gs33070 | 19 Apr 06:29 2014
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Re: HDRI Digest, Vol 70, Issue 3

On Thu, 17 Apr 2014 12:00:00 -0700,
hdri-request@... 
wrote:
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> Today's Topics:
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>    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@...>
(Continue reading)

gs33070 | 16 Apr 07:34 2014
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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
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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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nithya merin | 8 Mar 04:43 2014
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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
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nithya merin | 6 Mar 06:37 2014
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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
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Jonghoon Kim | 27 Feb 16:55 2014
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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:

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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>
Content-Type: text/plain; charset=ISO-8859-1

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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End of HDRI Digest, Vol 68, Issue 1
***********************************

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Jonghoon Kim | 26 Feb 16:33 2014
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Crop HDRIs in radiance and evalglare

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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Chris Kallie | 31 Jan 19:13 2014
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SMP file busy problem on iterative rendering in Linux

Dear Radiance Users,

I've assembled a simple script that iterates through a folder containing 
octrees, and renders using SMP. On Mac, everything works as expected. 
However, on Linux, I get errors suggesting both the syncfile and ppfile 
are still locked by the OS. I've attempted two solutions, including 
adding 'sleep 5' after pfilt (first attempt, shown below), and then by 
externalizing the while loop, with an ending 'exit 0' (second attempt, 
not shown here), but neither approach fixed the problem.

Here is one version of code which works on Mac but not in Linux:

for file in obj/*.oct
do
     filename="${file%.*}"
     rm -f syncfile argsfile ppfile
     echo 1 64 > syncfile
     cat syncfile
     echo -F syncfile  <at> arguments -vf room.vf -o $filename.unf 
$filename.oct > argsfile
     cat argsfile
     NCPU=2
     while [ "$NCPU" -gt 0 ]
     do
         echo "running proc $NCPU"
         rpiece -v -PP ppfile   <at> argsfile &
         sleep 5
         NCPU=`expr $NCPU - 1`
     done
     wait
     echo "Filtering File - $filename.unf"
     pfilt -1 -e -2 -m .25 -r .6 -x /3 -y /3 $filename.unf > $filename.hdr
     sleep 5
     rm -f syncfile argsfile ppfile
done

Interestingly, I do not get an error saying "cannot remove 'argsfile' ". 
After the first image is successfully rendered, I get the following 
errors at each successive iteration, indicating the rm only works once 
(line 4) in the first iteration:

rm: cannot remove 'syncfile': Text file busy
rm: cannot remove 'ppfile': Text file busy
rm: cannot remove 'syncfile': Text file busy
rm: cannot remove 'ppfile': Text file busy

Since the error isn't fatal, the machine keeps rendering, and ends up 
rendering the same (first) image over and over. Has anyone run into this 
problem and found a solution? Any advice would be greatly appreciated.

Thanks,
Chris
María Beatriz Piderit | 20 Jan 19:36 2014
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mksource and IBL

Hi all,

 

I’m trying to extract a concentrated light source from HDR picture of the sky using mksource.

I run the following script:

oconv materials.mat geometry.rad lightprobe.rad > scene.oct

mksource -d 1000000 -t 2 -a 5 scene.oct > srcs.rad

oconv -i scene.oct srcs.rad ground.rad > finalscene.oct

rpict -vth -vv 180 -vh 180 -vp 1.8 3 1.2 -vd 1 1 0 finalscene.oct > finalsceneview.hdr

ra_tiff finalsceneview.hdr finalsceneview.tif

Do you have any idea what is wrong? a problem with  the capture of the sun? or rather a matter of parameters ?

Is it normal that mksource finds several sources ? (see https://www.dropbox.com/s/n7y97ppm1ip1gky/srcs.rad)

 

Thanks in advance for your help !

Beatriz Piderit M.
Arquitecta UBB, MA, PhD UC Louvain

Departamento Diseño y Teoría de la Arquitectura
Universidad del Bio-Bio Concepción, Chile

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