--- a/ptstitch.h
+++ b/ptstitch.h
@@ -43,6 +43,7 @@
                            int numberImages, int featherSize);
 
 unsigned int panoStitchPixelChannelGet(unsigned char *ptr, int bytesPerPixel, int channel);
+void panoStitchPixelChannelSet(unsigned char *ptr, int bytesPerPixel, int channel, unsigned int value);