get null pointer exception for same code in draw that works fine above

jeffmarc

 In draw loop
 location,rr,cc all int
 rd,grn,blu all float

get null pointer error on first line that tries to set rd to red pixel value.

 location=rr*width+cc;  
 println(rr,cc,location);
 rd=red(pixels[location]);
 grn=green(pixels[location]);
 blu=blue(pixels[location]);
 println("RED="+rd,"GREEN+"+grn,"BLUE+"+blu);

jeffmarc

println gives good numbers for rr,cc and location above rd=red(pixels[location]);

Chrisir

did you load the image and use loadPixels();

GoToLoop

https://processing.org/reference/loadPixels_.html

Chrisir

when you have no image

just use loadPixels();

;-)