Re: Grayscale perception
Re: Grayscale perception
- Subject: Re: Grayscale perception
- From: "jc castronovo" <email@hidden>
- Date: Tue, 6 Dec 2005 07:26:37 -0500
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Mark is correct here. I'm quite familiar with both
LVT and CRT film recorders, the inner workings and calibration of each. The
Celco is very good, but no contender in comparison to good LVT output. CRT
output is even more non-linear in the highlights than film and cannot reliably
achieve a D-min of .08 either. Properly processed E6 film pretty much tops out
at this brightness level which makes this a difficult thing to maintain. A more
realistic aim is .10 which is still brighter than Kodak's aims for the LVT, but
CRT recorders typically shoot for .20 or darker for a highlight to avoid the
inherent flare of the tube and the more complex optical system. The darker
aim and the flare of the CRT recorder helps to mask highlight
banding. I have very few issues with banding in either my
LVT or CRT film output unless it's in the file to begin with (generated blends
are clear offenders) in which case we have to add a little noise, but I've
learned not to push the envelope beyond it's limits. We also process our
own film and make custom profiles for our output which helps
tremendously.
---- Original Message -----
Sent: Tuesday, December 06, 2005 2:57
AM
Subject: RE: Grayscale perception
I was referring to large format film recorders. For
retouching purposes, we had to achieve a D-Min of about .08, which required
very high light output, as the film is extremely non-linear in this region.
It's also the region where is is extremely difficult to achieve smooth
gradation.
Mark
Mark,
I have to disagree. I have been using a Celco film
recorder for 10 years. It has 16 bit LUTS and 16 output to the CRT. Extremely
repeatable and stable in color and geometry (it has to be for motion picture
film use). Today its still one of best film recorders you can get. I stopped
using it a couple of years ago because my clients no longer want
transparencies, just digital files. It's for sale now if you want the
best....
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