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Thomas Richter | 11 Jan 20:15
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Conditions for OpenEXR example images

Dear Sirs,

under which conditions does ILM release the OpenEXR example images found 
http://www.openexr.com/downloads.html? Background for this question is 
the following: As a member of the German delegation of the JPEG 
committee (ISO SC29/WG01) I'm currently looking into the evaluation of 
floating-point based high-dynamic range compression algorithms. However, 
finding suitable test material turned out to be quite hard. OpenEXR and 
the openEXR sample images look like an excellent source the JPEG should 
consider - however the licensing conditions of the posted images are 
unfortunately not clear enough to allow this right away.

Hence, I'm kindly asking you under which conditions it is acceptable to:

o) use the images as test material for internal testing in the ISO only
and/or

o) use the images as test material in scientific publications?
and/or

o) reprint the images as part of a scientific publication?

Could you provide me with a contact point who could provide definite 
answers for the above questions?

Best regards, and greetings from the University of Stuttgart, Germany,

Thomas Richter
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Thomas Richter | 11 Jan 20:36
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Re: Conditions for OpenEXR example images

Hi Greg,

> You should also consider Mark Fairchild's HDR Photographic Survey:
> 
>     http://www.cis.rit.edu/fairchild/HDR.html
> 
> I'm not sure of the licensing restrictions, but I assume since Mark 
> intends these to be a kind of reference for tone-mapping work, that they 
> are fairly generous.

Thanks for the pointer! I'm clearly aware of Mark's work - and actually 
I'm already testing with his images. (-: Unfortunately, I found the 
dynamic range of his images not quite high enough to really justify 
floating point - most of the images can be evaluated by LDR methods 
(unlike the ILM content) and thus is data is not quite "critical enough" 
for my intension.

Nevertheless, thanks!

Thomas
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Thomas Richter | 11 Jan 21:12
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Re: P.S.

Greg Ward wrote:
> I have improved versions of Mark's images, regenerated from the RAW 
> input using dcraw and hdrgen.  Mark used Photoshop CS2 to create his 
> HDR, and there are issues with their calibration resulting from that.

Well, if we can use those for testing, I would be definitely interested.

> Also, are you folks looking to evaluate JPEG-HDR in your comparisons?  I 
> can provide you with the library if you like.

You mean the 12bpp option in "traditional" JPEG? Well, sure, but not in 
this test - that's done already - I'm currently looking into floating 
point support, and for that into images that really need more range than 
12bpp could address.

I do have the IJG code, which supports 12bpp lossy as a compile-time 
option (unfortunately, somewhat buggy, but fixable); I suppose this is 
what you mean?

Thanks,
	Thomas
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Thomas Richter | 11 Jan 21:16
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Re: Conditions for OpenEXR example images

Mihai Draghicioiu wrote:
> wow, are you talking HDR JPEGs here? =OOO
> 
> awesome!!

Yes, we are - though less into the "old" JPEG, though this is also part 
of the tests whenever possible (not really for float, though). Quality 
assessment of compression algorithms in this domain is still somewhat 
experimental, and I'm looking into material suitable for such tests.

So long,
	Thomas
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Chris Cox | 12 Jan 17:44
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Re: Re: P.S.


I believe he is referring to JPEG-HDR, not (unused, rarely implemented) 12 bit JPEG.

See Greg's publications on the matter for more details.

Chris

On 1/11/09 12:12 PM, "Thomas Richter" <thor <at> math.tu-berlin.de> wrote:

Greg Ward wrote:
> I have improved versions of Mark's images, regenerated from the RAW
> input using dcraw and hdrgen.  Mark used Photoshop CS2 to create his
> HDR, and there are issues with their calibration resulting from that.

Well, if we can use those for testing, I would be definitely interested.

> Also, are you folks looking to evaluate JPEG-HDR in your comparisons?  I
> can provide you with the library if you like.

You mean the 12bpp option in "traditional" JPEG? Well, sure, but not in
this test - that's done already - I'm currently looking into floating
point support, and for that into images that really need more range than
12bpp could address.

I do have the IJG code, which supports 12bpp lossy as a compile-time
option (unfortunately, somewhat buggy, but fixable); I suppose this is
what you mean?

Thanks,
        Thomas
(Continue reading)

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Piotr Stanczyk | 12 Jan 18:41
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Re: Conditions for OpenEXR example images

Hi Thomas,

Thanks for your interest; I have forwarded your questions to out legal 
department for clarification on your points.

Piotr

Thomas Richter wrote:
> Dear Sirs,
>
> under which conditions does ILM release the OpenEXR example images 
> found http://www.openexr.com/downloads.html? Background for this 
> question is the following: As a member of the German delegation of the 
> JPEG committee (ISO SC29/WG01) I'm currently looking into the 
> evaluation of floating-point based high-dynamic range compression 
> algorithms. However, finding suitable test material turned out to be 
> quite hard. OpenEXR and the openEXR sample images look like an 
> excellent source the JPEG should consider - however the licensing 
> conditions of the posted images are unfortunately not clear enough to 
> allow this right away.
>
> Hence, I'm kindly asking you under which conditions it is acceptable to:
>
> o) use the images as test material for internal testing in the ISO only
> and/or
>
> o) use the images as test material in scientific publications?
> and/or
>
> o) reprint the images as part of a scientific publication?
(Continue reading)

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Thomas Richter | 12 Jan 20:27
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Re: P.S.

Gregory J. Ward wrote:
> Hi Thomas,
> 
>>> I have a DVD I can send you -- it's 4 GBytes of data, so a bit too
>>> much for my website.
>> I could provide an upload to an sftp server (actually, the JPEG sftp
>> server for test material) if this suits you fine?
> 
> I don't particularly want to commit my laptop to 3+ hours of upload.  Do 
> you need this right away, or can it wait a week or so?

It can definitely wait for a week - I'm traveling the next week (JPEG 
meeting in SF) - so I won't be able to perform much experiments. A DVD 
would be fine as well.

>>> Actually, I was referring to Dolby Canada's format -- not very well
>>> advertised, obviously.  It's a backwards-compatible extension to
>>> standard JPEG for HDR content, described in the following CIC 2005 
>>> paper:
>>>
>>>     http://www.anyhere.com/gward/papers/cic05.pdf

Thanks for this work - I had the time to go through it, I like it, and I 
find a lot of good starting points for further research.

>>> The maximum capacity of this extension is about 9 or 10 orders of
>>> magnitude, so I'm not sure it fits with your priorities, but I can
>>> provide you with the libraries if you want to include it in your
>>> evaluations.
>> If possible, sure. However, libraries for which operating system? Since
(Continue reading)

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Gmane