: Using imagemagick to create vibrant images I'm in the process of helping out a friend who has a bunch of inventory pics. Most appear faded/washed out, and generally dull. I really like the

@Jamie315

Please see Fred's scripts for one of the most impressive collections of ImageMagick scripts for automatic processing, ie.:


autocolor






autotone






bcimage






enrich





including lots of other saturators / vintage effects to help spice up your images.
www.fmwconcepts.com/imagemagick/

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@BetL875

Using ImageMagick I can think of two approaches to batch pseudo-enhance image quality.

I was using the source image from the link you gave for comparison:



1. Two steps involving normalize then auto-gamma filter

convert input.png -normalize normalized.png




convert normalized.png -auto-gamma output.png




Depending on our images' source quality we may also experiment with the auto-level filter for color leveling if needed.



2. Single step sigmoidal-contrast filter for a quick contrast enhancement

convert input.png -sigmoidal-contrast 7,50% output.png




Using this filter will enhance contrast with strength given in the first value (here 7) and a given base of here 50%. These values need adaption for optimum results.

In case we don't care on the original image, or in case we work on a backup copy only we can replace the convert command (which lets us define another output file) and use mogrify instead (to overwrite the source image).

We will not be able to convert all images to best possible results. This depends on far too many factors and can only be done manually for each source image separately.

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@Goswami567

Screening an image with itself in photoshop is equivalent to either -negate -gamma 0.5 -negate or -fx '1-((1-u)^2)' in ImageMagick (the first one is probably faster, -fx is notoriously slow.)

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