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2013-07-20 14:03:51 -0500 received badge  Teacher (source)
2013-07-18 22:37:04 -0500 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.

2013-07-10 18:27:28 -0500 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.

2013-07-03 17:48:25 -0500 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..