Re: How to use a specified color as png transparent color?
Maarten Bosmans <[email protected]>
| Newsgroups | gmane.comp.lib.cairo |
|---|---|
| Message-ID | <CA+CvcKTd5C6ywDVjzQ8s0p=RW2ZBPZfqmHQgk7pvY7GthHoYzA@mail.gmail.com> |
2011/10/26 Carlo <[email protected]>: > Hi. I would import a png and copy it on a surface with the "target color" > used as transparent color. > I'm working with different set of png, each set has a background color that > I don't want to show. > How can I make this?? Adding a general remark to Bill's answer: Cairo has no functions for import and export of images. The png related functions are mainly for debugging purposes and intentionally only handle a specific subset of PNG files. Furthermore, Cairo is a vector graphics library, so doing pixel-per-pixel operations on an image is not something we really have good support for. These two thing together mean that you are probably better of using another program/library to edit the png files before you use them in Cairo. Maarten -- cairo mailing list [email protected] http://lists.cairographics.org/mailman/listinfo/cairo