How To Edit PNG files in Picasa Desktop Tool

 The JPG image option is activated by default in Picasa. But PNG file format is not activated by default therefore to solve the problem, all you need to do is to enable the PNG file format in the options within Picasa. This will enable the PNG file format so that it can be editable in Picasa! Simple! 

Firstly,

1. On the menu bar, click on Tools –> Options.
2. Click on the “File types” tab. You’ll see lots of file types and checkboxes next to them. Check the box next to .PNG option. Similarly if you want to edit .GIF images or any other image type then check the box next to it. Click OK.
3. Now “Edit in Picasa” option is activated. Every time you open the image with Picasa, you’ll find the editing option enabled.