Canvas image data is changed when sent to server

StackOverflow https://stackoverflow.com/questions/22172870

题

Following image will help in understanding this question.

enter image description here

The text in Notepad is at client side. And the text in the window titled "Value" is on server side.

If you note, in first line after "2WAAA" text is getting changed. Why is this happening ?

this following code is xhtml: enter image description here

and this is javascript, using which we found out text in notepad enter image description here

没有正确的解决方案

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