Xenforo and GD, specifying different parameters to achieve smaller JPEG sizes

[TrevC]

I've found the Xenforo core files to specify jpeg compression ratio, but I'd also like GD to:

• Output only interlaced/progressive JPEG'S (so they don't cause content re-flow as sets of large images load in to a thread. This is a serious usability issue for photo-heavy posts/threads.)
• Strip all EXIF data (not sure if this is already being done).
• Strip any color profiles and remaining metadata.
• Perform any JPEG optimizations that are available to achieve the smallest file sizes at any cost.

Has anyone attempted this or know how/where to implement the above? I'm more familiar with ImageMagick than GD. I assume they're capable of similar functions.

Thanks in advance.

 

[TrevC]

The equivalent IM settings would look something like:

-thumbnail 1024x1024 -adaptive-sharpen 0 -interlace Plane -strip

Though, I think -strip may not be required as -thumbnail already strips meta-data.

Cheers

 

[Jake Bunce]

I haven't dabbled with GD very much, but a quick Google search found two resources:

http://php.net/manual/en/function.imageinterlace.php
http://stackoverflow.com/questions/3614925/remove-exif-data-from-jpg-using-php

 

[TrevC]

Thanks Jake.

I'm not a programmer. A few layers in to xenforo core files and I start to feel a bit lost. It's very OO...

I was hoping there was a quick solution to where GD processing settings could be specified. There's the variables for JPEG quality, but not much else that I could find.