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 Are there any tricks to speed up dof for large pics? 
vermu


Joined: 24 Jul 2006
Posts: 1
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Hi,

I do alot of pring work and found out that dof is alot slower when dealing with 3508*2480 pics. Are there any tricks how to handle large images with dof?

-Juha
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martinvicanek


Joined: 23 Oct 2005
Posts: 49
Location: Germany
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Juha,

the rendering time is roughly proportional to the image area (number of pixels) times the aperture area. So if you have a large image and process it with a large aperture, DOF PRO will take its time. We have spent a great deal of effort to optimize DOF PRO for performance but there are limits to that if you don't want to compromise quality.

Greetings
Martin

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Martin Vicanek
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wgwild


Joined: 06 Sep 2006
Posts: 3
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I guess the answer to my question would be the same. I have a 2448X3264 jpg file that is 2.29 meg. I have created an 8 bit Depth Map bmp from this which explodes to a whopping 22.86 megs. It takes about 2 hours to render the DOF result. This is frustrating considering you can't really tell what the end result will be until it has finished (The preview is too small to really get an accurate idea). Sny suggestions to speed this up?

Bill : Sad
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richardrosenman
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Joined: 23 Oct 2005
Posts: 145
Location: Canada
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Hi Bill;

DOF PRO has a "Res" feature which will process every n'th line of an image. You can set the Res to something lower such as 1:5 and although you'll get a blocky DOF result, it can serve as a faster approximation of what your final will appear like.

When you have a result that looks good, simply set the Res back to 1:1 and hit OK.

-Richard

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Richard Rosenman
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wgwild


Joined: 06 Sep 2006
Posts: 3
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So am I correct that 2 hours rendering time is acceptable even when I have 2 gb of RAM? Can the file size of the DM be reduced somehow to speed things up

Bill
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richardrosenman
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Joined: 23 Oct 2005
Posts: 145
Location: Canada
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Hi Bill;

The file size of the depth map will do nothing to speed up the processing. While 2 hours may seem excessive, a raytraced 3D DOF effect on an image that large would take several days to render. It's all relative depending on what type your work is.

Martin said it best when he explained that processing time increases exponentially when you increase the aperture size. In most cases, you will want to keep that to a minimum since real-world DOF is rarely severe. However, in the cases where you absolutely need extreme DOF, a fast CPU with plenty of ram will do you justice.

We're exploring trying to get dual-core CPU's to work with DOF PRO but this seems to be partially a PS restriction rather than a plugin one.

DOF PRO is coded to output the best possible DOF effect. As a result, speed is often a sacrifice. However, all of our customers prefer quality over speed and of course, we will continue to develop DOF PRO to process images for print and film faster, and even better.

-Richard

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Richard Rosenman
DOF PRO Developer
Digital Animation Director
http://www.dofpro.com
http://www.mblpro.com
http://www.cgsphere.com
http://www.hatchstudios.net
http://www.lumierefilter.com
http://www.richardrosenman.com
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