Re: grid like artifacting with scale operations

Just an update, we're 99.99% positive now, that this is just to do with the bicubic filtering when doing transforms in After Effects.

Since I posted this earlier today, I have found that if you use the resize image command in Photoshop and switch the filtering to 'smooth bicubic' the grid becomes softened as to almost disappear, you have to look hard to see any trace of it (to the degree that I think it would pass tech checks). Would be great if After Effects had the option to change what filter you used in a similar fashion (or even had an additional transform filter for these tricky situations, which allowed transform filter changing).

I have been conversing with a friend in Canada who has since done his own tests in Shake using a grey solid, grain, then resized using different tranform filters. He has found it does occur in Shake too (but again this must be image specific because in the example I have posted it doesn't seem to have the grid problem). His results using different transform filters were:

BOX: Brutal. Moving on...
SINC: Very good, but too sharp
GAUSS, QUAD, TRIANGLE: Slight Gridding & quite soft
DIRAC, IMPULSE: Blergh, visible stretching at seams.
LANCZOS: Slight gridding, but sharper than GAUSS
MITCHELL: Halfway between LANCZOS & GAUSS

One of those strange things where maybe we should not be looking so close at these images (higher scalings are fine, it is the ones within 10% that are an issue).

Still looking for ideas for work arounds if anyone has them?