Tobias Porsch | 23 Jul 17:27 2014
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Question about header information of HDRI

Hi,

 

I'm writing you concerning my current project.

I'm working for TechnoTeam company. Manyfacturer of imaging luminance measuring devices (camera photometer).

Our aim is to export our own image file format (pixel-wise HDR float values) into the Radiance rgbe file format.

The aim is to give radiance users access to the measured luminance information combined with our information about lens configuration (geometrical data).

This may of interest for the "glare" community when analyzing the glare using radiance tools.


Anyway, writing the rgbe information is no problem.

 

But what about the header structure of the radiance HDRI format?

I'm a little confused about it and can't find a documentation structure how it is organized?

Unfortunately I'm no radiance user for carrying out own radiance projects to study it?

 

With my best regards

Dipl.-Ing. Tobias Porsch

TechnoTeam Bildverarbeitung GmbH
Werner - von - Siemens - Strasse 5
98693 Ilmenau
----------------------------------------------------------------------------
Email:  tobias.porsch-yK7Zb1w85sPk6LO42iOHOw@public.gmane.org
Phone: +49 3677 4624 0

 

TechnoTeam Bildverarbeitung GmbH

Geschäftsführer: apl. Prof. Dr.-Ing. habil. F. Schmidt

Standort: Ilmenau

Handelsregistereintrag: Jena HRB 300912

 

 

 

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gs33070 | 22 Apr 04:59 2014
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HDRI Digest, Vol 70, Issue 5


I have one more question regarding the calibration:

I am doing daylight research in an office area with alternative 
shadings (artificial lighting is off during the study).
Is using the  Illuminance calibration with the help of handhold 
illuminance meter a correct way of calibrating the  HDR photos In my 
case?

V. Kumaragurubaran and M. Inanici have proposed this method for special 
cases such as sun and sky capture.

Dear Lars:Thank you for your proposed alternatives. Webhdr is a great, 
user friendly tool and I was not aware of that.

Thanks Greg. I've tried to make it short.

Regards
Fatemeh
M.ARCH
UNIVERSITY PUTRA MALAYSIA
gs33070 | 21 Apr 06:16 2014
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Re: HDRI Digest, Vol 70, Issue 4

