如何在ImageMagick中更改亮度色调并部分饱和图像？

Question

I have a PNG which (besides a white spot and transparency in the background) is a pretty straight blue.

I would like to use convert from ImageMagick to partially desaturate it, so that I can create images with the original blue at one extreme, and regular desaturation (I know that color theory allows a lot of desaturations, but I'm just looking for GIMP-style desaturation.)

I would also like to lighten or darken the colors to an image.

Lastly, I would like to change the hue for the bulk of the images, to anything on the hue scale. (The image is a saturated blue.)

I can do all of these in GIMP but I am looking for a way to automate the process. I also want to resize down, but that much was clearer from the docs.

How can I do these adjustments?

Answer 1

This might help. It uses this image as input - I am not so artistic and is a pretty literal interpretation of your teardrop image description...

#!/bin/bash
for hue in $(seq 0 40 160); do
   for sat in $(seq 20 40 100); do
      convert -label "Sat:$sat,Hue:$hue" input.png -modulate 100,$sat,$hue  miff:-
   done
done | montage - -frame 5 -tile 3x m.png