Apparently, the cropping area is miscalculated in the
ImageOps.fit() function in PIL 1.1.7:
Calling fit() with bleed=0.0 should return an image without
any removed border:
# @param bleed Remove a border around the outside of the image (from all
# four edges. The value is a decimal percentage (use 0.01 for one
# percent). The default value is 0 (no border).
However, the returned image after the internal call of crop,
i.e. after the lines
out = image.crop(
(leftSide, topSide, leftSide + cropWidth, topSide + cropHeight)
)
is in fact cropped: 1 column/row of pixels is removed at the
right hand side and at the bottom, i.e. if we start with
a 100×100 pixel image and call ImageOps.fit() without
the bleed and centering parameters (or with bleed=0.0):
print "before image.crop:", image.size
out = image.crop(
(leftSide, topSide, leftSide + cropWidth, topSide + cropHeight)
)
print "after image.crop:", out.size
this results in:
| before image.crop: (100, 100)
| after image.crop: (99, 99)
If I assume that the convention in ImageOps.crop() is correct,
i.e.
left, top, right, bottom = _border(border)
return image.crop(
(left, top, image.size[0]-right, image.size[1]-bottom)
)
then crop should be called with the arguments "0 0 size[0] size[1]"
if NO cropping is intended. This means that EITHER already the
definition of liveArea (in ImageOps.fit()) should be changed from:
liveArea = (
bleedPixels[0], bleedPixels[1], image.size[0] - bleedPixels[0] - 1,
image.size[1] - bleedPixels[1] - 1
)
to
liveArea = (
bleedPixels[0], bleedPixels[1], image.size[0] - bleedPixels[0],
image.size[1] - bleedPixels[1]
)
OR the definition of liveSize should be change from
liveSize = (liveArea[2] - liveArea[0], liveArea[3] - liveArea[1])
to
liveSize = (liveArea[2] - liveArea[0] + 1, liveArea[3] - liveArea[1] + 1)
OR cropWidth and cropHeight should be defined as
cropHeight = liveSize[1] + 1
cropWidth = liveSize[0] + 1
This problem is independent of the one concerning the
centering parameter that I described in my message from 30 July.
Best regards
Olaf
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