Nayan Deshmukh wrote:
Hi Andy,

Thanks for testing the patches!!

On Mon, Sep 19, 2016 at 5:24 AM, Andy Furniss <>

Andy Furniss wrote:

Nayan Deshmukh wrote:

This series implements lanczos interpolation filter.

Andy, I have made some changes to the code. Can you test the
patches. I hope the artifacts are reduced this time.

The artifacts are still there.


The higher levels involve a hell lot of calucations per pixel so the
decreased fps is expected. I was thinking of having only 2 levels for
lanczos filter ie. 2 and 4.

Christian, will it be fine if we only have 2 levels (with kernel size
2 and 4) of lanczos filter corresponding to HIGH_QUALITY_SCALING_L2
and L3?

2 and 4 still have the offset issue, which does sometimes cause the
white line.

I've found another issue with 2 and 4 = unscaled with a raster locked
res test the 1 pix detail will be lost. The detail does re-appear if you
scale up.

bz2 compressed vid showing the issue -
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