Add support for .HDR files from Luminance HDR  

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DrSlony
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Add support for .HDR files from Luminance HDR

by DrSlony » Fri Jul 18, 2014 1:26 pm

Luminance HDR 2.4.0 can save .EXR (OpenEXR) and .HDR (Radiance RGBE) files. APG-3.6.1 seems to show the EXR files correctly, but not the HDR ones - they open completely black in the groups window and in the panorama editor window, though there is data in them and if I right-click on them in APG and select "View image" then I do see the contents.
http://i.imgur.com/LSBi0w0.png

Please add support for them. I have uploaded sample files to the FTP, in lhdr240.zip

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AlexandreJ
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Re: Add support for .HDR files from Luminance HDR

by AlexandreJ » Wed Jul 30, 2014 10:52 am

issue 3710 opened

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Destiny
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Re: Add support for .HDR files from Luminance HDR

by Destiny » Wed Jul 30, 2014 11:01 am

... because its a 32bit HDR which mostly cannot be viewed... unless using specialise software.. Which is kind of strange since APG is supposed to be 32bit.. but is that Output only or Input as well..

I suggest you change the HDR to a 16bit until issue is resolved...

Destiny..

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klausesser
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Re: Add support for .HDR files from Luminance HDR

by klausesser » Sun Aug 03, 2014 1:21 pm

DrSlony wrote:Luminance HDR 2.4.0 can save .EXR (OpenEXR) and .HDR (Radiance RGBE) files. APG-3.6.1 seems to show the EXR files correctly, but not the HDR ones - they open completely black in the groups window and in the panorama editor window, though there is data in them and if I right-click on them in APG and select "View image" then I do see the contents.
http://i.imgur.com/LSBi0w0.png

Please add support for them. I have uploaded sample files to the FTP, in lhdr240.zip



Hey!

It´s definitely not a good idea to open "real" HDR-images in a stitcher for stitching them.

"Real HDR" images are 32bit/ch floating point data. That´s why they have the ability to be used for IBL - Image Based Lighting - in 3D applications like Cinema4D, Maya, Max or some.

They can´t be used like usual image files. So you need to tone-map them for the use in usual pixel-based applications.

"EXR" is a somewhat "simplyfied" data - so to say - providing almost the same capabilities: http://www.openexr.com/

Why would you want to stitch "real" HDR-images anyway?

Klaus

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DrSlony
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Re: Add support for .HDR files from Luminance HDR

by DrSlony » Sun Aug 03, 2014 3:06 pm

Hey

Thank you AlexandreJ.

Destiny wrote:APG is supposed to be 32bit
I don't know what you're quoting exactly, but I wage APG has a complete 32-bit per channel pipeline.

klausesser wrote:Why would you want to stitch "real" HDR-images anyway?
- Most importantly, because you require a stitched HDR image :) For HDRI lighting etc.
In no particular order:
- To save the full panorama straight to a HDR format without requiring HDR creation software.
- For correct global tone-mapping operators. Some tone-mapping operators are strictly local, others are global, in that they require knowledge of the luminance and other parameters of the whole image, which in this case would be the whole panorama, and not a subset of the whole image, which in this case would be a stack.
- Easier workflow assuming your hardware and software can manage a large high bit-depth image.
- Autopano does not reuse blending seams across layers, a very old issue, which means you cannot render layers and merge them to HDR later without having to deal with Autopano-created ghosts (OK, last time I tested this was 3.0 or 3.1, not 3.6.1, but I don't recall seeing info about it in the changelog). Besides, not all HDR creation software supports de-ghosting efficiently or at all.
- Less images and layers in APG,
- etc

Why OpenEXR at all?
- It's open.
- Supports more features than Radiance RGBE, e.g. metadata.
- Other software support.
- Other compression methods.
- http://www.openexr.com/
- http://www.openexr.com/about.html
- https://en.wikipedia.org/wiki/OpenEXR
- http://www.hdrlabs.com/cgi-bin/forum/Ya ... 655637/1#1
- Autopano already supports it, though not in the requested form.
- etc.

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klausesser
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Re: Add support for .HDR files from Luminance HDR

by klausesser » Sun Aug 03, 2014 4:08 pm

DrSlony wrote:
klausesser wrote:Why would you want to stitch "real" HDR-images anyway?
- Most importantly, because you require a stitched HDR image :) For HDRI lighting etc.


Yes - I thought so :cool: .

Ok - i don´t want to bore everybody again with sharing details . . . ;)

Klaus


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