Speed comparison with imageData 1920x1080

[hh]

Here is a stack that compares simple grayLevel- and invert-filter
for an image of size 1920x1080, needs LC 8 or 9. It shows the power
of this "external" we have via LC Builder/the browser widget.

go stack url ("http://hh.on-rev.com/xstacks/speedComparison.livecode")
or download the file
http://hh.on-rev.com/xstacks/speedComparison.livecode.zip (1 MByte)

The LC Script version is, TMHO, rather fast (feel free to improve it).
The HTML5/js version could be optimized but that may be too hard for
the result ...
Thus the first HTML5/JS call is slower than the following (initiates
caching). The average speed improvement depends on your hardware, this
HTML5/JS version will be in average 20-60 times faster than LC Script.

Note. The improvement is mostly due to the fact, that HTML5/JS uses
your graphics hardware. With a decent graphic card the speed factor
is here (for less simple filters) up to 100.