• Adobe After Effects

  DOF with lens blur makes dark borders

  Posted by Andy Weil on June 21, 2009 at 9:44 am

  Hello.

  Q1:

  I have some 1920 x 1080 footage and want to make DOF with the lens blur filter. Problem: At the edges of the picture I get a dark border in the blurred parts (width depends on depth of effect).

  How can I get rid of this without scaling it up?

  The same in 1280 x 720 doesn´t make this problem.

  Second question: I´m not very happy with the built in lens blur effect. Frischlufts lenscare for instance actually does a better job but it´s a bit expensive. Does someone know any alternatives?

  Thx in advance,

  Andy

  WinXP Prof. / AE 7.0 Prof.

  Andy Weil replied 17 years, 1 month ago 2 Members · 7 Replies
• 7 Replies

• 

  Jim Dodson

  June 21, 2009 at 4:04 pm

  Can’t help you with the second question, but to get rid of the border problem click on the “repeat edge pixels”

  Jim Dodson

  8 Core Intel — Mac – OSX
• 

  Jim Dodson

  June 21, 2009 at 7:55 pm

  Hmmm….

  Which version of After Effects are you using? I’m CS3 AE Version 8 (Mac OS X)… And it is the last checkbox in the effects window…

  Jim Dodson

  8 Core Intel — Mac – OSX
• 

  Andy Weil

  June 21, 2009 at 8:01 pm

  Thank you Jim.

  “Repeat edge pixels” is an option of fast blur and it also would make sense here – unfortunately lens blur does not support this feature (or I can´t find it?!?).

  Any ideas besides that?

  Thanks, Andy
• 

  Andy Weil

  June 21, 2009 at 9:09 pm

  As I already wrote, I´m using AE 7.0 Prof.

  And it is the last checkbox in the effects window…

  Are you sure? Here it´s “Stretch Map to Fit”…

  Andy
• 

  Jim Dodson

  June 22, 2009 at 8:14 pm

  Here’s a SUPER-Silly workaround:

  Make a 2nd copy of your footage using Fast blur with repeat edge pixels.
  Put that layer below the lens blurred layer. Now the Fast blur layer will fill in in the areas of partial opacity…

  It’s a silly workaround but it “works” — I just tried it…

  btw,
  Just to confirm Andy, AE CS3 lens blur does have repeat edge pixels…

  Jim Dodson

  8 Core Intel — Mac – OSX
• 

  Andy Weil

  June 22, 2009 at 8:16 pm

  No idea anybody?
  So it seems I have no option but scaling it up a bit.

  Thanks, Andy
• 

  Andy Weil

  June 22, 2009 at 8:59 pm

  Hi.

  Now the Fast blur layer will fill in in the areas of partial opacity…

  Hey, you´re right – the dark border is transparent! Crazy!
  Yes – I´ll just fill it with a fast-blured copy of the layer!

  You made my day, thanks Jim! 🙂

  Just to confirm Andy, AE CS3 lens blur does have repeat edge pixels…

  Good to know, thanks for looking.

  Cheers and have a nice day!

  Andy

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