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I am using mask for motion tracking scene, and I want use blur for mask in compositing. what is problem: blender node is bluring mask and make it larger, that causes problem for me, is it possible to make blur inside region of mask? ( blured mask, but in mask area, not outside) Last image has red area, that shows how blur node make mask larger Thanks MASK original

BLURED mask

BLured are is RED

compositing

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    $\begingroup$ Erode and blur? $\endgroup$ – lemon Aug 15 '19 at 7:30
  • $\begingroup$ Thanks, good node $\endgroup$ – Vlad Markelov Aug 15 '19 at 8:21
  • $\begingroup$ Just multiply the mask by the resulting blur. Done. $\endgroup$ – troy_s Sep 15 '19 at 23:14
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Just use a Dilate/Erode node set to 'Feather' instead of a Blur. Setting a negative Distance will erode the edges based on the set Falloff - so it will always be within the region of the mask. For more control of the falloff, set the Falloff of the Dilate/Erode to Linear and add a Color Ramp node or similar so you can control the falloff profile manually.

composite dilate/erode feather

Note the Split Viewer showing the comparison in the Image Viewer window between original (right-hand side) and 'feathered' (left-hand side).

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  • $\begingroup$ Thanks a lot, erode node looks like good solution. Falloff node only available in shader compose, can't use for mask, but erode and color ramp is enough. $\endgroup$ – Vlad Markelov Aug 15 '19 at 8:21
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    $\begingroup$ @VladMarkelov by ‘falloff’ I meant the Falloff property of the Dilate/Erode node, rather than the Falloff node. Glad this helps. $\endgroup$ – Rich Sedman Aug 15 '19 at 9:50
  • $\begingroup$ understood about falloff, thanks) $\endgroup$ – Vlad Markelov Aug 16 '19 at 15:34
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Perform your blur, then apply the emission constriction by multiplying the mask by the result.

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