So....where did the white edge come from?
I've downloaded those icons, and, using the method I described above get this result:
[ATTACH]48191[/ATTACH]
On the LEFT is without cropping...no white.
On the right is cropped, proving no transparent pixels....apart from what should be.
These are png's, jpeg does NOT support transparency.
I don't know what you've done but if you follow my method above you will get the same.
To be on the safe side IGNORE cropping the icon, just remove the transparent pixels by the method I've explained.
Put the icon into the app and take a screen shot of it in use.
Post your icon (As saved from PS) AND the screen shot of the icon.
Regards.
MrTom.
PS...
Technically, no.
Digital images consist of pixels and have no linear measurement.
PS, for this reason, also works in pixels, not meters.