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I want to store the Image into my Server side Database. Once the user draw using canvas and hit a Submit button , Canvas Element should be converted to image format and then I want to store that Image into my database for further use. I can use this image to verify the user next time he visits my site.
Can anyone help me to sort it out? My server code is written in Java Servlets
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Saving HTML canvas as an image is pretty easy, it can be done by just right-clicking on the canvas and save it as an image.
Getting image data from a canvas We use getImageData() to extract a slice of the image, starting at (10, 20) , with a width of 80 and a height of 230 . We then draw this slice three times, positioning the slices progressively below and to the right of the last slice.
The HTML <canvas> element is used to draw graphics, on the fly, via scripting (usually JavaScript). The <canvas> element is only a container for graphics. You must use a script to actually draw the graphics. Canvas has several methods for drawing paths, boxes, circles, text, and adding images.
Use Canvas.toDataURL() which will return a string with a base64 encoded PNG. You can then store it as a normal text or decode and save as a file. To put it back on canvas you simply pass this string as a source for Canvas.draw(source, 0, 0) method
Fiddle for you: http://jsfiddle.net/9a7Xd/
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