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Negative values for "Shadow Filter Sharpen" break shadows

Shadow Filter Sharpen works as expected for values of 0 and higher, sharpening the shadow with higher values: alt text
However when using negative values the shadows get inverted: alt text
I would expect the following behaviour:

  • Negative sharpening blurs the shadow

  • If for technical reasons blurring is not possible, the value should be clamped to positive values

Tested in 4.6.1 and 4.7 preview 7, both give the same results.

Product Version: Not Selected
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asked Feb 14 '15 at 04:40 PM in Rendering

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