Fix double split-text issue causing incorrect filename truncation

[santoshray02]

Resolved an issue where using split-text twice resulted in incorrect truncation of filenames containing multiple dots. For instance, a file named '2018_01_Items_1-2-2018-2191.30.jpg' was being improperly shortened to '2018_01_Items_1-2-2018-2191.jpg'.

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[gaotongxiao]

Thanks for your contribution. The fix is still not quite elegant as it would never remove file extension, and the output filename would become something like "1.jpg.jpg".

A better way is to keep all the filename split except for the last one:

out_file = '.'.join(osp.splitext(img_name)[:-1])

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