lowpass only on pixels in mask

[kofa (István Kovács)]

@chris

I am pretty sure there are more elaborate algorithms

This one isn’t too difficult, but needs access to the mask:

Difficulty with Blurs and Masks

Supposedly, this could work: create a mask blurred_image_mask = blur(image * mask) blurred_mask = blur(mask) blurred_image = blurred_image_mask / blurred_mask (use an arbitrary value when mask = 0) apply blurred_image to base image via mask. The idea is that if you had a pixel in the background, far from the subject that you want to preserve, the value of the mask will be 1 there, so those areas of the image are preserved as-is. There will be a ‘black hole’ where the subject is. After the blu…