[Digikam-users] digiKam and floating point tiffs and openexr files

[Gilles Caulier]

2015-12-31 20:42 GMT+01:00 Elle Stone <ellestone at ninedegreesbelow.com>:

> On 12/31/2015 01:52 PM, Gilles Caulier wrote:
>
>>
>>
>> 2015-12-31 19:44 GMT+01:00 Elle Stone <ellestone at ninedegreesbelow.com
>> <mailto:ellestone at ninedegreesbelow.com>>:
>>
>>     Krita, GIMP 2.0/2.10, Blender, the raw processors darktable and
>>     PhotoFlow, and also other image editing software have the capacity
>>     to open and save 32-bit floating point tiffs and/or openexr files.
>>
>>     I've accumulated a lot of such files in the course of editing
>>     images, to the point where I'd like to find an image viewer for
>>     browsing through the images and then opening selected images with
>>     various high bit depth image editing programs.
>>
>>     As far as I can tell, digiKam can't read floating point tiffs and
>>     also can't read openexr files. Would filing a bug report/enhancement
>>     request be worthwhile?
>>
>>
>> digiKam use a 16 bits color depth integer image data container to edit,
>> which will solve 99% of photography case, including RAW files.
>>
>> floating point image data are very specific case, typically used in pro
>> video for ex.
>>
>
> In the past, yes. But I suspect that over the next couple of years more
> and more photographers and digital artists will be editing 32-bit floating
> point images.
>
>
>> You can load this kind of image in digiKam image editor through QImage
>> loader, but in 8 bits per color per pixels. that all.
>>
>>
>>     It would be nice if digiKam could be used to not only view but also
>>     catalog and tag such images.
>>
>>
>> Cataloging/tagging, etc, is not a problem here. Metadata management is
>> delegate to Exiv2, which support TIFF, but not OpenEXR as i know. In all
>> case XMP side car is the solution here. Also, no problem with database
>> with these kind of image formats.
>>
>
> I put some sample files of various formats in a folder cataloged by
> digiKam, and refreshed the folder, and also closed and reopened digiKam:
>
> The openexr file and the Krita KRA file both failed to show in digiKam.
>
> The floating point tiff and the GIMP 2.9 XCF file both showed up, but
> without any actual image being displayed.


For all of this, this is deleguate to KDE imgio Qt plugins. This package
(from kdegraphics if i rememeber) must be installed.


>
>
>
>>
>>     It would be extremely nice if digiKam could also be used to catalog
>>     and tag high bit depth GIMP XCF files and also Krita KRA files.
>>
>>
>> Supporting other color depth that 16 bits will be complex and long to
>> solve.
>>
>
> Currently digiKam sort of supports PhotoShop PSD files, at least ones that
> were saved using maximum compatibility. By "support" I mean a thumbnail is
> shown in digiKam.
>
> Would an embedded thumbnail of some sort maybe make it easier to enable
> support in digiKam for showing Krita KRA files and/or GIMP XCF files, not
> for editing with showFoto but rather displaying a thumbnail for cataloging
> and tagging with digiKam?


See my previous comment.

Gilles Caulier
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