Re: [darktable-user] darktable-chart and missing colorin "standard color matrix"
On Fri, Jan 03, 2020 at 04:25:32PM -0800, jys wrote: > > > > > First of all I wonder why the dtstyle created by darktable-chart > > > includes the module "input color profile". > > Probably to make sure the input profile being used with the > applied style is the same one that was used to create the style > in the first place, otherwise the results won't be valid. Did > you create the style using a camera RAW file and its associated > "standard" color matrix? I created the dtstyle from a regular JPEG file, not RAW image; I'm experimenting with scanner color balance, not camera profiling. Indeed it seems that I have to deal with the "input color profile" of my source images. The one added by darktable-chart is wrong and must be replaced. To be more clear, this is the workflow that now works: 1) Make a scan of the ColorChecker chart, open it in Darktable, assign the most appropriate "input color profile" (which was "linear Rec2020 RGB" in my case) export the image in PFM float format, Lab color profile. 2) Get a reference image of the same ColorChecker chart, i.e. one image with exactly calibrated colors. Export this image too in PFM float, Lab. 3) Launch darktable-chart and use image #1 as "source image" and image #2 as "reference values". Process the images and save the resulting dtstyle. NOTICE: darktable-chart will include an "input color profile" into the style, called "standard color matrix" which is indeed wrong. We will replace it later. 4) Launch Darktable, import the dtstyle created at step #3. 5) Open the image to be color balanced, apply the proper "input color profile" (again it was "linear Rec2020 RGB" in my case). 6) Apply the style imported in step 4 to the image and check the history of the image: remove the last "input color porfile" applied by the style. The image should now be correctly balanced. 7) Save the image history as a new style, this is the only one that you will apply to all other images. Happy Color Balancing! -- Niccolo Rigacci - http://www.rigacci.net/ Campi Bisenzio - Firenze - Italy Tel. Mobile: +39-327-5619352 darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
Re: [darktable-user] darktable-chart and missing colorin "standard color matrix"
* Niccolo Rigacci [01-03-20 07:00]: > Hello Darktable users! > > I'm playing with a ColorChecker and the darktable-chart program > to produce a good Darktable style to apply in my workflow. > > First of all I wonder why the dtstyle created by darktable-chart > includes the module "input color profile". Shouldn't rather the > input profile be added by me, if required? > > The second question is about that input color profile: it seems > invalid because whenever I apply the style I get the following > error message in the text console: > > [colorin] could not find requested profile `standard color matrix'! > > then I find that the sRGB colorin profile is applied indeed, > modifying badly the photo (too washed out!), so that I have to > remove it. > > Do I have a bug on my Darktable installation? What is that > "standard color matrix" profile? My environment is: > > * Darktable 2.6.0 > * GNU/Linux Debian 10.2 Buster your problem may stem from version as many new features were introduced and dt is now at 3.0 with development on 3.1+ -- (paka)Patrick Shanahan Plainfield, Indiana, USA @ptilopteri http://en.opensuse.orgopenSUSE Community Memberfacebook/ptilopteri Photos: http://wahoo.no-ip.org/piwigo paka @ IRCnet freenode darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
[darktable-user] darktable-chart and missing colorin "standard color matrix"
Hello Darktable users! I'm playing with a ColorChecker and the darktable-chart program to produce a good Darktable style to apply in my workflow. First of all I wonder why the dtstyle created by darktable-chart includes the module "input color profile". Shouldn't rather the input profile be added by me, if required? The second question is about that input color profile: it seems invalid because whenever I apply the style I get the following error message in the text console: [colorin] could not find requested profile `standard color matrix'! then I find that the sRGB colorin profile is applied indeed, modifying badly the photo (too washed out!), so that I have to remove it. Do I have a bug on my Darktable installation? What is that "standard color matrix" profile? My environment is: * Darktable 2.6.0 * GNU/Linux Debian 10.2 Buster -- Niccolo Rigacci - http://www.rigacci.net/ Campi Bisenzio - Firenze - Italy Tel. Mobile: +39-327-5619352 darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
