[Bug] GUI Save 2 EXR = LDR image

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Zom-B
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[Bug] GUI Save 2 EXR = LDR image

Post by Zom-B » Mon Oct 12, 2009 12:51 am

Saving from the GUI to a EXR image the 32bit file only contains the 8bit information :?
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Re: [Bug] GUI Save 2 EXR = LDR image

Post by benn » Wed Nov 04, 2009 9:42 am

Really? Comments Nick? Can you attach a .zipped 8-bit exr zomB?

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Re: [Bug] GUI Save 2 EXR = LDR image

Post by pixie » Wed Nov 04, 2009 9:45 am

ZomB wrote:Saving from the GUI to a EXR image the 32bit file only contains the 8bit information :?
I find it odd. My photoshop usually says otherwise.

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Re: [Bug] GUI Save 2 EXR = LDR image

Post by Zom-B » Thu Nov 05, 2009 3:59 am

here is a example EXR file: www.zom-b.de/indigo/exr.zip
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Re: [Bug] GUI Save 2 EXR = LDR image

Post by pixie » Thu Nov 05, 2009 5:12 am

ZomB wrote:here is a example EXR file: http://www.zom-b.de/indigo/exr.zip
It is 32 bits :wink:

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Re: [Bug] GUI Save 2 EXR = LDR image

Post by Zom-B » Thu Nov 05, 2009 5:16 am

pixie wrote:It is 32 bits :wink:
Its I liter of fluid in a Tank Ship m8 8)

8bit of information in a 32bit container...
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Re: [Bug] GUI Save 2 EXR = LDR image

Post by pixie » Thu Nov 05, 2009 5:41 am

ZomB wrote:
pixie wrote:It is 32 bits :wink:
Its I liter of fluid in a Tank Ship m8 8)
I know... what's the program you're using to see it? Try picturenaut

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Re: [Bug] GUI Save 2 EXR = LDR image

Post by Zom-B » Thu Nov 05, 2009 5:55 am

Try for example to Drag & Drop this image into the C4D Image Manager...
in PS the Histogram is shifted too.
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Re: [Bug] GUI Save 2 EXR = LDR image

Post by pixie » Thu Nov 05, 2009 5:59 am

ZomB wrote:Try for example to Drag & Drop this image into the C4D Image Manager...
in PS the Histogram is shifted too.
It comes overexposed but still you can tweak it as you would with a regular 32 bit image. I think that 8bit image couldn't cope with the amount of exposition present on this image.

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Re: [Bug] GUI Save 2 EXR = LDR image

Post by OnoSendai » Mon Nov 09, 2009 1:40 pm

I think it contains all the information, it's just that the pixel values are a lot higher than you're expecting.

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Re: [Bug] GUI Save 2 EXR = LDR image

Post by dcm » Thu Jun 24, 2010 8:22 pm

I found this thread and im pretty sure that zombie is right. Its saving "32 bit" but information is only 8 or its clamped. I need to tweak my render in picturenaut but for example exposure isnt adjustable like in real 32bit image. I tried same scene in fry, i saved 32bit hdr and its working like a charm.
btw 32bit exr from indigo have some black dots...?bug?

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Re: [Bug] GUI Save 2 EXR = LDR image

Post by Zom-B » Wed Jul 14, 2010 2:08 pm

I would like to bump this MAJOR issue by providing some proof.

I simply set up a scene in C4D with a EnvMap and rendered a 32bit EXR in C4D, and one in Indigo, with quite similar (linear) tonemapping. I use the Ennis EnvMap from Paul Debevec, and pointed the cam into the ultra bright window.

Since in Indigo saving file as tonemappedEXR & untonemappedEXR isn't possible anymore through commandLine, I had to use the save as dialog!

First Problem: Indigo only saves Linear Tonemapped EXR with value 1! (maybe whitepoint gets ignored too!!!?!)
Second Problem: the saved image is LDR!

Please, please with sugar on top.... this is a serious feature professionals need to PostPro their work.
its broken since ages and forgotten :(

Feel free to check my example renderings or do own experiments. Maybe this issue is only related to EnvMap lightened images, but it is a issue! Try to save the caterpillar testscene as a EXR for some fun ^^
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LDR_proof.zip
(1.78 MiB) Downloaded 125 times
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Re: [Bug] GUI Save 2 EXR = LDR image

Post by Godzilla » Wed Jul 14, 2010 2:25 pm

Your images certainly have an issue, although I just did an experiment of my own, and it appears to be working correctly on my PC. I'll try and do more subjective tests tomorrow.
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Re: [Bug] GUI Save 2 EXR = LDR image

Post by dcm » Thu Jul 15, 2010 7:32 am

Zombie is right, here you can see. I found 90 minutes and made some tests. Here you can see that Zombie`s renders are correct because in my tests, changing exposure on indigo`s EXR is making picture greyish because of lack of stored data.

PLS CLICK TO FULLSIZE

here is the classic 32bit comparsion between Fryrender`s 32bit output and Indigo`s output.
32bit comparsion.jpg
Here is bug wuth using HDRi as lightning source. Indigo wont to store any data.
32bit comparsion bug.jpg

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Re: [Bug] GUI Save 2 EXR = LDR image

Post by dag » Thu Jul 15, 2010 9:56 am

This is veeery close to what opened in photoshop after saving as exr with envmap only. Didn't get a white or black image. What environment gain did you export with?
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hdri_exr.jpg

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