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Maximum maxval is 65535

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This commit is contained in:
Andrew Murray 2022-03-10 09:55:47 +11:00
parent 60de3b7d74
commit ad07b04678
1 changed files with 7 additions and 14 deletions
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19
src/PIL/PpmImagePlugin.py
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@ -119,8 +119,7 @@ class PpmImageFile(ImageFile.ImageFile):
if maxval > 255 and mode == "L":
self.mode = "I"
# If maxval matches a bit depth,
# use the raw decoder directly
# If maxval matches a bit depth, use the raw decoder directly
if maxval == 65535 and mode == "L":
rawmode = "I;16B"
elif maxval != 255:
@ -152,7 +151,8 @@ class PpmDecoder(ImageFile.PyDecoder):
)
value = min(out_max, round(value / maxval * out_max))
data += o32(value) if self.mode == "I" else o8(value)
self.set_as_raw(bytes(data), (self.mode, 0, 1))
rawmode = "I;32" if self.mode == "I" else self.mode
self.set_as_raw(bytes(data), (rawmode, 0, 1))
return -1, 0
@ -166,26 +166,19 @@ def _save(im, fp, filename):
elif im.mode == "L":
rawmode, head = "L", b"P5"
elif im.mode == "I":
if im.getextrema()[1] < 2**16:
rawmode, head = "I;16B", b"P5"
else:
rawmode, head = "I;32B", b"P5"
elif im.mode == "RGB":
rawmode, head = "RGB", b"P6"
elif im.mode == "RGBA":
elif im.mode in ("RGB", "RGBA"):
rawmode, head = "RGB", b"P6"
else:
raise OSError(f"cannot write mode {im.mode} as PPM")
fp.write(head + ("\n%d %d\n" % im.size).encode("ascii"))
fp.write(head + b"\n%d %d\n" % im.size)
if head == b"P6":
fp.write(b"255\n")
elif head == b"P5":
if rawmode == "L":
fp.write(b"255\n")
elif rawmode == "I;16B":
else:
fp.write(b"65535\n")
elif rawmode == "I;32B":
fp.write(b"2147483648\n")
ImageFile._save(im, fp, [("raw", (0, 0) + im.size, 0, (rawmode, 0, 1))])
# ALTERNATIVE: save via builtin debug function