user4234: 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 

user4426: 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:
http://aescripts.com/bad-tv/
An example:




4234: <p>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??</p>

<p>Thank you </p>
 4426: <p>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:</p>

<p><a href="http://aescripts.com/bad-tv/" rel="nofollow">http://aescripts.com/bad-tv/</a></p>

<p>An example:</p>

<p><div class="youtube-embed"><div>
                <iframe width="640px" height="395px" src="https://www.youtube.com/embed/b00Fk9UvRiM?start=0"></iframe>
            </div></div></p>
