Legacy ImageMagick Discussions Archive

Hello,

I would like to convert a "fuzzed color" = range of colors around(similar to) a single color in an image, to another "fuzzed color" = range of colours similar to a second, single color.

So far i can only convert a "fuzzed color" to a second, fixed color using:
In this example, the fuzzed range will be created for color #7d7970. But the target color is not another range, but all black.

I would like the replacing target color to be the closer to black, the closer the replaced color originally was to #7d7970. I.e. I would like it to be a mix with the background.

Here an example from Photoshop:

I replace the brown color (fuzzed) in the middle of the image with a yellow color (the closer to the yellow the closer it was to the brown):





Thank you for your help!

I'll use your Photoshop example, i2.jpg.

One way of doing this: create a copy of the original, entirely yellow. Composite this over the original, with a mask (diff.png). The mask is light where i2.jpg is close to brown, and dark where i2.jpg is far from brown.

I find the distance in CIELab colorspace, as I find that best for photographs. For graphics, you might prefer to omit "-colorspace Lab".

"-evaluate pow 20" makes the effect tail off quickly. Change to suit.

Windows BAT syntax.

Thank you!! This works very well. I had to change the PNG format to TIFF, because it took ages to write it out.

Good stuff. Combining the two converts makes it much faster: no need to read the input twice, or to save the mask.