On Sat, 19 Apr 2014 12:00:00 -0700,
hdri-request@... 
wrote:
> Send HDRI mailing list submissions to
> 	hdri@...
>
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> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of HDRI digest..."
>
>
> Today's Topics:
>
>    1. Re: HDRI Digest, Vol 70, Issue 3 (gs33070)
>    2. Re: HDRI Digest, Vol 70, Issue 3 (Lars O. Grobe)
>
>
> 
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 19 Apr 2014 12:29:04 +0800
> From: gs33070 <gs33070@...>
> To: <hdri@...>
> Subject: Re: [HDRI] HDRI Digest, Vol 70, Issue 3
> Message-ID: <26abe49d1df7e0e4a44888d55c095a43@...>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> On Thu, 17 Apr 2014 12:00:00 -0700, hdri-request@...
> wrote:
>> Send HDRI mailing list submissions to
>> 	hdri@...
>>
>> To subscribe or unsubscribe via the World Wide Web, visit
>> 	http://www.radiance-online.org/mailman/listinfo/hdri
>> or, via email, send a message with subject or body 'help' to
>> 	hdri-request@...
>>
>> You can reach the person managing the list at
>> 	hdri-owner@...
>>
>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of HDRI digest..."
>>
>>
>> Today's Topics:
>>
>>    1. Re: HDR for Glare Analysis (Lars O. Grobe)
>>    2. Re: HDR for Glare Analysis (Gregory J. Ward)
>>
>>
>>
>> 
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Thu, 17 Apr 2014 12:14:35 +0200
>> From: "Lars O. Grobe" <grobe@...>
>> To: High Dynamic Range Imaging <hdri@...>
>> Subject: Re: [HDRI] HDR for Glare Analysis
>> Message-ID: <534FA98B.5040009@...>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> Hi Fatemeh,
>>
>> I do not know wether the dynamic range of the raw images you get 
>> from
>> your camera matches the requirements of what you intend to do with
>> those
>> images. The wide dynamic range in typical daylid scenes led folks
>> here
>> to use exposure series. About the software, I have some doubts that
>> Adobe will tell you about the internals of their HDR code. So it 
>> will
>> be
>> difficult to get support or any information about the meaning of
>> pixel
>> values in the resulting images. Does Adobe claim the resulting HDR
>> images to have physically correct values?
>>
>> Cheers, Lars.
>>
>>> Hi there:
>>> I have a question that concerns HDR photo and Glare analysis.
>>>
>>> Can I use Adobe Photoshop CC (which has the Camera Raw plugin) to
>>> prepare my HDR images?
>>> after that calibrate it with the use of HDRSCOPE that is proposed 
>>> by
>>> Mehlika Inanici. Instead of Photosphere?
>>> Regards
>>> Fatemeh
>>> M.Arch
>>> University Putra Malaysia
>>
>>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Thu, 17 Apr 2014 08:37:18 -0700
>> From: "Gregory J. Ward" <gregoryjward@...>
>> To: High Dynamic Range Imaging <hdri@...>
>> Subject: Re: [HDRI] HDR for Glare Analysis
>> Message-ID: <B3ABE9C2-A524-4067-8C9F-CCED10742082@...>
>> Content-Type: text/plain; charset=us-ascii
>>
>> While you *might* be able to use Adobe's CameraRAW processor to
>> convert the original images to JPEGs, later to be combined using
>> hdrgen or similar, Lars is right that Photoshop itself does not
>> maintain absolute photometric calibration throughout its processing.
>>
>> Adobe actually hired me to improve their HDR image merge process, so
>> CS3 and later (I think) derive a camera curve and maintain correct
>> relative values in the images, similar to Photosphere, but I never
>> convinced Adobe to include calibration information in their output.
>> So, you would need to include a gray card or something whose
>> luminance
>> you measured when you captured the image and use this to correct the
>> final output using a scale factor.  (It is usually a good idea to do
>> this, anyway.)  The procedure for doing this can be found on Mehlika
>> Inanici's site, and also in other posts to this mailing list.
>>
>> Cheers,
>> -Greg
>>
>>> From: "Lars O. Grobe" <grobe@...>
>>> Subject: Re: [HDRI] HDR for Glare Analysis
>>> Date: April 17, 2014 3:14:35 AM PDT
>>>
>>> Hi Fatemeh,
>>>
>>> I do not know wether the dynamic range of the raw images you get
>>> from your camera matches the requirements of what you intend to do
>>> with those images. The wide dynamic range in typical daylid scenes 
>>> led
>>> folks here to use exposure series. About the software, I have some
>>> doubts that Adobe will tell you about the internals of their HDR 
>>> code.
>>> So it will be difficult to get support or any information about the
>>> meaning of pixel values in the resulting images. Does Adobe claim 
>>> the
>>> resulting HDR images to have physically correct values?
>>>
>>> Cheers, Lars.
>>>
>>>> Hi there:
>>>> I have a question that concerns HDR photo and Glare analysis.
>>>>
>>>> Can I use Adobe Photoshop CC (which has the Camera Raw plugin) to
>>>> prepare my HDR images?
>>>> after that calibrate it with the use of HDRSCOPE that is proposed
>>>> by Mehlika Inanici. Instead of Photosphere?
>>>> Regards
>>>> Fatemeh
>>>> M.Arch
>>>> University Putra Malaysia
>>>
>>
>>
>>
>> ------------------------------
>>
>> _______________________________________________
>> HDRI mailing list
>> HDRI@...
>> http://www.radiance-online.org/mailman/listinfo/hdri
>>
>>
>> End of HDRI Digest, Vol 70, Issue 3
>> ***********************************
> Thank you guys for your reply:
>
> I think I will go for Greg solution, including a gray card or 
> something
> whose luminance that I captured the image and use this to correct the
> output using a scale factor.
> I wish there was a Photosphere for windows also.
> cheers
> Fatemeh
>
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 19 Apr 2014 16:25:31 +0200
> From: "Lars O. Grobe" <grobe@...>
> To: High Dynamic Range Imaging <hdri@...>
> Subject: Re: [HDRI] HDRI Digest, Vol 70, Issue 3
> Message-ID: <ECDA05E5-FAF6-417E-A327-945C68564B2F@...>
> Content-Type: text/plain;	charset=us-ascii
>
> Hi Fatemeh,
>
> are you aware of alternatives such as pfstools and webhdr?
>
> Cheers, Lars.
>
>
>
> ------------------------------
>
> _______________________________________________
> HDRI mailing list
> HDRI@...
> http://www.radiance-online.org/mailman/listinfo/hdri
>
>
> End of HDRI Digest, Vol 70, Issue 4
> ***********************************

