How can I change PNG image background color?

[Robert G.]

Cant figure this out

[Joel Bodenmann]

http://api.ugfx.io/group___image.html#ga0cb760bce6be8c9cb1affc5d568663f1

[inmarket]

There are several ways depending on your situation:

1. Your image editor can specify the background color as part of the png file format. Images like this will be displayed with full alpha blending.

2. If you are using the gwinImage object you can specify the background color using the widget style bacground color. Alpha in the image is handled using a cliff value. Alpha values above the cliff are plotted, alpha values below the cliff are left transparent. 

3. If just using GDISP then the API link by joel above is the solution. The same cliff characteristics as for point 2 above apply.