On 22.03.2018 20:49, Michael Van Canneyt via Lazarus wrote: > Is there a version of TColorDialog which allows to specify an Alpha > channel ? Not in the LCL itself. Maybe you can try to build one using http://wiki.lazarus.freepascal.org/mbColorLib#RGB_color_pickers I didn't use it myself, it just popped up in a Google search. Ondrej