What's the easiest/best way to change all white pixels to transparent in a saved image file?
For example, I've got a .png file of a (black on white) signature which was created using the Snipping Tool in Windows 7. However, whenever I apply it to a document (eg Word, PowerPoint, etc) by clicking Insert > Picture > Filename, it comes as a block with the white portions obscuring whatever is behind it.
I'd like to modify it somehow so that only the non-white pixels are inserted and all of the white area is transparent.
I've got MS Paint of course and also Inkscape but not Photoshop, etc. I've looked up a couple of webpages re creating transparent images in Inkscape and although I've followed the instructions they've included, I must be doing something wrong because the resulting files are not transparent.
I can upload the .png file or one that's similar if that would be helpful.