Hello,
Digikam offers great integrated tools for easy correction of photos. Maybe we should study the interface of these tools:
http://www.digikam.org
The manual:
http://docs.kde.org/development/en/extragear-graphics/digikam/digikam.pdf
Section 2.3.4 teaches color correction:
The section explains how to read color curves. Color curves show the distribution of RGB colors. When flat colors are well distributed and the photo is well exposed. When over-exposed, the curves have a right distribution.
Section 3.2 photo workflow
1. Exposure: White Balance
2. Color: White Balance
3. Black and white points: White Balance or Adjust Levels
4. Contrast: Adjust Curves
5. Saturation: White Balance or Vivid or Hue/Saturation/Lightness
6. Resizing (interpolation) : Change Size
7. Sharpening
The process is the same for video adjustment.
Also digikam uses liblensfun, a library to correct lens errors. I don't know how it implemented in the interface, but many cameras suffer from lens distrotion. The interface seems to be described in Perspective Adjustment, section 3.2.5.5
All that needs to be implemented at MLT level. GEGL could provide the underlying treatment for MLT. I had a look at digikam SVN. It seems very actively developped and very well organized in code. I will ask advide to digikam developers and will get back with the URL of the discussion.
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The frei0r balanc0r filter that I made uses Digikam's code. Yes, showfoto looks nice, but I have think more about how we might collaborate with this project.
Why would showfoto use MLT? The former Kdenlive leader is Jason Wood. Gilles was a contributor.
Hello,
I tried Showfoto and his color correction tools... and I think that Kdenlive absolutely need these tools to attract professionals!
They will answer most needs in television production.
You should just add a osciloscope / vectorscope in addition of the histogram in order to not too upset habits of video editors.
I will talk with various video editors to know what they think about these tools ...
Best regards
this is defiantly an essential element if kdenlive is going to be taken seriously. my two cents is that we will need to be able to add bars in preferable from a drop down list. these of cause need to be correct for the medium PAL/NTSC/HD ect.
I haven't had a chance to test the above mentioned software but you back and whites need to be maintained. the color curves must not crush your deep blacks or bright whites or we will have probles lifting dark scenes extra.
limiters, as a second filter, to cut excess blacks and whites, TV safe in other words.
if this works correctly we should be able to do a pull in of video or tiff (DPX if that not aking to much) and export with out loosing color space especially in the highs and lows.
thanks to everyone.
Hello,
I'm just bumping up this thread to know if there has been any news on the ffmpeg side, or any progress in the integration of advanced color correction tools in Kdenlive.
Advanced color correction is to my mind one of the most needed features to make Kdenlive competitive with apps such as Vegas Studio or Premiere Elements, which I consider to be in the same league as Kdenlive. (Well, that and keyframable effects, but one thing at a time ;)
No, there is no progress, and I do not expect it for a long time because we have too many bugs and simpler improvements to work on.
Here is my post on digikam ML. You can follow discussions:
http://mail.kde.org/pipermail/digikam-devel/2009-July/031188.html
It seems reasonable to believe that we could use some of Digikam dialogs and that we may link MLT to Digikam too. This is only a first approach. All this needs to be studied in details.