Cropping

I've looked around and so far I haven't found help with the subject of cropping. I've got a sprite sheet and so far pressing the crop button does absolutely nothing for me. I tried separating the sprites in the sprite sheet and then cropping but I still end up with a white background on my sprites. It's really frustrating but is there a certain procedure to crop a sprite image?

This one in particular <img src="http://i1124.photobucket.com/albums/l569/Aiko_Khongten/Hero.jpg" border="0" />

What image editor are you using?

I think at the moment, if you're saving your images to any other format than RGBA PNG, then matting and other artefacts can be a problem.

I was trying Construct 2's image editor but looks like I had to change the image to PNG and crop it with an external program. That's a little bothersome though. Will cropping the sprite sheet have to be done externally as well?

The crop function reduces the amount of empty space around the image. It isn't doing anything for you because it removes transparent pixels rather than those with colour, I assume, so it thinks that the white is part of your sprite sheet.

To get rid of the white you'll need to make it transparent in an image editor.