New Post: Feature request: Histogram Matching

I first use Image Magick to auto-rotate my scanned images, then I realized that I can do much more whit it. I was trying to process Landsat Satellite images and it worked.

Basic Landsat 8 Pansharpening workflow:

1. combine three Landsat bands (usually 2,3,4) to RGB image
2. change the Color Space to LAB(or a similar one, with one channel representing light(gray) values)
3. scale image to 200%
4. separate channels
5. replace the Lightness channel with the Landsat Panchromatic Band (in Landsat 8 it’s Band 8)
6. recombine channels to previous Color Space
7. change the Color Space back to RGB
   

Consequence: The final product resolution is 15m, the original was 30m.

Due to the different sensor and/or spectral characteristic of the bands (the panchromatic band tend to be a bit darker) it is suggested to do a histogram match between Lightness channel and Band 8 in step 5.

In Landsat 7 the difference was so big that it was nearly impossible to reproduce the original RGB image. In Landsat 8 the difference is much smaller so a simple histogram match can reproduce the original image with just a little shift in the overall colors. (no more need to hire a magician to do some “Magick”)

I found a script already doing this in the Image Magick shell version:
http://www.fmwconcepts.com/imagemagick/histmatch/index.php

I would be great if this function is implemented in Magick.NET but I don’t know how useful it would be in general image processing tasks.