<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7652.24">
<TITLE>Color management behaviour</TITLE>
</HEAD>
<BODY>
<!-- Converted from text/plain format -->
<P><FONT SIZE=2>Hi all,<BR>
<BR>
I'm definitely lost with color management, I'm experiencing a number of issues (which I'm going to describe) and I do not understand where (if)<BR>
I'm doing something wrong.<BR>
<BR>
I'm using digiKam 0.10.0 on Kubuntu Jaunty.<BR>
<BR>
I refer to some screenshots you can find on Picasa ath the following address: sorry for the localized interface.<BR>
<BR>
<A HREF="http://picasaweb.google.it/giordani.leonardo/DigiKam0100KubuntuJaunty">http://picasaweb.google.it/giordani.leonardo/DigiKam0100KubuntuJaunty</A>#<BR>
<BR>
My color management settings are:<BR>
<BR>
Monitor: eye-made profile built with lprof (Samsung SyncMaster) - it is identical to an sRGB profile<BR>
Workspace: sRGB (since my monitor is limited)<BR>
Input: Canon Profile<BR>
Rendering: Perceptual<BR>
<BR>
Since screenshots describe my workflow I'll comment them all.<BR>
<BR>
01. First I start with a RAW file (.CR2) made by my Canon EOS 350D<BR>
<BR>
02. I open it in Image Editor and digiKam ask me about "convert" or "assign" to current workspace profile (sRGB): since the source image is RAW<BR>
I choose "convert".<BR>
<BR>
03. Here is my picture: it is a bit dark since the histogram (not shown in the screenshot, sorry) is concentrated on low keys.<BR>
<BR>
04. If I try to deactivate color management (with the small bottom right icon) I obtain a picture with a brown look. You can see it on screenshot<BR>
number 09, where I compared the two side-by-side.<BR>
<BR>
Question 1: why, if my monitor has am sRGB-like profile, does the picture change when I activate/deactivate color management?<BR>
<BR>
05. After some work I obtain the final picture.<BR>
<BR>
06. I save it as JPEG (aiming for example to Web publishing) and the small preview on the left side of the screen looks different, just like the<BR>
picture with color management deactivated.<BR>
<BR>
07. When I close Image Editor I see that the preview of my JPEG has that brown look I did not have in Image Editor; the same happens with Gwenview or<BR>
any other image viewer. If I open it with The Gimp it says "The image has a color profile (sRGB), convert to sRGB built-in?". Both converting and letting<BR>
the original profile result in a correct image.<BR>
<BR>
Question 2: why, if the built-in profile is the common sRGB, digiKam, Gwenview and others do not see it correctly? Why Gimp can? I understand that an<BR>
application cannot implement Color Management, but this is an sRGB profile, the "de-facto" standard when no color management is active. Or not?<BR>
<BR>
08. If I try to open the JPEG with digiKam it keeps asking me if I want to convert or assign the sRGB color profile.<BR>
<BR>
Question 3: why does digiKam not recognize the built in profile?<BR>
<BR>
10. Now I try to deactivate color management. Picture in Image Editor looks different (understandable, without camera profile).<BR>
<BR>
11. After some work I end up with a picture that, when saved, viewed with Gwenview, Gimp or whatever, is always identical.<BR>
<BR>
Question 4: why now every application can see my picture correctly? I tried to move them on my laptop, which has a poor monitor, and I can barely see<BR>
the differences with my main monitor both in the color-managed picture and in the other one.<BR>
<BR>
Thank you very much in advance for your answers, and thank you for digiKam<BR>
<BR>
Leonardo<BR>
</FONT>
</P>
</BODY>
</HTML>