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Add blend modes and blend groups for compositing #31162

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Merged
story645 merged 10 commits into from
Aug 27, 2026
Merged

Add blend modes and blend groups for compositing #31162

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5ad8cab
Add support for specifying the blend mode for an artist
ayshih Feb 15, 2026
9199535
Add Agg code for computing HSL blend modes
ayshih Feb 17, 2026
aebc329
Add support for blend modes in non-PS backends
ayshih May 5, 2026
2ccbbd3
Fix precision loss with Agg compositing
ayshih Feb 17, 2026
22091f7
Add support for Gouraud shading in Cairo-based backends
ayshih Feb 20, 2026
7301134
Fix ability to specify scalar alpha to Agg draw_image
ayshih Mar 4, 2026
ced4c64
Add support for blend groups (aka transparency groups)
ayshih May 5, 2026
fcef182
Add documentation pages and whatsnew entry
ayshih Feb 19, 2026
8c0fee9
Fix Agg rendering of Gouraud shading
ayshih Mar 4, 2026
a848ba4
Add image tests for blend modes and blend groups
ayshih May 6, 2026
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Fix ability to specify scalar alpha to Agg draw_image
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@ayshih
ayshih committed Aug 26, 2026
commit 730113449976c6a5914d69cf6563734ea0b597de
2 changes: 1 addition & 1 deletion lib/matplotlib/image.py
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Original file line number Diff line number Diff line change
Expand Up @@ -650,7 +650,6 @@ def draw(self, renderer):
# actually render the image.
gc = renderer.new_gc()
self._set_gc_clip(gc)
gc.set_alpha(self._get_scalar_alpha())
gc.set_blend_mode(self.get_blend_mode())
gc.set_url(self.get_url())
gc.set_gid(self.get_gid())
Expand All @@ -659,6 +658,7 @@ def draw(self, renderer):
and self.get_transform().is_affine):
im, l, b, trans = self.make_image(renderer, unsampled=True)
if im is not None:
gc.set_alpha(self._get_scalar_alpha())
trans = Affine2D().scale(im.shape[1], im.shape[0]) + trans
renderer.draw_image(gc, l, b, im, trans)
else:
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1 change: 0 additions & 1 deletion src/_backend_agg_wrapper.cpp
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Expand Up @@ -102,7 +102,6 @@ PyRendererAgg_draw_image(RendererAgg *self,
x = mpl_round(x);
y = mpl_round(y);

gc.alpha = 1.0;
self->draw_image(gc, x, y, image);
}

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