Stylize edges of an image

[Maxene5CC4]

Hello all! I'm looking to make a similar effect as the image in this picture where the edges look a little torn. Could someone tell me how to do this? My searches haven't brought up anything. 

 

[Ton Frederiks]

Place your image.

Click Mask.

Select a stroke weight/color.

Select Effects > Path > Outline Stroke

Apply Effect > Distort & Transform > Roughen.

Change the stroke color to the background color if nessecary.

[Ton Frederiks]

You can skip the whole stroke/outline stroke.

Just select the image, click mask and apply roughen.

[Maxene5CC4]

So helpful! Thanks so much for walking me through each step. I'm pretty new to Illustrator, so I'm still trying to figure this stuff out...

[jdanek]

There are a few different ways.  One is to use the Roughen filter ( start with a line and apply the Roughen filter, may take some experimentation to achieve what you want ).  You could also build a mask with the two vertical ines roughened and the two horizontal lines straight ( join four separate elements to create a rectangle > then create a mask ).  If your background is a color, just match the color in the lines' stroke in step one above.