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I've taken thousands of photos on a long-term project and I'm doing a time-lapse film.

Due to the different weather and the different light conditions the pictures are partly very differently exposed. The colours are also different.

I already adapted the pictures a little bit with the following command:

convert -auto-gamma -unsharp 1x1+1.7+0.02

Unfortunately you can still see big differences in the time-lapse video. Is there a way to homogenize the images with ImageMagick or other software under Linux?

  • what are you ultimately trying to achieve / record / show? – osullic May 29 '18 at 12:27
  • The pictures show a field on which plants grow. The recording runs for 6 months. You should see the plants grow. – mrremo May 29 '18 at 12:34
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    The problem is that the conditions vary so much, from sunshine to haze, etc, that even the same nominal exposure and WB will probably not give enough similarity to prevent an impression of "flickering". You might consider creating trasitional frames to smooth things out. This answer using GIMP might also be worth a look. – junkyardsparkle May 29 '18 at 19:23
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    You're expecting way too much from such a simple automation when the frames are shot under such widely varying conditions. The only way to even remotely get close to what you want is to shoot it with color checker and white/18% grey/black test targets on the edges of the frame and then use an automated routine that normalizes each frame to them. Of course there's also the issue that most test targets will fade over time when constantly exposed to sunlight. Even then, the effect of fog on brightness/contrast will be more pronounced at longer than at shorter distances from the camera. – Michael C May 29 '18 at 21:30
  • A time lapse is a documentary record, each photo is showing the conditions of the environment in which the photos were taken. Viewers understand that the outside environment changes. If you want "Homogeneous" then control the environment, use a studio. For in the field work you can only do so much if you are relying on auto settings. Be present to adjust the settings on the camera for each photo to get more closely related exposure. ( The difference between bright sun shiny days and dark stormy days will limit your success ) As noted by others: software can only do so much. – Alaska Man May 25 at 16:54

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