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From: Tomas By
Subject: gdk-pixbuf-add-alpha
Date: Tue, 01 Dec 2015 20:15:51 +0100
User-agent: XS4ALL Webmail

Hi all,

I am trying to change a colour to transparent by doing this:

(gdk-pixbuf-add-alpha img #t (integer->char r) (integer->char g) (integer->char b))

(Doing `interger->char' seems a bit weird but passing ints causes errors.)

However, the image is not changed (I write it out using gdk-pixbuf-save-to-port).

Doing it on the command line works fine:

  convert old.png -transparent 'rgb(R,G,B)' new.png

so I am pretty sure there is no problem/misunderstanding regarding the file and the colours.

Anybody have any ideas how to do this in Guile?


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