On May 7, 2006, at 7:05 AM, Sander wrote:
Hi there,
I'm trying to do some 3Dish distortions on bitmapData instances,
using loops to copy colons or rows of pixels. It's fast enough for
real-time.
But the result is an aliased picture. I thought I could use the
Convolution filter to influence each pixel by its neighbors,
basically anti-aliasing. Does anyons have experience with this?
Would a slight blur be faster to compute?
A blur is usually a 3x3 convolution matrix. So, no, it's not 'faster'
than a convolution because it is implemented as a convolution anyway
(and if it isn't, a 3x3 convolution should be identical in speed).
You could feasibly try a 3x3 triangle or a 4x4 mitchell filter
instead (you can find the convolution matrix for these online pretty
easily).
Remember, bitmap distortions only respect 256 levels. You could also
perform a scaling matrix into a temporary bitmap, then copy those
results with a reverse scale into the final display matrix with
smoothing turned on. That may work well enough to smooth out any
artifacts you're seeing.
good luck,
jon
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