Re: electron blues and colorvison spyder
Re: electron blues and colorvison spyder
- Subject: Re: electron blues and colorvison spyder
- From: neilB <email@hidden>
- Date: Mon, 23 Apr 2001 23:01:05 +0100
On 23-4-01 at 12:45 PM, email@hidden (Robert Wright) wrote:
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I finally did find the 'precal' section of photocal which is when
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you lie to the program and say you have individually adjustable
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guns.
It was told thats that PhotoCal has no ability to load an LUT to the video
card so that makes your PreCal work much more important.
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It seems like there are an infinite number of combinations of contrast and
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white balance that will give you a screen luminance between 85-95 and a gun
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differential less that 0.5. I can't remember the units. But each 10k
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adjustment in the white balance produces a very different screen image. i
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think to get it where I have it now, and it looks a little magenta now,
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(very subjective) I ended up at 6640k and about 83% of max contrast. My
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luminance was 90 and variance 0.4. Should I go for the best compromise
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nearest 6500k, or go for the best numbers overall?
If you are profiling the screen to 6500K after hardware
calibration you should go for the best compromise ABOVE 6500K
and, I'd say, go for about 95 luminance too. A profile has a hard
job to raise the white point.
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In addition, when I go back in the monitors control panel and select my old
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profile, it does not look the same as as before the calibration.
Are you surprised it looks different?? Since you've now altered
the screen's characteristics the old profile is useless now.
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Again,
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subjective impression. Does the calibration do something to the guns or the
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luts such that they cannot reproduce old profiles, or is this an alias
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problem in colorsync, pointing to the wrong profile? I'm pretty sure its
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not an alias problem though.
OK, I get it, you were surprised.
a calibration sets up the screen as well as possible so the
profile has less to do. a profile characterises the screen in
it's calibrated state, change the calibration [or brightness or
contrast] and you need as new profile.
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When the rubber meets the road, on my old profile, the monitor was very
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close to the output of my 1160 on premQglossy using the glossy film setting
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in profiles and glossy setting in media.
the relevance of the screen's similarity to an unprofiled printer is somewhat suspect.
get the screen calibrated nicely,
run a profile,
compare it to a print, within reason it should have similar characteristics.
If not you need a good printer profile.
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The archmat also looks good on its
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respective settings. On the new profile, I'll have to do some more printing
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and looking to know. Overall the difference between the two profiles seems
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to be in the green magenta bias.
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Someone on the epson list suggested I create a grey-scale gradient in ps and
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look at it on screen. There were alternating magenta and green 'bands' in
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the 3/4 tone-midtone. I did not know what to make of it.
looks like a badly set up screen I think.
I'd avoid the profiling and colour management recommendations of
the epson list if I were you.
neilB
Neil Barstow
phone: 44 (0) 1273 774 704 fax: 44 (0) 1273 323 454
mobile: 44 (0) 77 78 16 02 01