but when I try to run in my computer the little example of the website:
... then what exactly happens? That's the most interesting part, and the thing you left out.
(Please also read What shortcuts can I use for linking to other information?).
Update: I looked at the strace output, and it seems that the image is written to a temporary file first, and only later copied or moved to its destination path. So you should check if the permissions of your tmp directory are ok, and if you have space left on that device.
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Want more info? How to link
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