Help me import edited 'versions' of images from Picasa

[g0rak 1]

Hey Gilles,

Thank you for replying.  I checked out the namespace link but it didn't
give any info on what are the acceptable names for the filters.  For the
source code however I could at least what the other filter categories are,
such as 'doucmentedHistory.

Based on this, can I just make up my own filter name, and provide no
parameters?

E.g. below I have made a filter named 'picasa:Picasa', display name 'Edited
by Picasa', filter version '1', with a category 'documentedHistory'.

<?xml version="1.0"?>.
<history version="1">.
  <file uuid="4d13dbbff40ae5501c42e6314b8b8f52" type="original">.
    <fileParams fileName="20170103_094034.jpg"
filePath="/Users/simon/Photos/2016/Holiday/"
fileHash="8838978dccc24c1763b6996fe94bb019" fileSize="4401586"
creationDate="2017-01-03T09:40:34"/>.
  </file>.
  <filter filterName="picasa:Picasa" filterDisplayName="Edited by Picasa"
filterVersion="1" filterCategory="documentedHistory">.
    <params>.
    </params>.
  </filter>.
</history>.

If you think it is acceptable to make up filter names, then I will be happy
to give this a try.

Kind regards,

Simon

On 7 February 2017 at 05:09, Gilles Caulier <caulier.gilles at gmail.com>
wrote:

> Hi,
>
> The versionning is stored in XMP digiKam namespace :
>
> http://www.exiv2.org/tags-xmp-digiKam.html
>
> Look ImageHistory tag.
>
> In source code, the method which export history to XML data is this one :
>
> https://cgit.kde.org/digikam.git/tree/libs/dimg/
> imagehistory/dimagehistory.cpp#n491
>
> An example of exported history is given below (with resize tool used) :
>
> $ exiv2 -px DSC03712_1.JPG
> Xmp.tiff.Software                            XmpText    13  digiKam-4.2.0
> Xmp.tiff.ImageWidth                          XmpText     3  800
> Xmp.tiff.ImageLength                         XmpText     3  533
> Xmp.xmp.CreatorTool                          XmpText    13  digiKam-4.2.0
> Xmp.exif.PixelXDimension                     XmpText     3  800
> Xmp.exif.PixelYDimension                     XmpText     3  533
> Xmp.digiKam.ImageHistory                     XmpText   1647  <?xml
> version="1.0"?>
> <history version="1">
>     <file uuid="e854d7e092d41bc00c1e537af3e729
> 6dafe85809797bbf3f3ff93a48b8d07a5d" type="original">
>         <fileParams filePath="/" fileHash="afe85809797bbf3f3ff93a48b8d07a5d"
> fileSize="12812288" creationDate="2014-07-13T14:52:45"/>
>     </file>
>     <filter filterName="digikam:LocalContrastFilter"
> filterDisplayName="Local Contrast Filter" filterVersion="2"
> filterCategory="reproducible">
>         <params>
>             <param name="functionId" value="0"/>
>             <param name="highSaturation" value="100"/>
>             <param name="lowSaturation" value="100"/>
>             <param name="randomSeed" value="2940933007"/>
>             <param name="stage[0]:blur" value="11"/>
>             <param name="stage[0]:enabled" value="true"/>
>             <param name="stage[0]:power" value="30"/>
>             <param name="stage[1]:enabled" value="false"/>
>             <param name="stage[2]:enabled" value="false"/>
>             <param name="stage[3]:enabled" value="false"/>
>             <param name="stretchContrast" value="true"/>
>         </params>
>     </filter>
>     <file uuid="9265806dd2ed9a362fdd2d9d83da1d
> 3cafe85809797bbf3f3ff93a48b8d07a5d">
>         <fileParams fileName="DSC03712.JPG" filePath="/Users/gilles/
> Pictures/Photos/SALAGOU/2014-07-13/" fileHash="
> fdb610f5d23b875e575d7fb3d32df0b1" fileSize="4562194"/>
>     </file>
>     <filter filterName="transform:resize" filterDisplayName="Resize"
> filterVersion="1" filterCategory="reproducible" branch="true">
>         <params>
>             <param name="height" value="533"/>
>             <param name="width" value="800"/>
>         </params>
>     </filter>
> </history>
>
> Xmp.digiKam.ImageUniqueID                    XmpText    64
> a50d3eaae1bc5da03c0c7d159bb30649fdb610f5d23b875e575d7fb3d32df0b1
>
> Gilles Caulier
>
>
> 2017-02-06 10:29 GMT+01:00 g0rak 1 <g0rak01 at gmail.com>:
>
>> Hey all,
>>
>> I'm new to Digikam and looking to move from Picasa.  I've been impressed
>> by Digikam's non-destructive versioning and want to use it to retain my
>> Picasa edits by:
>>
>> - exporting all edited photos from Picasa
>> - adding '_v1' to their filenames
>> - adding Digikam's versioning XML to 'ImageHistory' field in the XMP tag
>> of each edited image
>>
>> Digikam should then link the edited version with the original, and then
>> hide the original in the thumbnail browser as the original 'version'.
>>
>> Does anyone know where I can find the specification for Digikam's
>> versioning XML, so I can work out how to write my own XML into the images?
>> I can see the basic structure after performing a resize etc., but ideally I
>> want to keep things simple and record each edited version as 'Edited by
>> Picasa' without having to work out what the edit actually was.
>>
>> I'm not sure if it's possible to define a generic 'version' in the XML
>> without specifying a 'filter' and 'parameters' (e.g. a resize with
>> coordinates, etc.), but would like to find out.
>>
>> If I can get this to work I will happily share my script with the
>> community as there might be others looking to move from Picasa who would
>> like to maintain their edits alongside their originals.
>>
>> Thanks for your help,
>>
>> Simon
>>
>>
>>
>
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