K2 image is the image that you upload via the image tab in the item edit form. There are many reasons why we convert “K2 images” to JPG: from speed to performance (no disk IO checks, no database records for filenames, less memory for GD to resize the pic), as well as to native restrictions in the PHP conversion library (GD) which really is still crap at resizing PNG-24 images…

If you want to use “transparent” PNG images (PNG-24), then you upload your image via the WYSIWYG editor (TinyMCE, JCE, JCK Editor etc.).

Thanks for your reading, and if you have any questions with this blog, don’t hesitate to let us know by leaving a comment.