Re: Film vs. digicam gamma curve
Re: Film vs. digicam gamma curve
- Subject: Re: Film vs. digicam gamma curve
- From: "S. Jenkins" <email@hidden>
- Date: Mon, 19 Jan 2004 08:27:03 -0500
See these two threads...
http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=005Xce
http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=006Wy4
18 percent gray reflection is approximately 127, 127, 127
on a 0 to 255 scale.
HTH
----- Original Message -----
From: "Jarkko Viljanen" <email@hidden>
To: "Color List" <email@hidden>
Cc: "VVI OY" <email@hidden>; "Gunner Byskov" <email@hidden>
Sent: Monday, January 19, 2004 06:57 AM
Subject: Film vs. digicam gamma curve
>
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
>
--
>
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
::::::::::::::::::::::::::::::::::::::::
>
PixelCom
>
Jarkko Viljanen
>
Kuuliantie 5
>
37470 Vesilahti
>
Finland
>
>
http://www.pixelcom.fi
>
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:::::::::::::::::::::::::::::::::::::::::
>
_______________________________________________
>
colorsync-users mailing list | email@hidden
>
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/colorsync-users
>
Do not post admin requests to the list. They will be ignored.
_______________________________________________
colorsync-users mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/colorsync-users
Do not post admin requests to the list. They will be ignored.