Film vs. digicam gamma curve
Film vs. digicam gamma curve
- Subject: Film vs. digicam gamma curve
- From: Jarkko Viljanen <email@hidden>
- Date: Mon, 19 Jan 2004 13:57:45 +0200
- Organization: PixelCom
Hello!
A colleague of mine is teaching professional photographers and is
confused with how digital cameras treat image data. The issue rises when
trying to compare the gamma curves of film material with digital camera
performance.
Here is an example: Lets take a photograph of a target, in which there
is full black (D2,1), 18% gray (D0,7) and white (D0,0), using a
professional digicam. When the image is opened in Photoshop, the
RGB-values in info for black is about 30, gray 127 and white about 240.
What we would expect for the values would be black 2-4, white about 250
and gray 46-47 (to represent the photographers gray card, which the
target is). However the gray looks right on the monitor and further,
also when printed: it is the gray we started with (D0,7).
Did anyone get a clue what we are talking about or what is happening there?
Jarkko
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PixelCom
Jarkko Viljanen
Kuuliantie 5
37470 Vesilahti
Finland
http://www.pixelcom.fi
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