[Digikam-devel] [Bug 232585] New: Image filter effect overview/table

Karl Ove Hufthammer karl at huftis.org
Mon Mar 29 14:36:19 BST 2010


           Summary: Image filter effect overview/table
           Product: digikam
           Version: 1.1.0
          Platform: unspecified
        OS/Version: Linux
            Status: NEW
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel at kde.org
        ReportedBy: karl at huftis.org

Version:           1.1.0 (using 4.4.1 (KDE 4.4.1), Mandriva Linux release
2010.0 (Official) for i586)
Compiler:          gcc
OS:                Linux (i686) release

I have a request for a new feature in the digiKam editor. Many years ago I used
a image manipulation program called Picture Publisher, which had a nice feature
for visualising the effect of changing the colour balance or

Basically, a dialogue is shown, divided into a 3 × 3 table, each cell showing a
scaled down version of the original image, with the effect being applied the
images. The middle image is the original, and on the right the first effect is
applied ‘positively’, and on the left it is applied ‘negatively’. Similarly,
for the top row the second effect is applied positively, and on the bottom row
it is applied negatively. For lightness/contrast, the effect would be that, for
example, the upper right image is ligher and with more contrast, and the lower
right one is darker and with less contrast. It’s a bit difficult to explain,
but I’ll attach a couple of images showing what I mean. The amount of each
effect applied is chosen using two sliders below or at one side of the images.

When the the user clicks on one of the 8 surrounding images (or change the
slider values), the middle image is immediately replaced with that one, and the
whole process is repeated. This makes it very fast and easy to iteratively
adjust the image. Example of though process:

I think the image is too dark. I’ll click the image on the right. Still a bit
to dark – click on the right one again. Perhaps a bit dark still, and needs
more contrast – click on the top-right image. OK, it now needs just a bit more
contrast, and it turned out slighty too bright – adjust the lightness slider
and click on the top-left image. OK, now it’s perfect – click OK to close the

This feature could also be used for choosing the RGB balance, but instead of
crossing the two filters (left to right and top to bottom), each row would
correspond to one colour, so that the entire middle column would consist of the
original image. Alternatively, one colour (e.g., red) could be ‘fixed’, and the
layout only consisting of changes to the two other colours.

I’ll attach two image which should illustrate the features. Of course, the
feature can be used for every situation where you combine two filter effects.

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