Image histogram remapping

Last update: Nov 19, 2022

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Overview

Hmap

An image histogram remapping script written in Python 2.7 by Anthony Kesich and Ross Goodwin. Changes source image so that source image's histogram matches target image's histogram. Requires PIL/Pillow:

$ sudo pip install Pillow

To run Hmap, cd into the directory where hmap.py (for black and white images) or hmap_c.py (for color images) is located. Ensure source and target images have the same height and width dimensions (in pixels), and place them in the directory. Run the script with 2 additional arguments (source and target image files) as shown in the following example.

Example:

$ python hmap_c.py source_image.jpg target_image.jpg

hmap.py

Source Image:

Target Image:

Result:

Photographs by Ansel Adams

hmap_c.py

Color Source Image:

Color Target Image:

Result:

Photographs by Steve McCurry

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Comments

Performance tweaks
Turned pxlsByVal from a list of lists into a list of sets. The reason for this is that pxlsByVal[curVal].remove(pxl) (line 66) has linear runtime for lists, but for sets, remove() runs in constant time.

removed the unnecessary equality check on line 51

some minor changes

For the example bw pictures, the program now runs about 20x faster on my machine.
opened by bheinzerling 0

Owner

Ross Goodwin

Data poet. ________ [ artist, __tech, ]

GitHub http://rossgoodwin.com/hmap

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