daily work is reproduktion with the
BetterLight and printing the files on Your Epson and Roland. Make an RGB-file
with 256 grey-patches and print it out on Your printers with Your normal
settings. F.e. in highlight at 245 and more there is no more ink-dot on Your
paper and at 15 or less there is only black. This will be Your range You have to
work when setting the exposure for the camera. Do You profiled Your printers with
400% ink ? F.e. the printer-profiles You can get from BestColor are profiled with
400% ink but this is too much !
Sorry for the long description but I allways try to work perfectly and to explain
exactly !
With regards
Michael
Winkler Studios GmbH
Michael Schnelle
email@hidden
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