Fix download images to match live gl3d plot #4566
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etpinard
reviewed
Feb 10, 2020
| var q = 255 / a; | ||
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| for(var l = 0; l < 3; ++l) { // RGB | ||
| pixels[k + l] = Math.min(q * pixels[k + l], 255); |
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Can explain why we need to apply this transform when exporting images?
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Unlike openGL, webGL premultipliedAlpha in enabled by default.
To get correct RGB values from the webgl context it was needed to devide RGB values by alpha.
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Ok, what would happen if we instead disable premultipliedAlpha on image exports?
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Good question; but that didn't work: demo.
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Fixes #4378 | Demo
@plotly/plotly_js
cc: @alexcjohnson