I need suggestion on which is the best available module/method to compress PNG file with transparent/alpha support.

I tried with ImageMagick, it works great on JPG but when deal with PNG, I can't make the file size smaller. Tried all kinds of method.

I also tried with using PHP imagecreatefrompng, imagepng but it screw up the transparent on output.

The only best I tested is using pngquant (command line). But it is only on my Windows IIS ActivePerl environment. I'm not sure how to install/setup pngquant on my linux hosting server. It is too complicated to me.

So I seek for alternative method in perl which I'm more familiar with.

Any help are very much appreciated. Thanks.

* UPDATE *
ImageMagick using $image->Resize(geometry => "${width}x${height}"); able to resize the PNG (with transparent). Without transparent resize also ok but file size still not small compare to pngquant.

I still need a PNG compression without resizing dimension.

* UPDATE *
This only able to reduce png file size from 1,666kb to 1,228kb without resize dimension.

$image->Set(quality =>'95');
$image->Set(depth=>'8');

[download]

* UPDATE *
After done more test with imagemagick, the best it only able to reduce about 20%. My current final best test still on pngquant where from 1666kb to 377kb. That is Huge difference.

pngquant command used pngquant --quality 20-40 -speed 11 [png file]

* FINAL UPDATE *
I have decided to use pngquant and managed to get it installed on linux.

In reply to PNG compression support transparent by hankcoder

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