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image export: add option to invert pixel values (but not hues)

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This commit is contained in:
Luke Campagnola 2017-09-13 21:36:34 -07:00
parent 3ddba03d08
commit 5d6be5796b
1 changed files with 11 additions and 2 deletions
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13
pyqtgraph/exporters/ImageExporter.py
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@ -27,6 +27,7 @@ class ImageExporter(Exporter):
{'name': 'height', 'type': 'int', 'value': int(tr.height()), 'limits': (0, None)},
{'name': 'antialias', 'type': 'bool', 'value': True},
{'name': 'background', 'type': 'color', 'value': bg},
{'name': 'invertValue', 'type': 'bool', 'value': False}
])
self.params.param('width').sigValueChanged.connect(self.widthChanged)
self.params.param('height').sigValueChanged.connect(self.heightChanged)
@ -67,13 +68,15 @@ class ImageExporter(Exporter):
w, h = self.params['width'], self.params['height']
if w == 0 or h == 0:
raise Exception("Cannot export image with size=0 (requested export size is %dx%d)" % (w,h))
bg = np.empty((self.params['width'], self.params['height'], 4), dtype=np.ubyte)
bg = np.empty((self.params['height'], self.params['width'], 4), dtype=np.ubyte)
color = self.params['background']
bg[:,:,0] = color.blue()
bg[:,:,1] = color.green()
bg[:,:,2] = color.red()
bg[:,:,3] = color.alpha()
self.png = fn.makeQImage(bg, alpha=True)
self.png = fn.makeQImage(bg, alpha=True, copy=False, transpose=False)
self.bg = bg
## set resolution of image:
origTargetRect = self.getTargetRect()
@ -91,6 +94,12 @@ class ImageExporter(Exporter):
self.setExportMode(False)
painter.end()
if self.params['invertValue']:
mn = bg[...,:3].min(axis=2)
mx = bg[...,:3].max(axis=2)
d = (255 - mx) - mn
bg[...,:3] += d[...,np.newaxis]
if copy:
QtGui.QApplication.clipboard().setImage(self.png)
elif toBytes: