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apply the efflut early for uint16 mono/rgb, uint8 rgb

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KIU Shueng Chuan 2021-04-09 08:51:24 +08:00
parent 38fbb3fa46
commit 29ad432f5a
1 changed files with 13 additions and 1 deletions
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14
pyqtgraph/graphicsItems/ImageItem.py
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@ -455,10 +455,22 @@ class ImageItem(GraphicsObject):
lut = self._effectiveLut lut = self._effectiveLut
levels = None levels = None
if image.dtype == self._xp.uint16 or (image.ndim == 3 and image.shape[2] == 3):
# apply the effective lut early for the following types:
# 1) uint16 mono
# 2) {uint8, uint16} rgb
# this converts the input image to an uint8 image of shape
# (h, w) or (h, w, 3) or (h, w, 4), depending on the lut's shape.
# we don't do it for uint8 mono so that it will use Format_Indexed8
image = fn.applyLookupTable(image, lut)
lut = None
# now both levels and lut are None
# when calling makeARGB() with lut and no levels, we need to # when calling makeARGB() with lut and no levels, we need to
# explicitly set scale. This ensures that makeARGB() will skip # explicitly set scale. This ensures that makeARGB() will skip
# applying levels. # applying levels.
scale = lut.shape[0] - 1 if lut is not None:
scale = lut.shape[0] - 1
break break
# Convert single-channel image to 2D array # Convert single-channel image to 2D array