Hello again, Thank you all for the many hints. I tried it out and it works now. But anyhow I have a following problem now.
When I do insert the following lines to the header for the description of our used angular fish eye lens, radiance tools like 'evalglare' (the author is J. Wienhold) does calculate wrong results. #?RADIANCE FORMAT=32-bit_rle_rgbe VIEW= -vta -vv 180 -vh 180 -vp 0 0 0 -vd 0 0 1 -vu 0 1 0 EXPOSURE=1.79e+02 -Y 1040 +X 1392 I do assume this is due to the fact that the circular field of view for our fish eye is just a part of the rectangular aspect ratio of the image. For example the center of the circular view is x = 700px; y = 500px and the diameter = 450px. Is it possible to tell this within the header? Another possibility could be to crop the image according to this circular field of view. Is this possible? Kind regards Tobias Von: Gregory J. Ward [mailto:[email protected]] Gesendet: Mittwoch, 23. Juli 2014 17:57 An: High Dynamic Range Imaging Betreff: Re: [HDRI] Question about header information of HDRI Well, you asked at the right place! The Radiance header format is simple, a set of newline ('\n') separated comments, some of which are of the form: VARIABLE=value A space may appear after the equals ('=') but rarely/never appears before it. Other lines in the header do not have this form, and may be anything. However, the first line identifying the file should be: #?RADIANCE The "RADIANCE" portion above is traditional, whereas the "#?" sequence is the so-called "magic number" for Radiance pictures. Below is a typical information header: #?RADIANCE CAMERA= NIKON CORPORATION NIKON D700 version Ver.1.03 Photosphere created HDR image from '_DSC7719.JPG' '_DSC7720.JPG' '_DSC7721.JPG' '_DSC7722.JPG' '_DSC7723.JPG' '_DSC7724.JPG' '_DSC7725.JPG' '_DSC7726.JPG' '_DSC7727.JPG' EXPOSURE=4.887013e-03 VIEW= -vtv -vh 51.765083 -vv 71.303574 OWNER= Greg Ward CAPDATE= 2014:02:25 09:49:32 GMT= 2014:02:25 08:47:39 LATLONG= 46.948730 7.451972 FORMAT=32-bit_rle_rgbe ------ The header is terminated by an empty line (two newlines together "\n\n"). The following line after the empty line is very important, it contains the image resolution. It is typically in the form: -Y ysiz +X xsiz where xsiz and ysiz are the integer number of pixels in the image. This ASCII string is terminated by another newline ('\n'), immediately followed by the raster image data in the order indicated, Y (vertical) major sort, with Y values decreasing as measured from the bottom-left of the image. This is explained in more detail in the relevant section (pp. 28-35) of the Radiance file formats document, located here: http://radsite.lbl.gov/radiance/refer/filefmts.pdf I see Lars has provided you with the same information. I hope this is enough to get you started. Please note the importance of the EXPOSURE= line in the header and the 179 lumens/watt standard conversion factor in creating a properly calibrated picture. Let me know if you have further questions. Best, -Greg From: Tobias Porsch <[email protected]<mailto:[email protected]>> Subject: [HDRI] Question about header information of HDRI Date: July 23, 2014 8:27:01 AM PDT 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: [email protected]<blocked::mailto:[email protected]> 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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