How to convert the background to transparent?
Quick solution without downloading anything is to use online editors that has "Magic Wand Tool".
I would recommend this (just found via search):
- http://lunapic.com/editor/?action=load
- Browse for image to upload OR enter URL of the file (below the image)
http://i.stack.imgur.com/2gQWg.png - Edit menu/Transparent (last one)
- Click on the red area
- Behold :) below is your image, it's just white triangle with transparency...
[dragging the image around in your browser for visibility,
the gray background and the border is not part of the image]
- File menu/Save Image
GIF/PNG/ICO image file formats support transparency, JPG doesn't!
If you want a command-line solution, you can use the ImageMagick convert utility:
convert input.png -transparent red output.png
Paint.net is a free photo-editing tool that allows for transparent backgrounds. There is a simple example on YouTube http://www.youtube.com/watch?v=cdFpS-AvNCE. If you are still on Windows XP SP2 and that's an issue, I would first recommend doing the free service pack upgrade. But if that is not an option there are older versions of Paint.net that you could download and try.