I try this, but I don't succeed. Is there a posibility to save that object or their values and then use it , e.g. for a redraw?
Saving context.getImageData to a sessionStorage with html5?
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Instead of saving the image data array (which is uncompressed), I would suggest using
Canvas.toDataURLto get a base64-encoded PNG for the canvas, and saving that string.Later, you can draw this data URL to your canvas.