Disable to download image from canvas

Question

I added image to canvas element, but visitor than can save that image to local comp. Is there any way to disable that option? I don\'t know, putting some transparent image o

Answer 1

None of this (not even image slicing) stops a user from simply copying the screen on to the clipboard and pasting it into MSpaint or any other image utility, and saving the result. Its trivial to do; And a transparency image is no impediment to this.

The only effective options that I know of are (as was said), watermarking or low quality. *Avoid 1 pixel wide lines or dot watermarks that can be removed easily with a Photoshop filter.

~If its commercial... You could have a pay-wall, and steganographically embed the purchaser's name and or information into the image (or preview), such that if it does get used without permission, at least you know who did it.