balance your lights as a postprocess without rerendering

zuegs · Post by **zuegs** » Fri Nov 17, 2006 1:21 am

Hello Indigo-users

Haven't you waited for hours for a nice render and then realised that one light is to bright or another to dark ? And you asked yourself if you have to rerender tho hole scene?
Wouldn't it be nice to correct light-energie in post-process?

You can do this with indigo

, it's a bit more setup work but render times are about the same. You have to create and render a scene-XML for every light-group. Ensure that you create untonemapped-EXR output files of this renders. This untonemapped-EXR files you can compose/blend them together in a appropriate software. There you can set the gain of each render to balance your lights. After the blend you just need to do the final tonemapping / gamma-correction and your done

Here a small example of a scene with 3 light-groups. This 3 renders have cooked for 5min each and the final composed image is comparable with a 15min render

Post by **OnoSendai** » Fri Nov 17, 2006 1:24 am

Cool idea Zuegs...
did you make this program?

zuegs · Post by **zuegs** » Fri Nov 17, 2006 1:35 am

Yes, i started it to correct vertical perspectiv distortion for indoor scenes (rise and fall correction) directly on EXR files. Now just added some mixing features to do above stuff

Xman · Post by **Xman** » Fri Nov 17, 2006 1:37 am

Look very cool

Is this your software?

zuegs · Post by **zuegs** » Fri Nov 17, 2006 1:58 am

Yes, i programmed my own EXR-shop

called "yellow" (analog to Indigo)

But you can do the blending/mixing with Photoshop... you just need the OpenEXR plugin

Xman · Post by **Xman** » Fri Nov 17, 2006 2:12 am

The name " yellow" sound very good

Will you give indigo" yellow"?Combine usage.

zuegs · Post by **zuegs** » Fri Nov 17, 2006 2:50 am

I can't bind the OpenEXR librarys in the EXE and so it needs 5 dynamic openEXR dlls to run

... so it's still ugly

. Some one knows about a delphi library for openEXR ?

zsouthboy · Post by **zsouthboy** » Fri Nov 17, 2006 2:51 am

Download link?

Did you get the idea from Maxwell, by any chance? I do happen to love that feature of it, I render both day and night versions at once.

EDIT: ah, you're working on it. got it.

and...

eww, delphi.

zuegs · Post by **zuegs** » Fri Nov 17, 2006 3:04 am

Yes I read about it on Maxwell webpage some time ago... and more i worked with indigo i thought about that it could realy be useful

but it's just a basic idea and not elegant in use but perhaps it could be a idea for some peoples

Pinko · Post by **Pinko** » Fri Nov 17, 2006 3:35 am

Very cool Zu !!!!!!!!!

Pinko.

Big Fan · Post by **Big Fan** » Fri Nov 17, 2006 7:10 am

edited to remove all

zuegs · Post by **zuegs** » Fri Nov 17, 2006 8:23 am

Hi Pinko, hi Big-Fan

Thanks, will try to finish the soft, as it isn't yet reasonable working

I thought about the exporter too, it's possible to automaticly create the different XML files (grouped by material-name of lights). What's missing is the render-queue that automaticaly renders all scenes parallely or each a fixed time long. Has someone some good ideas about it

Big Fan · Post by **Big Fan** » Fri Nov 17, 2006 9:17 am

edited to remove all

BZ Win · Post by **BZ Win** » Sat Nov 18, 2006 6:56 am

This is too cool, but surprise! I got a question!

I have the open EXR plugin, how do I go about blending in photoshop?

psor · Post by **psor** » Sat Nov 18, 2006 7:13 am

BZ Win wrote:...
I have the open EXR plugin, how do I go about blending in photoshop?

Hmm, as far as I know this (more than 16bit per channel) is not yet possible in PS ... I'm sorry ...*sigh*

take care
psor

balance your lights as a postprocess without rerendering

balance your lights as a postprocess without rerendering

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