Dear Lars:

Thank you for your proposed alternatives. Webhdr is a great, user 
friendly tool and I was not aware of that.
I have one more question regarding the calibration.

V. Kumaragurubaran and M. Inanici have proposed two methods for 
calibration. one is based on measuring the absolute luminance of the 
graycard and the other one is based one measuring the illuminance at the 
camera level in the scene that they suggest it for special cases such as 
sun and sky capture.

I am doing daylight research in an office area with alternative 
shadings (artificial lighting is off during the study).
Is using the  Illuminance calibration that utilizes captured 
illuminance of the camera level with the handhold illuminance meter 
(proposed in hdrscope) a correct way of calibrating the  HDR photos In 
my case?

Regards
Fatemeh
M.ARCH
UNIVERSITY PUTRA MALAYSIA
gs33070 | 19 Apr 06:29 2014
Picon

Re: HDRI Digest, Vol 70, Issue 3

On Thu, 17 Apr 2014 12:00:00 -0700,
hdri-request@... 
wrote:
> Send HDRI mailing list submissions to
> 	hdri@...
>
> To subscribe or unsubscribe via the World Wide Web, visit
> 	http://www.radiance-online.org/mailman/listinfo/hdri
> or, via email, send a message with subject or body 'help' to
> 	hdri-request@...
>
> You can reach the person managing the list at
> 	hdri-owner@...
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of HDRI digest..."
>
>
> Today's Topics:
>
>    1. Re: HDR for Glare Analysis (Lars O. Grobe)
>    2. Re: HDR for Glare Analysis (Gregory J. Ward)
>
>
> 
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 17 Apr 2014 12:14:35 +0200
> From: "Lars O. Grobe" <grobe@...>
> To: High Dynamic Range Imaging <hdri@...>
> Subject: Re: [HDRI] HDR for Glare Analysis
> Message-ID: <534FA98B.5040009@...>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hi Fatemeh,
>
> I do not know wether the dynamic range of the raw images you get from
> your camera matches the requirements of what you intend to do with 
> those
> images. The wide dynamic range in typical daylid scenes led folks 
> here
> to use exposure series. About the software, I have some doubts that
> Adobe will tell you about the internals of their HDR code. So it will 
> be
> difficult to get support or any information about the meaning of 
> pixel
> values in the resulting images. Does Adobe claim the resulting HDR
> images to have physically correct values?
>
> Cheers, Lars.
>
>> Hi there:
>> I have a question that concerns HDR photo and Glare analysis.
>>
>> Can I use Adobe Photoshop CC (which has the Camera Raw plugin) to
>> prepare my HDR images?
>> after that calibrate it with the use of HDRSCOPE that is proposed by
>> Mehlika Inanici. Instead of Photosphere?
>> Regards
>> Fatemeh
>> M.Arch
>> University Putra Malaysia
>
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 17 Apr 2014 08:37:18 -0700
> From: "Gregory J. Ward" <gregoryjward@...>
> To: High Dynamic Range Imaging <hdri@...>
> Subject: Re: [HDRI] HDR for Glare Analysis
> Message-ID: <B3ABE9C2-A524-4067-8C9F-CCED10742082@...>
> Content-Type: text/plain; charset=us-ascii
>
> While you *might* be able to use Adobe's CameraRAW processor to
> convert the original images to JPEGs, later to be combined using
> hdrgen or similar, Lars is right that Photoshop itself does not
> maintain absolute photometric calibration throughout its processing.
>
