Dave -
Thanks so much! Yes, your routine is much faster than mine... though
I'm not sure why!!
Here is my code:
on mouseUp
put alphadata of image "black" into temp
put the milliseconds into tStart ## for speed calc
repeat with n = 1 to number of chars in imagedata of image "A1"/4
put char n*4 of imagedata of image "A1" into char n of temp
end repeat
put the milliseconds - tStart && length(tMaskData) ##speed score
set alphadata of image "black" to temp
end mouseUp
For some reason, even though my loop is only a quarter of the length
of yours with just one line of code in it (and no decisions) it is
much slower. It was slower still because I was (for daft reasons I
wont go into!) originally doing the loop backwards.
I'll try to tweak to improve speed further, but even as it stands I
think it should be fine.
Also, thanks Ken for the links. They helped me understand what is
going on now!
Regards,
Happy Chris
On 4 Jul 2006, at 18:10, Dave Cragg wrote:
I'm not sure what calculations you are doing in the loop, but it
sounds too slow. The following routine creates alphaData from a 300
x 300 grayscale image in less than a second on my not so fast
machine. (You'll probably need to substitute the calculation inside
the loop with your own.)
I'm sure others will step up with faster alternatives. :-)
on mouseUp
put the imageData of image 1 into tImageData
put the milliseconds into tStart ## for speed calc
put 0 into tCount
repeat for each char tChar in tImageData
add 1 to tCount
if tCount = 4 then
put numToChar(255 - charToNum(tChar)) after tMaskData
put 0 into tCount
end if
end repeat
put the milliseconds - tStart && length(tMaskData) ##speed score
set the alphaData of image 1 to tMaskData
end mouseUp
Cheers
Dave
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