convert a pgm image to jpg Matlab -

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i'm trying convert image found here pgm image jpg can't. i've tried answer of question found here didn't work. so, if please advise.

the problem in file-header: 

pf 640 480 9757

according wikidepida , this man page file should use p2 (for graymap) instead of pf (which seems invalid in cases):

p2 640 480 9757

with little change (made in text editor) file opens fine.


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