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batch processing

Sep 2, 2011, 12:31
Post: #1
batch processing
i've got the latest version of gimp and ufraw.

i have a folder with about 100 jpg files in it that i want to apply a general brightness contrast setting to.

Using the main interface to do each one I would need to go to Tools > Colour > Brightness Contrast and set a Brightness value of 16 and leave the contrast at 0

What i would like to do obvious is to run a batch command to do this operation on all files in a folder

I've tried guessing at a few command lines to do it but all have failed and i have no idea basically how to do it and the help just confuses me even more. - so if any one could provide instructions (dummy style) for me it would be great
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Sep 2, 2011, 16:53
Post: #2
RE: batch processing
Look into the ImageMagick toolbox, it is much more efficient than Gimp for most batch purposes.

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Sep 2, 2011, 17:32
Post: #3
RE: batch processing
(Sep 2, 2011 16:53)ofnuts Wrote:  Look into the ImageMagick toolbox, it is much more efficient than Gimp for most batch purposes.

done that - cannot see any toolbox' this program hardly seems to do anything !!! could you provide a pointer or supply more info
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Sep 2, 2011, 18:37 (This post was last modified: Sep 2, 2011 18:37 by rich2005.)
Post: #4
RE: batch processing
As well as ImageMagick there is Davids Batch processor - a Gimp script.

see: http://members.ozemail.com.au/~hodsond/dbp.html

the only snag for you is the brightness contrast settings go from plus/minus 1.0 rather than +/- 127 so some experimenting / interpolation required.

ImageMagick is a command line application so there is no actual 'toolbox' although the documentation on their web site is most comprehensive.

** https://www.gimp-forum.net/ now answering questions**
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Sep 2, 2011, 19:12
Post: #5
RE: batch processing
(Sep 2, 2011 17:32)shakespear Wrote:  
(Sep 2, 2011 16:53)ofnuts Wrote:  Look into the ImageMagick toolbox, it is much more efficient than Gimp for most batch purposes.

done that - cannot see any toolbox' this program hardly seems to do anything !!! could you provide a pointer or supply more info
Command line haters gonna hate:
http://www.imagemagick.org/www/command-l...tions.html

Among the useful options in your case:
  • -contrast-stretch
  • -auto-level
  • -level
  • -level-colors
  • -gamma
And maybe some others

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