I want to use progressive jpg files and want to know if craft image transforms save jpg images as progressive, or can they be made to?
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You can achieve progressive JPGs if your server has Imagick installed, but it doesn't look like the image processing library that Craft is using has added support for it, yet.
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Does this mean that one day Craft will support transforming progressive JPGs? Provided Imagick is installed of course. – Josh Angell Nov 21 '14 at 14:10
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Yes. At least in the current version (3.2.6+)
On the image transformation page, you can select one of the interlacing methods under the "Interlacing" heading. I'm not exactly sure the differences or pros/cons of each but I've used "Partition" and it works well.
