Change image extension on submission I am using D7.12 with webform 3.18. I want to change the image extension from png to jpg of the image uploaded through the form before saving it to database. I tried mytheme_webform_submission_presave() in template.php but didn't help me. How can I do this?
You need to use imagecache actions module to auto convert images from one extension to other.

Module Project page tells it provides


  File Format switcher - If you need tranparency in JPGs : make them
  PNG. If your PNG thumbnails are 30K each, save them as JPGs. (This is
  distributed as part of the color-actions submodule)