Olympus-OM
[Top] [All Lists]

[OM] Re: color difference between photoshop and acdsee

Subject: [OM] Re: color difference between photoshop and acdsee
From: Moose <olymoose@xxxxxxxxx>
Date: Fri, 22 Dec 2006 02:20:51 -0800
Komtanoo Pinpimai wrote:
> Hi,
>
> I have a question about color redition on computer screen.
> Now, I'm using Capture1 to process raw file, everything looks good in the
> program,
> but when I processed it to tiff or jpeg file and view with acdsee, the color
> of the image in acdsee looks paler than that's of Capture1.
> However, the color of the tiff/jpeg image in photoshop seems to be matched
> with Capture1.
> I did more test on firefox and get the same color as acdsee.
> In short, in my laptop, the color of an image in Photoshop/Capture1 is
> different from the color of ACDsee/firefox.
> My question is:
> 1. Is there a way to calibrate these programs to show the same color ?
>   
Capture1 and PS are color space aware applications. ACDsee and Firefox 
are apparently not. (Although what I see in PS and Firefox is very similar.)

Each tiff and jpeg may have a color space indicator included in it. It 
then knows what color space to render it into when displaying it. I 
believe what you are seeing is an image being rendered differently by 
color space aware vs. unaware programs.
> 2. If I'd like to order my digital photo printed with a pro lab, how do I
> know if the color shown in my screen matches with lab's printer & paper ?
>   
This is a much more complex question. Color management is the term for 
the process where each link in the process is checked against a color 
standard and given an ICC profile that defines it's differences from the 
standard. Drivers, as for monitor and printer, may then adjust the image 
to correct for the known errors in the device.

This provides a means to keep color correct through film/scanner or 
sensor, computer display and printer/paper combo. If you don't have your 
monitor calibrated, there is no way except trial and error to match the 
image on it to prints. With a profiled monitor and a profile for the 
printer/paper combo you will be using, you should get prints that nicely 
match what you saw on the screen. Printer profiles for pro labs are 
provided by the lab. Profiles for many consumer print sources are 
available on the web.

This is a different part of the process, but it may give you a more 
concrete idea of what I'm talking about. Here are comparisons of scans 
of film with and without an ICC profile for the film 
<http://www.moosemystic.net/Gallery/tech/Scan/VuesProf/>. I could, of 
course, adjust the unprofiled scans to look better in PS, but I would 
have no way of knowing how accurate they were. The same thing applies 
between monitor and printer/paper. Only if both are profiled can you be 
assured of a good match. And as you can see, the match goes beyond 
simple color and includes the tonal curves that determine saturation, 
contrast, etc.

This is a complex subject that fills some books, and I am no expert, so 
I can't answer all your question. I can say that with a profiled monitor 
and some very modest adjustment to my printer driver, I get prints that 
look quite close to what I see on the screen in PS.

Moose

==============================================
List usage info:     http://www.zuikoholic.com
List nannies:        olympusadmin@xxxxxxxxxx
==============================================

<Prev in Thread] Current Thread [Next in Thread>
Sponsored by Tako
Impressum | Datenschutz