a question about gdk-pixbuf

hi, every one,

I had a question about gdk-pixbuf. I want to show some bmp files and
finished the job by following steps:
1. create a pixbuf using *gdk_pixbuf_new_from_file() *
2. draw that pixbuf using *gdk_draw_pixbuf()*
it works fine, but I noticed that those bmp files all have a background
color (pink), and I want to hide it.

I think it has something to do with mask, but I don't which function should
I use, could it be *gdk_pixbuf_render_threshold_alpha()*, or *
gdk_pixbuf_render_pixmap_and_mask()*? and how to use it?

Is there any one who can help me? many thanks!

Sha li
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