https://bugzilla.wikimedia.org/show_bug.cgi?id=17505
Summary: No High Dynamic Range Image (HDRI) file formats allowed
on Commons
Product: Wikimedia
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: Normal
Component: General/Unknown
AssignedTo: [email protected]
ReportedBy: [email protected]
Currently, open HDR image file formats (Radiance HDR, OpenEXR) are not
supported on Wikimedia Commons (see
http://commons.wikimedia.org/wiki/Commons:File_types). It is important to allow
users to upload images in one or both of these file formats, for the following
reasons:
* HDRI is a rapidly developing field, and it is expected that HDR images will
become far more common in the following years.
* To my knowledge, there are no HDR images on the web which have been published
under a free license, nor are they allowed by Flickr. Allowing HDR images would
be a great opportunity for Commons to establish itself as the main source for
them.
* At the moment, we only have a category for tonemapped HDR images
(http://commons.wikimedia.org/wiki/Category:HDR_images). Most of these images
were obviously generated using a bad tone mapping operator or simplistic image
processing techniques, as can be seen from the halo artefacts. With HDR images,
users could not only recover the full dynamic range of photos and computer
graphics, and change the exposure without any loss, but also use any tone
mapping operator they want.
One issue is the preview/downscaled image to provide. I suggest that the
preview/downscaled image be generated from the HDR image using a robust tone
mapping operator, such as Ward's histogram adjustment technique
(http://radsite.lbl.gov/radiance/papers/lbnl39882/tonemap.pdf).
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