[Digikam-users] Re: duplicate hashes in digikam 1.7 database

[Elle Stone]

Oz, here's the bug report:
https://bugs.kde.org/show_bug.cgi?id=262452. It is a duplicate of
https://bugs.kde.org/show_bug.cgi?id=210353, which is fixed in digikam
2.0.

Marie-Noëlle, my problem tiffs also were generated by UFRaw. The
problem seems to be that digikam generates a hash for each image only
based on the first little bit of the image. UFRaw puts all the raw
file metadata into its tiffs, so the hash doesn't get far enough into
the image to get unique information. Hashes generated over the entire
image are unique, but apparently that would take too long to do when
pulling images into a database.

digikam 2.0 will pull a bit of info from the beginning and end of each
image (which still seems to leave open the possibility of duplicate
hashes if one is in the habit of producing a series of images with
minute variations, but that is just speculation).

In the meantime, I used exiftool to remove all the metadata from the
UFRraw-produced tifs, and the metadataless tifs did provide unique
hashes. I wonder if you'd get a unique hash if you added a bit of
unique metadata to each tif - haven't tried that yet.

Elle

On 1/8/11, Ozzy <ozzyprv at gmail.com> wrote:
> I have encounter the same problem with some thumbnails.
> When you have a chance, could you please pass along the bug #?
> Thank you.
>
> Oz.
>
> On Fri, Jan 7, 2011 at 11:29 PM, Marie-Noëlle Augendre <mnaugendre at gmail.com
>> wrote:
>
>>
>>
>> 2011/1/7 Elle Stone <l.elle.stone at gmail.com>
>>
>>> Marie-Noëlle, Jim - I thought I had seen other people mention having
>>>
>>> the wrong thumbs on certain images. Maybe there is more than one cause
>>> of an incorrect thumb. In this case, no other program has touched the
>>> images since the test database was created, and nothing has been
>>> renamed.
>>>
>>>
>> In my case, no program 'outside' Digikam has touched the photos.
>> It was always related to RAW pictures I have treated with UFRaw, called
>> from within Digikam.
>>
>> Marie-Noëlle
>>
>>
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>