Need Help with 9x9 convolution

cfb2000 · **Joined:** Apr 11, 2014 **Posts:** 16

Okay not really a convolution. Just uses the corner pixels under the mask. I have a working version using gimp_pixel_fetcher_get_pixel

. I want to use gimp_pixel_rgn_get_row using the prepare row method, but all the plugins I've seen uses 3x3 matrices. Can anyone help me figure out how to use this method? Oh when its finished I'll be sharing it. Nothing fancy, just a fragment pixelate filter. Also working on a Kuwahara (facet) filter.

Graechan · **Posted:** Tue Apr 15, 2014 8:19 pm **(#2)**

Gimps Convolution Matrix is 5x5 and I've never tried anything larger, not to mean it wont work

saulgoode · **Posted:** Tue Apr 15, 2014 9:32 pm **(#3)**

GIMP's Convolution Matrix plug-in provides an excellent coding example -- in fact, if you #define BIG_MATRIX in that plug-in, it will work with 11x11 kernels.