How to change one color to another?

To change one color to another you need to make color(s) you want to change transparent, then specify background color and remove transparency.

Example*:

ICPCL.exe -convertto jpg "C:\Source Images\*.*" -dest "C:\out\" dither:no -oper ReplaceColor src_color:"r:255,g:0,b:0,a:0"
ReplaceColor dest_color:"r:255,g:255,b:255,a:255" src_color:"r:0,g:255,b:0,a:0" dest_color:"r:255,g:255,b:255,a:255" ReplaceColor src_color:"r:255,g:255,b:255,a:255" dest_color:"r:0,g:255,b:0,a:0"

In this example we changed red and blue color to green.

* This example works the same way with other support formats.