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How can I convert a png file using terminal or maybe a Python script to a jpg without artifacts; here's what I did and image was malformed: cat.png: enter image description here

jalal@klein:~$ convert cat.png cat.jpg

jalal@klein:~$ eog cat.jpg

enter image description here

jalal@klein:~$ convert cat.png -quality 95 cat_95.jpg
jalal@klein:~$ eog cat_95.jpg

enter image description here

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Not helpful to your question (and I'm glad someone found a solution to the problem!), but I'll just note that the problem you've discovered could be a cool basis for glitch art. – r_alex_hall Nov 11 '17 at 13:44
up vote 2 down vote accepted

It looks like you are suffering from issues due to the alpha channel in your PNG.
You can remove this and replace with a background of you choice using the following command:

convert cat.png -background white -alpha remove cat.jpg
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wow!! Smart! so much thanks! imgur.com/a/E7hmk – Mona Jalal Oct 18 '16 at 18:12

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