Correcting my previous post.
You don't have to set the imageData explicitly. I was confused by vanishing
images.
Apparently if you want to set all of the imageData to numToByte(0) or
numToByte(256) the image vanishes.
The workaround is to set it to 1 or 255 respectively. This is in LC 9 GM
Kind regards
Bernd
Here is the corrected script
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on mouseUp
local tAlphaData, tTransparent, tOpaque
local tCollect, tLength
-- not needed here but if you want to modify existing AD
put the alphaData of image 1 into tAlphaData
put numToByte(1) into tTransparent -- dont set to 0 or image vanishes
put numToByte(255) into tOpaque -- dont set to 256 or image vanishes
put the width of image 1 * the height of image 1 into tLength
repeat tLength
--put tTransparent after tCollect
put tOpaque after tCollect
end repeat
set the alphaData of image 1 to tCollect
end mouseUp
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