Image histogram remapping

Related tags

Image Processing hmap
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:

Source Image

Target Image:

Target Image

Result:

Result

Photographs by Ansel Adams

hmap_c.py

Color Source Image:

Color Source Image

Color Target Image:

Target Image

Result:

Result

Photographs by Steve McCurry

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Comments
  • Performance tweaks

    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, ]
Ross Goodwin
GitHub http://rossgoodwin.com/hmap
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