458 ActionScript classes
A matrix convolution is based on an n x m matrix, which describes how a given pixel value in
the input image is combined with its neighboring pixel values to produce a resulting pixel
value. Each result pixel is determined by applying the matrix to the corresponding source pixel
and its neighboring pixels.
For a 3 x 3 matrix convolution, the following formula is used for each independent color
channel:
dst (x, y) = ((src (x-1, y-1) * a0 + src(x, y-1) * a1....
src(x, y+1) * a7 + src (x+1,y+1) * a8) / divisor) + bias
When run by a processor that offers SSE (Streaming SIMD Extensions), certain filter
specifications perform faster.
■ The filter must be a 3 x 3 filter.
■ All the filter terms must be integers between -127 and +127.
■ The sum of all the filter terms must not have an absolute value greater than 127.
■ If any filter term is negative, the divisor must be between 2.00001 and 256.
■ If all filter terms are positive, the divisor must be between 1.1 and 256.
■ The bias must be an integer.
A filter is not applied if the resulting image would exceed 2880 pixels in width or height. For
example, if you zoom in on a large movie clip with a filter applied, the filter is turned off if the
resulting image reaches the 2880-pixel limit.
Availability: ActionScript 1.0; Flash Player 8
See also
applyFilter (BitmapData.applyFilter method), filters (MovieClip.filters
property)
, cacheAsBitmap (MovieClip.cacheAsBitmap property)
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