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fixed mapping function, now smooth

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This commit is contained in:
tsennott 2018-07-06 19:49:07 -07:00
parent 3c6fd275c8
commit b19c460568
1 changed files with 11 additions and 9 deletions
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20
src/PIL/ImageOps.py
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@ -136,7 +136,7 @@ def autocontrast(image, cutoff=0, ignore=None):
return _lut(image, lut)
def colorize(image, black, white, mid=None, midpoint=128):
def colorize(image, black, white, mid=None, midpoint=127):
"""
Colorize grayscale image.
This function calculates a color wedge mapping all
@ -176,14 +176,16 @@ def colorize(image, black, white, mid=None, midpoint=128):
green.append(black[1] + i * (white[1] - black[1]) // 255)
blue.append(black[2] + i * (white[2] - black[2]) // 255)
else:
for i in range(0, midpoint):
red.append(black[0] + i * (mid[0] - black[0]) // 255)
green.append(black[1] + i * (mid[1] - black[1]) // 255)
blue.append(black[2] + i * (mid[2] - black[2]) // 255)
for i in range(0, 256 - midpoint):
red.append(mid[0] + i * (white[0] - mid[0]) // 255)
green.append(mid[1] + i * (white[1] - mid[1]) // 255)
blue.append(mid[2] + i * (white[2] - mid[2]) // 255)
range1 = range(0, midpoint)
range2 = range(0, 256 - midpoint)
for i in range1:
red.append(black[0] + i * (mid[0] - black[0]) // len(range1))
green.append(black[1] + i * (mid[1] - black[1]) // len(range1))
blue.append(black[2] + i * (mid[2] - black[2]) // len(range1))
for i in range2:
red.append(mid[0] + i * (white[0] - mid[0]) // len(range2))
green.append(mid[1] + i * (white[1] - mid[1]) // len(range2))
blue.append(mid[2] + i * (white[2] - mid[2]) // len(range2))
image = image.convert("RGB")
return _lut(image, red + green + blue)