I have a problem with Floyd-Steinberg dithering algorithm in Python. It keeps getting out of bounds on its width. I've checked many sources and I can't figure out where is the mistake... Here is my code:
def floydSteinberg(src, colorPalette):
src = src.copy()
h,w = src.shape[:2]
for y in range(h):
for x in range(w):
oldpixel = src[x][y]
newpixel = colorFit(oldpixel, colorPalette)
src[x][y] = newpixel
quant_error = oldpixel - newpixel
if (x<w-1):
src[x 1][y] = src[x 1][y] quant_error * 7/16
if (x>0) and (y<h-1):
src[x-1][y 1] = src[x-1][y 1] quant_error * 3/16
if (y<h-1):
src[x][y 1] = src[x][y 1] quant_error * 5/16
if (x<w-1) and (y<h-1):
src[x 1][y 1] = src[x 1][y 1] quant_error * 1/16
return src
And the error:
line 33, in floydSteinberg
src[x][y 1] = src[x][y 1] quant_error * 5/16 IndexError: index 180 is out of bounds for axis 0 with size 180
Tested image is 180px wide. I also tried substracting 1 from w or h in for loop, but it does not help at all (just to see if that will do something)
CodePudding user response:
Your height and width seem to be swapped. Try changing:
h,w = src.shape[:2]
to:
w, h = src.shape[:2]
and it should work.