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I'm learning After Effects from scratch so sorry if this is obvious but whenever I try to make one part of an image 'glitch' I create a section of the image and place it in the middle but when I press play my desired glitch (JPG noise) does appear but black pixels appear outside the selected area of the image, anyone got any idea how I can stop this??

Thank you

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Your question is not very clear to me. Could you maybe add a link to a video (uploaded by you, or an existing one) showing the desired effect and you're problem? This would greatly help answering the question. – Saaru Lindestøkke Jun 16 '13 at 23:26

I think you should use the "Bad TV" plugin to achieve this effect. It has a setting to glitch images, and make them look as though the encoding has broken:

An example:

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