> Adobe actually hired me to improve their HDR image merge process, so
> CS3 and later (I think) derive a camera curve and maintain correct
> relative values in the images, similar to Photosphere, but I never
> convinced Adobe to include calibration information in their output.
> So, you would need to include a gray card or something whose 
> luminance
> you measured when you captured the image and use this to correct the
> final output using a scale factor.  (It is usually a good idea to do
> this, anyway.)  The procedure for doing this can be found on Mehlika
> Inanici's site, and also in other posts to this mailing list.
>
> Cheers,
> -Greg
>
>> From: "Lars O. Grobe" <grobe@...>
>> Subject: Re: [HDRI] HDR for Glare Analysis
>> Date: April 17, 2014 3:14:35 AM PDT
>>
>> Hi Fatemeh,
>>
>> I do not know wether the dynamic range of the raw images you get 
>> from your camera matches the requirements of what you intend to do 
>> with those images. The wide dynamic range in typical daylid scenes led 
>> folks here to use exposure series. About the software, I have some 
>> doubts that Adobe will tell you about the internals of their HDR code. 
>> So it will be difficult to get support or any information about the 
>> meaning of pixel values in the resulting images. Does Adobe claim the 
>> resulting HDR images to have physically correct values?
>>
>> Cheers, Lars.
>>
>>> Hi there:
>>> I have a question that concerns HDR photo and Glare analysis.
>>>
>>> Can I use Adobe Photoshop CC (which has the Camera Raw plugin) to 
>>> prepare my HDR images?
>>> after that calibrate it with the use of HDRSCOPE that is proposed 
>>> by Mehlika Inanici. Instead of Photosphere?
>>> Regards
>>> Fatemeh
>>> M.Arch
>>> University Putra Malaysia
>>
>
>
>
> ------------------------------
>
> _______________________________________________
> HDRI mailing list
> HDRI@...
> http://www.radiance-online.org/mailman/listinfo/hdri
>
>
> End of HDRI Digest, Vol 70, Issue 3
> ***********************************
Thank you guys for your reply:

I think I will go for Greg solution, including a gray card or something 
whose luminance that I captured the image and use this to correct the 
output using a scale factor.
I wish there was a Photosphere for windows also.
cheers
Fatemeh
gs33070 | 16 Apr 07:34 2014
Picon

HDR for Glare Analysis

Hi there:
I have a question that concerns HDR photo and Glare analysis.

Can I use Adobe Photoshop CC (which has the Camera Raw plugin) to 
prepare my HDR images?
after that calibrate it with the use of HDRSCOPE that is proposed by 
Mehlika Inanici. Instead of Photosphere?
Regards
Fatemeh
M.Arch
University Putra Malaysia
Fatemeh Deldarabdolmaleki | 16 Apr 04:57 2014
Picon

HDR for Glare Analysis

Hi there:
I have a question that concerns HDR photo and Glare analysis.

Can I use Adobe Photoshop CC (which has the Camera Raw plugin) to prepare my HDR images?
after that calibrate it with the use of HDRSCOPE that is proposed by Mehlika Inanici. Instead of Photosphere?





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Joshua Wilson | 11 Apr 15:32 2014

Vignetting Correction Using a ULS

Dear List,

I am looking to find a method for correcting vignetting occurring in HDR images using radiance as part of an undergraduate research study. I am using a Uniform Luminance Sphere to create a uniformly lit background in order to create a reference image.

