Replacing Hexidecimal Colours in Image

[deklin]

I am trying to replace yellow with blue.

This does NOT work:

Code: Select all

convert image.gif -fill #FFE087 -opaque #0000CC imageblue.gif

[snibgo]

You have "-fill" and "-opaque" the wrong way round.

[deklin]

This doesn't work either:

Code: Select all

convert image.gif -opaque #FFE087 -fill #0000CC imageblue.gif

[snibgo]

"-opaque" is an operation. It turns pixels from whatever colour you say to the fill colour. By default, the fill colour is white. If you want to make the fill colour blue, you must set it before the "-opaque" operation.

[deklin]

I am working with an animated GIF.

Code: Select all

convert image.gif -fill #0000CC -opaque #FFE087 imageblue.gif

That works on one frame only. The color is changed on one frame only.

[snibgo]

It should work on all your frames. Any frames that contain #FFE087 will have that colour changed. But only one frame contains that exact colour. Other frames have similar but not exactly the same colours. You can see this with:

Code: Select all

convert image.gif -unique-colors +append txt:

So you need a "-fuzz".