Andy Matthews wrote:
> Word to your mom Rick! I was hoping you'd get that in there.
The gaussian and box blurs are nearly unusable because of the speed.
Coldfusion just can't handle doing that much math.
For example, in the gaussian blur.... to do an image of 400x300, you're
dealing with 120,000 pixels. If your radius is 5, then you're grabbing
the RGB values of the nearest 5 pixels and applying a normal
distribution to compute the new RGB value of the center pixel. so
that's 600,000 iterations.
And then you have to do it again for the vertical pass.
1.2 million iterations ...
I just did some performance testing and I've discovered that doing my
RGB separation calcs in a UDF is a *BAD* idea.
I just modified the gaussianFilter.cfc to *NOT* use the separateRGB()
udf and cut the processing time for an image from 96 to 77 seconds.
It's still ridiculously slow, but that's still a 20% performance
improvement. I guess there's a little overheard hitting a UDF 1.2
million times.
I'm going to update the box blur too... and maybe also develop an object
oriented interface to imagecfc
<cfscript>
objImage = createObject("component","imageObject");
objImage.init("C:\Inetpub\wwwroot\myimage.gif");
objImage.resize(400,300);
objImage.addText(fontDetails,"Sample Text");
objImage.save(compression=95);
objImage.saveAs(filename="C:\Inetpub\wwwroot\myimage.gif",compression=95);
<cfscript>
I think it might simplify use... but I don't want to mess with the main CFC.
Sure would be nice if Coldfusion allowed multiple methods with the same
name and different argument types, like java does...
ooImage.init(filename); // initialize from a file
ooImage.init(400,300); // initialize a blank image
ooImage.init(bufferedImage); //initialize with a bufferedImage object
Rick
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