<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd"><html><head><meta name="qrichtext" content="1" /><style type="text/css">p, li { white-space: pre-wrap; }</style></head><body style=" font-family:'Sans Serif'; font-size:10pt; font-weight:400; font-style:normal;">Hi Leonardo,<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>I'm quite a newbie on color management, but I'll try to describe my setup and workflow in the hope it helps you.<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>I'm using an EOS 450D and digiKam 0.10.0 on openSuSE 11.1. The first thing with CR2 files is that they don't have an embedded or built-in color profile.<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>But, we need to tell digiKam which is the camera profile. I've been wandering a while with Digital Photo Professional (the raw converter/editor supplied by Canon). At least in mine, the camera profiles can be found under the folder<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>C:\Program Files\Canon\Digital Photo Professional\icc<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>There are in fact a pair of ICC profiles, one for sRGB color space and one for <br>
AdobeRGB color space, for each picture style available<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>Faithful: fs.icc, fa.icc<br>
Landscape: ls.icc, la.icc<br>
Neutral: ns.icc, na.icc<br>
Standard: ss.icc, sa.icc<br>
Portrait: ps.icc, pa.icc<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>So if you work with sRGB colorspace, the suitable camera profiles should be fs.icc, ls.icc, ns.icc (*s.icc for sRGB), and so on. Copy them to /usr/share/color/icc under Linux and configure the path and preferred input profile on the Color Settings setup tab. These profiles are *not* identical to standard sRGB or Adobe RGB, they are specific to the camera model. This can be the reason you see the picture differently with/without color management.<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>As for the monitor profile, monitors come frequently with a "driver" in CD, part of which is the monitor's color profile. For example, I own an LG Flatron (not quite a good display as I would be pleased to have ;-) ). I searched on the driver CD and found the file lh1970hr.icm, which is the display profile for this particular model. As before, I copied this file to /usr/share/color/icc and selected it in digiKam setup. And as before, the monitor's profile is *not* identical to standard sRGB (although approximate), it is specific to the display model.<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>On the other hand, a distinction must be made between profiling and calibrating a monitor. Both are **essential** to have a good, or at least acceptable, color-managed workflow; otherwise you'll get under/overexposures while adjusting, as well as color shifts/casts. So in addition to getting a good monitor profile, you need to calibrate as much accurately as you can the monitor's black point, white point, and gamma. I suggest the methods described in the excellent tutorials and charts from Norman Koren at<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>http://www.normankoren.com/makingfineprints1A.html<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>which, if you don't need an extreme color accuracy, can be done "eyeball" without the need of a spectrometer.<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>Personally I always shot RAW in Adobe RGB colorspace, as it is a bit wider than sRGB and well suited for editing / printing. On the RAW converter I select the Landscape Adobe RGB input profile (la.icc) for general use, but change it when appropiate (pa.icc for portraits for example).<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>Once finished editing, I select Color -> Color Management, set Input Profile = Embedded profile, Workspace profile = sRGB and click OK to convert from Adobe to sRGB. Then I save the finished image in JPG or PNG format with sRGB embedded in it. In this way I see the picture OK in digiKam as well as in Gwenview or the GIMP.<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>Maybe the camera profiles are different for your 350D, but you can install Digital Photo Professional in a Windoze box, and use the filemon.exe utility from Micro$oft<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>http://technet.microsoft.com/en-us/sysinternals/bb896642.aspx<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>to investigate which files are opened/used during conversion and editing. One or more of them will be the camera profiles :-)<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p><p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>Wow, sorry for the length ;-) I hope that if something is wrong the "gurus" will reply with the truth (don't forget I'm also a newbie :-)), simply it works quite well for me.<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>Regards,<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>Francisco<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p><p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p><p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p><p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p><p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p><p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>On Viernes, 19 de Junio de 2009, Leonardo wrote:<br>
Hi all,<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>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>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>I'm using digiKam 0.10.0 on Kubuntu Jaunty.<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>I refer to some screenshots you can find on Picasa ath the following address: sorry for the localized interface.<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>http://picasaweb.google.it/giordani.leonardo/DigiKam0100KubuntuJaunty#<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>My color management settings are:<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>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>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>Since screenshots describe my workflow I'll comment them all.<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>01. First I start with a RAW file (.CR2) made by my Canon EOS 350D<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>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>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>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>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>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>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>Question 1: why, if my monitor has am sRGB-like profile, does the picture change when I activate/deactivate color management?<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>05. After some work I obtain the final picture.<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>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>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>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>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>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>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>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>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>Question 3: why does digiKam not recognize the built in profile?<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>10. Now I try to deactivate color management. Picture in Image Editor looks different (understandable, without camera profile).<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>11. After some work I end up with a picture that, when saved, viewed with Gwenview, Gimp or whatever, is always identical.<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>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>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>Thank you very much in advance for your answers, and thank you for digiKam<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>Leonardo<br>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br></p>> Hi all,<br>
><br>
> I'm definitely lost with color management, I'm experiencing a number of<br>
> issues (which I'm going to describe) and I do not understand where (if) I'm<br>
> 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<br>
> address: sorry for the localized interface.<br>
><br>
> http://picasaweb.google.it/giordani.leonardo/DigiKam0100KubuntuJaunty#<br>
><br>
> My color management settings are:<br>
><br>
> Monitor: eye-made profile built with lprof (Samsung SyncMaster) - it is<br>
> identical to an sRGB profile 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<br>
> "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<br>
> the screenshot, sorry) is concentrated on low keys.<br>
><br>
> 04. If I try to deactivate color management (with the small bottom right<br>
> 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<br>
> 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<br>
> 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<br>
> brown look I did not have in Image Editor; the same happens with Gwenview<br>
> or any other image viewer. If I open it with The Gimp it says "The image<br>
> has a color profile (sRGB), convert to sRGB built-in?". Both converting and<br>
> letting the original profile result in a correct image.<br>
><br>
> Question 2: why, if the built-in profile is the common sRGB, digiKam,<br>
> Gwenview and others do not see it correctly? Why Gimp can? I understand<br>
> that an application cannot implement Color Management, but this is an sRGB<br>
> profile, the "de-facto" standard when no color management is active. Or<br>
> not?<br>
><br>
> 08. If I try to open the JPEG with digiKam it keeps asking me if I want to<br>
> 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<br>
> different (understandable, without camera profile).<br>
><br>
> 11. After some work I end up with a picture that, when saved, viewed with<br>
> Gwenview, Gimp or whatever, is always identical.<br>
><br>
> Question 4: why now every application can see my picture correctly? I tried<br>
> 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<br>
> in the other one.<br>
><br>
> Thank you very much in advance for your answers, and thank you for digiKam<br>
><br>
> Leonardo</p></body></html>