Is there a way to access an Image's bitmap data using Javascript?

Question

I am looking for a way to create a hash for an image displayed on an XHTML page using Javascript.

I know that I can use Flash in order to access the BitmapData information. But I'd really like to do it with JavaScript alone. — webwise, Jun 10 '09 at 14:44

score 1 · Accepted Answer · edited May 23 '17 at 12:19

1

edited May 23 '17 at 12:19

Community

answered Jun 10 '09 at 08:37

Matthew Flaschen

Thanks, but I'd wish to access an already parsed bitmap data of an image file. Do you have any ideas? – webwise Jun 10 '09 at 14:25
No. The actual data should be cached, but you would have to reparse the image in JS. – Matthew Flaschen Jun 10 '09 at 14:56
You should probably stick with the XMLHttpRequest, it is your most likely solution. – defines Jun 28 '09 at 12:46

score 1 · Answer 2 · answered Jun 10 '09 at 08:53

1

On supported browsers you could use a canvas element to get at image data. Get started with this Mozilla article on pixel manipulation.

answered Jun 10 '09 at 08:53

Paul Dixon

Thanks, but I need to support IE as well. Any ideas? – webwise Jun 10 '09 at 14:26

2 Answers2