Hi,
Could you not put the two bitmaps in separate movieclips, set the
blend mode of the appropriate one to "subtract", then draw the result
into another Bitmap??
Glen
Ian Thomas wrote:
Bojil,
Can you use colorTransform to invert the colour values, then do a merge()?
Ian
On 8/21/07, Bojil Vassilev <[EMAIL PROTECTED]> wrote:
Hey List,
I have BitmapData A and BitmapData B;
Is there a fast routine that from every pixel in A will subtract the
color of the coresponding pixel in B?
I'm looking for a solution using the built-in BitmapData functions,
since a manual looop on every pixel will be somewhat intensive (even if
I use the getPixels>loop ByteArray>setPixels hack to set the pixels,
instead of a setPixel() loop);
BitmapData.merge() is a nice and fast way to add pixels from one bitmap
to another, specifing te amount to be added via a Multiplier param. It
would be cool if one can set a multiplier of a negative value, which
will result in substracting the amount instead of adding it, but that's
not possible.
Maybe a soluton is to have the display object of BitmapData A stacked
above that of BitmapData B, with some BlendMode setting (SCREEN?) that
will subtract B pixels from A pixels?
Other ideas?
Thanks,
Bojil
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