Dear Michael, Thanks for your kindly help. I have another question: How can I fill a region with gradient color using gegl? Best Regards. At 2013-09-29 21:55:00,"Michael Henning" <drawoc@xxxxxxxxxxxxxxxxxx> wrote: >To use gegl:transform, you need to create the transformation matrix >yourself. There are plenty of tutorials for learning how to create >transformation matrices online. > >Then, do this to set the node's property: > >1. When you create your matrix, place it in a GeglMatrix3 struct. It >contains one member named coeff, which is a 3x3 array of doubles for >the matrix values. >2. Turn the matrix into a string with gchar* gegl_matrix3_to_string >(GeglMatrix3 *matrix); >3. Set this string as the property "transform" on your gegl:transform >node with gegl_node_set. >4. Free the string from (2) with g_free > >Anyway, I hope this helps! Feel free to ask if you have any issues. > > -- drawoc > >On Sun, Sep 29, 2013 at 6:06 AM, beee <gdb_1986@xxxxxxx> wrote: >> Hi, >> >> I want to apply perspective effects on an image. But I can't find an >> operation for it. I thought maybe I can do it with gegl:transform. But I >> don't know which parameters should use. >> >> Please help. Thanks! >> >> Regards. >> >> >> >> >> _______________________________________________ >> gegl-developer-list mailing list >> List address: gegl-developer-list@xxxxxxxxx >> List membership: https://mail.gnome.org/mailman/listinfo/gegl-developer-list >> >> _______________________________________________ gegl-developer-list mailing list List address: gegl-developer-list@xxxxxxxxx List membership: https://mail.gnome.org/mailman/listinfo/gegl-developer-list
