Image Compression?

[ZiNgA BuRgA]

It doesn't set interlacing/progressive mode, so whatever the default is.
Unfortunately, I can't tell what it is from the documentation, because the following statement is contradictory:

Quote:If you want to output Progressive JPEGs, you need to set interlacing on with imageinterlace().

Taking an image from the gallery here seems to show that JPEGs are interlaced.  I doubt you'll get much of a size difference for typical thumbnails though (I got <0.5% size reduction for a quick test image).

If you want to change it yourself though, open inc/xthreads/xt_image.php, and before the line

PHP Code:

imagejpeg($im, $fn, $this->_jpeg_quality);

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add

PHP Code:

@imageinterlace($im, false);

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I suspect progressive JPEGs aren't as widely supported as interlaced, though it shouldn't be much of an issue with today's web.