Just to be clear - I do prefer the new default progressive image processing!

In this case I have a client who isn't happy with the resolution of a couple of their uploaded images, despite having image quality settings at "Maximum". I've requested from them a full-resolution original image for my evaluation and testing. Being able to turn off progressive mode will help me eliminate that as a cause of degradation.

Thanks for the reply and I'm all set for now.

~ Deborah

Yes, you'd just need to comment that line in the two places it's found in that file.

And anytime we thumbnail or modify images there might be a loss in quality, but it should be mostly not noticeable.  There's a setting in /data/settings.dat.php for advanced > imageResizeQuality that sets the quality value for http://php.net/manual/en/function.imagejpeg.php to 80.  This is a little higher quality then the default.

Why do you need to disable progressive images? 

1) Other than the following change, are there any other changes needed to disable 'progressive' save?

/lib/image_functions.php

... change this:
imageinterlace($targetImage, true);


... to this:
imageinterlace($targetImage, false);

2) If a JPEG image already saved in progressive format were uploaded via CMSB, would CMSB's resizing/resampling using progressive format result in a lower-quality finished image than if the upload was saved in baseline, instead? Maybe something I'll have to test?

~ Deborah