I have used radiance to create the HDR images, and I am wondering if there is a way to take the HDR image and divide each pixel intensity by that of its optical center. This would create an image/mask of fractional pixel values that can be divided into another image to correct for the cameras specific vignetting.

Other suggestions would be greatly appreciated as well.

Thanks,
Josh

--
Joshua Wilson

4th year Architectural Engineering Student (Lighting/Electrical)
Durham School of Architectural Engineering and Construction
UNL College of Engineering (Omaha Campus)
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Leyla Sanati | 10 Mar 15:16 2014
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Re: Does evalglare use climate data for glare analysis?

Hi Nithya,

Evalglare processes the image. You may create annual hourly renderings with climate data, and then use Evalglare to analyze them. 

Leyla


On Fri, Mar 7, 2014 at 9:43 PM, nithya merin <merin7989-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
Hi,

EVALGLARE, Does it use any sort of climate data for glare analysis.

According to my knowledge, it only analysis from an HDR image.
Can anybody confirm this doubt.

Thnakyou
Nithya Merin

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HDRI mailing list
HDRI-mVArnbgP/ra1OXqM+dc5E0B+6BGkLq7r@public.gmane.org
http://www.radiance-online.org/mailman/listinfo/hdri


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nithya merin | 8 Mar 04:43 2014
Picon

Does evalglare use climate data for glare analysis?

Hi,

EVALGLARE, Does it use any sort of climate data for glare analysis.

According to my knowledge, it only analysis from an HDR image.
Can anybody confirm this doubt.

Thnakyou
Nithya Merin
_______________________________________________
HDRI mailing list
HDRI@...
http://www.radiance-online.org/mailman/listinfo/hdri
nithya merin | 6 Mar 06:37 2014
Picon

Does it use climate data for glare analysis?

Hi,

EVALGLARE, Does it use any sort of climate data for glare analysis.

According to my knowledge, it only analysis from an HDR image.
Can anybody confirm this doubt.

Thnakyou
Nithya merin
_______________________________________________
HDRI mailing list
HDRI@...
http://www.radiance-online.org/mailman/listinfo/hdri
Jonghoon Kim | 27 Feb 16:55 2014
Picon

Re: HDRI Digest, Vol 68, Issue 1

I appreciate your comment Axel!!

I slightly modified my code and it is working now.

However, I have one more question!

My HDR process is like below.

(Please, let me know if there is something wrong in my script.)

=====================================================

Cropping the original HDR image to match the size with the vignetting filter file
ra_xyze -r -o -u Original.hdr | pcompos -x 4368 -y 2912 - -408 -272 > Resized_for_Vignetting.hdr

Applying the vignetting filter to the cropped HDRI
pcomb  -e  'ro=ri(1) / ri(2);go=gi(1) / gi(2);bo=bi(1) / bi(2)' Resized_for_Vignetting.hdr Vignetting_Filter.hdr > Vignetting_Corrected.hdr

Resizing the HDRI for glare analysis 
pfilt -x 1200  -y 800 Vignetting_Corrected.hdr > Vignetting_Corrected_resized.hdr

Cropping the HDRI for glare analysis 
ra_xyze -r -o -u Vignetting_Corrected_resized.hdr | pcompos -x 800 -y 800 - -200 0 > Cropped.hdr

Creating the cleaning filter 
ra_tiff -r Cleaning_filter.tif Cleaning_filter.hdr

Applying the cleaning filter on the resized HDRI
pcomb Cropped.hdr -s -1000 Cleaning_filter.hdr > Final.hdr

Running the Evalglare analysis
evalglare -vta -vh 180 -vv 180 Final.hdr

=====================================================

After the process above, The header file  is like below.

