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2013-07-20 21:03:51 +0100 received badge  Teacher (source)
2013-07-19 05:37:04 +0100 answered a question high resolution image - matplotlib

You can refer to this online image processing tutorial to see the image resolution solutions, with the mature image resolution adjust methods.

2013-07-11 01:27:28 +0100 answered a question png image within a Graphics object

You can try a image processing toolkit for adding axes, lines or circleswhich of cause should support the PNG manipulation.

2013-07-04 00:48:25 +0100 answered a question Howto output plot to pdf, eps or svg ?

If the saveing function cannot work well, you can try to use a pdf converter control to transfer pdf to plot, beside to plot, pdf to html or image is also allowed..