After Effects .png sequence mask feather

Forgive me if this question is in the wrong place, I am new to this forum.
I have a .png sequence in AE (animation comprised of png files as frames). I use this format since the built in alpha channel/mask/transparency allows me to create composite images with blurred background/foregrounds (mimicking depth of field).
Basically the edges are too 'crisp' and I would like to feather them. I am used to working with masks but I havn't used the .png format for animation until now.
If I were in Photoshop I would simply select the layers pixels, create mask, feather the edge and voila. But I can't seem to access this png mask in after effects. Any help greatly appreciated. Thanks!

Thanks for the quick reply. I seem to remember that about png's from a first year class
Well my footage comes from a cg application and there are too many frames to manage in photoshop (unless there is a macro or batch script).
So there is no way to feather the transparency in AE (or premiere pro)?
As a last resort I suppose I can render an alpha channel as a separate sequence an use that.
Sent from my iPhone

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Adobe After Effects v12.0 (Windows 64) render log for project “Untitled Project.aep”
Rendering started on 11/8/2014 at 9:34:58 AM
11/8/2014 9:34:58 AM: Starting composition “cinematicsPre 2”.
Render Settings: Best Settings
Quality: Best
Resolution: Full
Size: 1702 x 953
Proxy Use: Use No Proxies
Effects: Current Settings
Disk Cache: Read Only
Color Depth: Current Settings
Frame Blending: On for Checked Layers
Field Render: Off
Pulldown: Off
Motion Blur: On for Checked Layers
Solos: Current Settings
Time Span: Work Area
Start: 0:00:04:10
End: 0:00:25:27
Duration: 0:00:21:19
Frame Rate: 30.00
Guide Layers: All Off
Skip Existing Files: Off
Output Module:Lossless
Output To:C:\Users\Matthew\Desktop\Youtube Stuff\ObeyRC\Sequence\1\cinematicsPre 2_[#####].png
Format: PNG
Output Info: -
Start Frame: 130
Output Audio: -
Channels: RGB
Depth: Millions of Colors
Color: Premultiplied
Resize: -
Crop: -
Final Size: 1702 x 953
Profile: -
Post-Render Action: None
0:00:04:10 (1): 3 Seconds
0:00:04:11 (2): 1 Seconds
0:00:04:12 (3): 1 Seconds
0:00:04:13 (4): 1 Seconds
0:00:04:14 (5): 1 Seconds
0:00:04:15 (6): 1 Seconds
0:00:04:16 (7): 1 Seconds
0:00:04:17 (8): 1 Seconds
0:00:04:18 (9): 1 Seconds
0:00:04:19 (10): 1 Seconds
0:00:04:20 (11): 1 Seconds
0:00:04:21 (12): 1 Seconds
0:00:04:22 (13): 1 Seconds
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0:00:04:24 (15): 1 Seconds
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0:00:04:27 (18): 1 Seconds
0:00:04:28 (19): 1 Seconds
0:00:04:29 (20): 1 Seconds
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After Effects .png sequence mask feather

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