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 Speed Issue 
enzym


Joined: 15 May 2008
Posts: 3
Location: Sydney
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Hi guys + Richard,

I just tried DOF Gen Pro for the 1st time. I tried it on Large size photos (from Canon EOS30D). I just setup the option to simple Radial Gradient, and then I set the aperture size to really high (90+ up), but I realize the processing takes really looong... is this normal? Sorry for asking the same topic, I am looking for latest information/improvement.

I did then reduce the file size 25% of the original and then apply it again. It took me around 5-10 minutes to get complete result (for 1-2 megapixels photo). The result is nice, but I am a bit worried about the processing time, it is very expensive. I almost thought that Photoshop was freezing.

Was wondering which of options will affect the quality vs speed? I did a search and found few information regarding the same issue. But I was wondering, does it really need that long time to render out a single DOF? I think Renderman for Maya did the DOF around the same time (with highest quality).

I will definitely do some more testing and experiment and hopefully I could find a better workaround of this speed/performance issue.

Cheers.
- Jim
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enzym


Joined: 15 May 2008
Posts: 3
Location: Sydney
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...and just to add, before anyone replying to this topic.

For Circular Gradient, Photoshop could actually do the similar type of Lens Blur with less time cost (by a lot). Even in `more accurate` mode. Where does the benefit of lens blur over Photoshop's own Lens Blur?

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

A DOF value of 90 is extremely high and this will certainly require a long time to calculate.

The main factor in rentime is how much DOF you introduce. Most people tend to add more DOF than is actually required and this not only increases rendertimes significantly, but also makes your subject look 'miniature'.

Of course, we're always trying to improve rendertime but for the time being be careful not to add more DOF then is necessary.

-Richard


Last edited by richardrosenman on Mon May 19, 2008 3:55 am; edited 1 time in total

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enzym


Joined: 15 May 2008
Posts: 3
Location: Sydney
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Ah, that is right. I guessI should be more careful with DOF high value. I did actually want to have this unnatural `miniature` feel or bended lens effect ala Lens Baby. It's unfortunate about the time cost. Anyway, I will do the 'chess' tutorial first to understand the workflow.

Thanks for the info, Richard.

- Jim
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