Hi folks,
not that it matters much for daylighting .... but out of curiosity -
has anyone written a converter from Radiance images to jpeg which tries to convert the meta information in an hdr file as much as possible to EXIF headers of jpeg ?
("ra_ppm | cjpeg" works for sure, but the meta info is lost; exiv2 could be used to put it back in via shell script, sure)
Handling it directly would be neat, wouldn't it ? , if just for keeping track of images and their history, plus some translatable camera parameters like effective focal length, details displayed by getinfo. EXIF is quite rich in tags, see http://www.exiv2.org/tags.html and this metadata seems to be well supported by images browsers , search engines and the like - if one wants to disclose the details, which on webserver is doubtful, but in a local archive useful.
just wondering-
best,
Peter
···
--
pab advanced technologies Ltd, http://www.pab.eu
Hi Peter,
While the Exif header is a nice place to access such data and isn't that difficult to read, it's a real pain to write out. The only tool I know of that does so robustly is exiftool, which is free and well-documented. You can build a script around it such that you use the "ra_ppm | cjpeg" followed by a call to exiftool to insert the desired tags into the output. It works quite well.
Cheers,
-Greg
···
From: Peter Apian-Bennewitz <[email protected]>
Date: April 12, 2013 7:11:09 AM PDT
Hi folks,
not that it matters much for daylighting .... but out of curiosity -
has anyone written a converter from Radiance images to jpeg which tries to convert the meta information in an hdr file as much as possible to EXIF headers of jpeg ?
("ra_ppm | cjpeg" works for sure, but the meta info is lost; exiv2 could be used to put it back in via shell script, sure)
Handling it directly would be neat, wouldn't it ? , if just for keeping track of images and their history, plus some translatable camera parameters like effective focal length, details displayed by getinfo. EXIF is quite rich in tags, see http://www.exiv2.org/tags.html and this metadata seems to be well supported by images browsers , search engines and the like - if one wants to disclose the details, which on webserver is doubtful, but in a local archive useful.
just wondering-
best,
Peter
Hi,
yeap, as mentioned, exiv2 can be used for that: getinfo ... | awk -f somemagic.awk | exiv2 -m ... file.jpg
Workable, doesn't even need a compiler, but dissects information from text which is available, first hand and neatly structured, in c-code reading hdr/pic images.
Anyway- whatever fits.
-Peter
···
On 04/12/13 17:45, Gregory J. Ward wrote:
Hi Peter,
While the Exif header is a nice place to access such data and isn't that difficult to read, it's a real pain to write out. The only tool I know of that does so robustly is exiftool, which is free and well-documented. You can build a script around it such that you use the "ra_ppm | cjpeg" followed by a call to exiftool to insert the desired tags into the output. It works quite well.
Cheers,
-Greg
From: Peter Apian-Bennewitz<[email protected]>
Date: April 12, 2013 7:11:09 AM PDT
Hi folks,
not that it matters much for daylighting .... but out of curiosity -
has anyone written a converter from Radiance images to jpeg which tries to convert the meta information in an hdr file as much as possible to EXIF headers of jpeg ?
("ra_ppm | cjpeg" works for sure, but the meta info is lost; exiv2 could be used to put it back in via shell script, sure)
Handling it directly would be neat, wouldn't it ? , if just for keeping track of images and their history, plus some translatable camera parameters like effective focal length, details displayed by getinfo. EXIF is quite rich in tags, see http://www.exiv2.org/tags.html and this metadata seems to be well supported by images browsers , search engines and the like - if one wants to disclose the details, which on webserver is doubtful, but in a local archive useful.
just wondering-
best,
Peter
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