#?RADIANCE
CAPDATE= 2014:02:26 22:58:34
GMT= 2014:02:27 04:58:34
/Users/jonghoonkim/Desktop/Sample HDRI/Crop800_800.hdr:
CAPDATE= 2014:02:26 22:51:52
GMT= 2014:02:27 04:51:52
<stdin>:
CAPDATE= 2014:02:26 22:16:03
GMT= 2014:02:27 04:16:03
/Users/jonghoonkim/Desktop/Sample HDRI/Big_for_Vignetting.hdr:
CAPDATE= 2014:02:26 22:09:29
GMT= 2014:02:27 04:09:29
<stdin>:
CAMERA= Canon Canon EOS 60D version v.0
Photosphere created HDR image from 'Jong_-2014-0111-1104-14.jpg' 'Jong_-2014-0111-1104-17.jpg' 'Jong_-2014-0111-1104-20.jpg' 'Jong_-2014-0111-1104-22.jpg' 'Jong_-2014-0111-1104-25.jpg' 'Jong_-2014-0111-1104-28.jpg' 'Jong_-2014-0111-1104-31.jpg' 'Jong_-2014-0111-1104-34.jpg' 'Jong_-2014-0111-1104-37.jpg' 'Jong_-2014-0111-1104-40.jpg' 'Jong_-2014-0111-1104-44.jpg' 'Jong_-2014-0111-1104-48.jpg' 'Jong_-2014-0111-1104-53.jpg'
VIEW= -vtv -vh 132.979172 -vv 113.747666
CAPDATE= 2014:01:11 12:05:53
ra_xyze -r -o -u "/Users/jonghoonkim/Desktop/Sample HDRI/Big.hdr"
PRIMARIES= 0.6400 0.3300 0.2900 0.6000 0.1500 0.0600 0.3333 0.3333
pcompos -x 4368 -y 2912 - -408 -272
/Users/jonghoonkim/Desktop/Sample HDRI/Sigma_f56FishVigL.hdr:
# Output from HDRShop
EXPOSURE=          1.0000000000000
pcomb -e "ro=ri(1) / ri(2);go=gi(1) / gi(2);bo=bi(1) / bi(2)" "/Users/jonghoonkim/Desktop/Sample HDRI/Big_for_Vignetting.hdr" "/Users/jonghoonkim/Desktop/Sample HDRI/Sigma_f56FishVigL.hdr"
pfilt -x 1200 -y 800
ra_xyze -r -o -u "/Users/jonghoonkim/Desktop/Sample HDRI/Resize.hdr"
PRIMARIES= 0.6400 0.3300 0.2900 0.6000 0.1500 0.0600 0.3333 0.3333
pcompos -x 800 -y 800 - -200 0
/Users/jonghoonkim/Desktop/Sample HDRI/Cleaning_filter.hdr:
ra_tiff -r
CAPDATE= 2014:02:25 16:15:37
pcomb "/Users/jonghoonkim/Desktop/Sample HDRI/Crop800_800.hdr" -s -1000 "/Users/jonghoonkim/Desktop/Sample HDRI/Cleaning_filter.hdr"
FORMAT=32-bit_rle_rgbe


=====================================================

The header file is very long like above after the whole process.

I could run evalglare with the final.hdr. ( It looks OK until now.) 

Is the header file is OK for futhur HDRI analysis?

Are there any potential error source in the head?

If I need to modify the head, can you explain a little bit more on vim and Radiance’s info?


Have a good day!

Best regards,
Jonghoon Kim




On Feb 26, 2014, at 2:00 PM, hdri-request <at> radiance-online.org wrote:

Send HDRI mailing list submissions to
hdri-mVArnbgP/ra1OXqM+dc5E0B+6BGkLq7r@public.gmane.org

To subscribe or unsubscribe via the World Wide Web, visit
http://www.radiance-online.org/mailman/listinfo/hdri
or, via email, send a message with subject or body 'help' to
hdri-request-mVArnbgP/ra1OXqM+dc5E0B+6BGkLq7r@public.gmane.org

You can reach the person managing the list at
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of HDRI digest..."


