Sounds a bit like Run Length Encoding
Dave Mennenoh wrote:
Hi all, I've been working on allowing users to dowload a jpeg from a
movieClip in AS2 and came up with a simple, yet novel compression
idea, that's a bit like RLE but not quite.
Basically it is this - analyze the image pixel by pixel to get the hex
color codes into an array. Then, make a new array the same length as
the colors array, but filled with "" - so it's full of nulls. I then
iterate the colors array and if the current color is the same as the
previous color, I don't add it to the new array - otherwise I do.
So if I have: [ff, ff, ff, aa, ff, aa, aa, aa, aa] the new array would
be [ff, , , aa, ff, aa, , , ]
It makes it easy to reconstruct too, and it's taken about 7 seconds
off in my tests. Saving a 300x320 image went from about 26sec to now
19sec. It's not huge, but everything is something...
Dave -
Head Developer
http://www.blurredistinction.com
Adobe Community Expert
http://www.adobe.com/communities/experts/
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--
Glen Pike
01736 759321
www.glenpike.co.uk <http://www.glenpike.co.uk>
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