Inno Setup - how to show a transparent PNG Image?

Question

I want to show it on the welcome page.

How is that possible?

Answer 1

In 5.5.7 update (28th December 2015) there was 32bit BMP with Alpha Channel function implemented.

The WizardImageFile and WizardSmallImageFile [Setup] section directives now support 32 bit bitmap files with an alpha channel. Use the new WizardImageAlphaFormat [Setup] section directive to specify if the bitmap file has its red, green and blue channel values premultiplied with the alpha channel value or not. Contributed by Honza Rameš via GitHub.

and

Pascal Scripting changes:
Class TBitmapImage now supports 32 bit bitmap files with an alpha channel. Make sure to set the Bitmap.AlphaFormat property before loading the bitmap file.

http://www.jrsoftware.org/files/is5-whatsnew.htm