Today's Topics:

  1. Crop HDRIs in radiance and evalglare (Jonghoon Kim)
  2. Re: Crop HDRIs in radiance and evalglare (Axel Jacobs)


----------------------------------------------------------------------

Message: 1
Date: Wed, 26 Feb 2014 09:33:10 -0600
From: Jonghoon Kim <jonghoon7kim-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: hdri-mVArnbgP/ra1OXqM+dc5E0B+6BGkLq7r@public.gmane.org
Subject: [HDRI] Crop HDRIs in radiance and evalglare
Message-ID: <A0E6E05A-7825-41EB-AB33-B5A85BBD5625-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Content-Type: text/plain; charset="us-ascii"

Dear list,

I am trying to glare analysis via HDR images captured by a canon DSLR Camera and sigma fish eye lens.

The procedure that I use was

1. Taking 13 images via gphoto2 +Crontab

2. Creating HDR images in HDRgen

3. Resize
pfilt -x 1433  -y 955 Big.hdr > resize.hdr

4.Crop & cleaning mask
ra_xyze -r -o -u resize.hdr | pcompos -x 800 -y 800 - -315 -78 > crop.hdr | pcomb -s -1000 output_masked2.hdr

5. Evalglare analysis
echo "VIEW= -vta -vh 180 -vv 180 -vp 0 0 0 -vd 1 0 0 -vu 0 0 1" > output_masked2.hdr
evalglare output_masked2.hdr

The problem is that Evalglare reports errors after the crop process.

error: no valid view specified

(There was no evalglare errors when I test it with the resized image.)

I has checked the luminance values of the HDR in photosphere and it looks OK!

Do I need to use another crop command for evalglare processing?

Please, let me know if you have any ideas.

Best regards,
Jonghoon Kim
Ph.D. student
Texas A&M University



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Message: 2
Date: Wed, 26 Feb 2014 16:25:28 +0000
From: Axel Jacobs <jacobs.axel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: High Dynamic Range Imaging <hdri-mVArnbgP/ra1OXqM+dc5E0B+6BGkLq7r@public.gmane.org>
Subject: Re: [HDRI] Crop HDRIs in radiance and evalglare
Message-ID:
<CA+dqh61Y+UOkSAzp1mE9frpGydXKLK8zJh6vPmsCaBA-9FHJzQ-JsoAwUIsXotQFR93xxRIaA@public.gmane.orgcom>
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Both pcompos and pcomb mess with the HDR header. Also, what you are doing here:

echo "VIEW= -vta -vh 180 -vv 180 -vp 0 0 0 -vd 1 0 0 -vu 0 0 1" >
output_masked2.hdr

is overwrite HDR image output_masked2.hdr with just the view string.
You need to edit this image in a text editor and put a full VIEW= line
back in.  If you're happy using vim, then you could try Radiance's
vinfo.

Regards

Axel


On 26 February 2014 15:33, Jonghoon Kim <jonghoon7kim-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
Dear list,

I am trying to glare analysis via HDR images captured by a canon DSLR Camera
and sigma fish eye lens.

The procedure that I use was

1. Taking 13 images via gphoto2 +Crontab

2. Creating HDR images in HDRgen

3. Resize
pfilt -x 1433  -y 955 Big.hdr > resize.hdr

4.Crop & cleaning mask
ra_xyze -r -o -u resize.hdr | pcompos -x 800 -y 800 - -315 -78 > crop.hdr |
pcomb -s -1000 output_masked2.hdr

5. Evalglare analysis
echo "VIEW= -vta -vh 180 -vv 180 -vp 0 0 0 -vd 1 0 0 -vu 0 0 1" >
output_masked2.hdr
evalglare output_masked2.hdr

The problem is that Evalglare reports errors after the crop process.

error: no valid view specified

(There was no evalglare errors when I test it with the resized image.)

I has checked the luminance values of the HDR in photosphere and it looks
OK!

Do I need to use another crop command for evalglare processing?

Please, let me know if you have any ideas.

Best regards,
Jonghoon Kim
Ph.D. student
Texas A&M University




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