Tone mapping?

General questions about Indigo, the scene format, rendering etc...
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contegufo
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Tone mapping?

Post by contegufo » Mon Jan 11, 2016 6:05 am

Hi

Tone mapping.
I would like to know what criteria you choose Linear, Camera or Reinhard.
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Zom-B
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Re: Tone mapping?

Post by Zom-B » Mon Jan 11, 2016 6:36 am

I never use Indigos tonemapping since you'll get cropped to 8 bit per channel by that.
Saving the untonemapped EXR and processing this full range 32bit render output in After Effects in my way to go.
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Oscar J
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Re: Tone mapping?

Post by Oscar J » Mon Jan 11, 2016 7:01 am

I use Camera tonemapping simply because I think it looks the best, and because you can vary the look of the render quite a lot with the different camera options, some of which can give your image a whole new feel.

Normally I use one of the lower contrast ones though, and do most adjustments in PS.

I can't for the life of me understand why Indigo doesn't output 16 bit TIFF's. Not a big fan of 32 bit editing, so 16 bit should give me significantly more dynamic range to work with.

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contegufo
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Re: Tone mapping?

Post by contegufo » Mon Jan 11, 2016 7:35 am

Hi

I use Camera / Agfapan apx400cd or Reinhard depending on the scene by varying the values until it is not to my liking.
Then a pass into the PH levels and unsharp mask.
I like the scene that gives a feeling of warm.
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Re: Tone mapping?

Post by Stinkie » Mon Jan 11, 2016 9:06 am

Oscar J wrote:I can't for the life of me understand why Indigo doesn't output 16 bit TIFF's.
Me neither. 8)

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Zom-B
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Re: Tone mapping?

Post by Zom-B » Mon Jan 11, 2016 9:13 am

Oscar J wrote:I can't for the life of me understand why Indigo doesn't output 16 bit TIFF's.
Don't let me start with that... The first request is just 4 (!!!) years old, and all my attempts to bring that topic on failed since then:
http://www.indigorenderer.com/forum/vie ... =5&t=11365
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Oscar J
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Re: Tone mapping?

Post by Oscar J » Mon Jan 11, 2016 9:50 am

-.-

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Zalevskiy
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Re: Tone mapping?

Post by Zalevskiy » Mon Jan 11, 2016 1:50 pm

Hi

I use Camera / agfapan apx400cd | dscs315_2

to eliminate the gradient use this Action — http://nomorebanding.com/

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Re: Tone mapping?

Post by zeitmeister » Mon Jan 11, 2016 7:21 pm

Cool Technique!!!


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ak-sam
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Re: Tone mapping?

Post by ak-sam » Fri Mar 31, 2017 10:16 am

Folks I'd love to know what settings to use for the most accurate colour reproduction.

I sometimes prepare 'streetscape renders' which are flat elevations of a row of houses - we need to demonstrate colours and materials used on the houses. The coloures are defined in the model (sketchup) using RGB values. Sometimes materials are used for brick, etc.

Reinhard, Camera, Linear and Filmic all look good .......but which is the MOST accurate? Eg in the final rendered image, I want colours to be as close to their RGB source as possible.
I haven't gone and compared final renders to the colour swatches in a detailed way but it seems like Linear with Exposure 0.6 is pretty accurate.

Also I usually have to show shadows (45-degree) so i use the sketchup sun/sky ...this will affect things.

Thanks!
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Zom-B
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Re: Tone mapping?

Post by Zom-B » Fri Mar 31, 2017 7:23 pm

Linear Tonemapping is the one you are looking for.
But a perfect colour match will be not that easy, since Indigo converts the colour from RGB > Spectral > RGB.
Each of these steps isn't a perfect match, good but not perfect and not Indigos fault, but simply smart people still haven't found a perfect transition between these Ranges...
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Eneen
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Re: Tone mapping?

Post by Eneen » Fri Mar 31, 2017 8:07 pm

Linear gives perfect color as @Zom-B said, but unfortunatelly will badly clip highlights. When you alter tone curve during post-production like using S-curve, hues will change, mainly blue and yellow. To get perfect hues you either need use LUTs, correct every hue range by hand or use hue preserving curve like film-like from rawtherapee (implemented from adobe). I output always linear files, as they allow all possible adjustments. With tone-mapped files from renderer you are not able to correct adjust exposure.

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Re: Tone mapping?

Post by Zom-B » Fri Mar 31, 2017 9:02 pm

Eneen wrote:Linear gives perfect color as @Zom-B said, but unfortunatelly will badly clip highlights.
Save untonemapped EXR for full 32bit Range and no Clipping.
Eneen wrote:With tone-mapped files from renderer you are not able to correct adjust exposure.
Yes, all other modes do clamp the result, even in a tonemapped EXR in 32bit range, thats the "nature" of tonemapping...
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Re: Tone mapping?

Post by Eneen » Fri Mar 31, 2017 9:41 pm

Zom-B wrote:Save untonemapped EXR for full 32bit Range and no Clipping.
My bad here, I should have written "clip visually in unpleasant way". Sure, linear exr gives full dynamic range.

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