How do I resize and convert an uploaded image to a PNG using GD?

Question

I want to allow users to upload avatar-type images in a variety of formats (GIF, JPEG, and PNG at least), but to save them all as PNG database BLOBs

Answer 1

Your process steps should look like this:

1. Verify the filetype
2. Load the image if it is a supported filetype into GD using imagecreatefrom*
3. Resizing using imagecopyresize or imagecopyresampled
4. Save the image using imagepng($handle, 'filename.png', $quality, $filters)

ImageMagick is faster, generates better images, is more configurable, and finally is (IMO) much easier to code for.

@ceejayoz Just wait for the new GD - it's OOP like MySQLi and it's actually not bad :)