[Digikam-devel] [Bug 125387] Simulate changes to images only

[Gilles Caulier]

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http://bugs.kde.org/show_bug.cgi?id=125387         




------- Additional Comments From caulier.gilles free fr  2006-09-03 20:04 -------
Let's me explain my recent investiguations about Nikon Capture NX beta:

This program can be used to manage RAW .NEF file format from Nikon camera. There is a great future to perform changes in RAW image without changing original image data in file. The idea is to use the metadata to store a list of actions in editor to perform when the image is opened later.

A NEF file is just tagged with new binary data used by the software to store the actions list. This is require only some Kb !

In digiKam, this can be done like this :

1/ Adapted the actions management core from editor to identify each action by an ID and a list of option availabe for each tools (core action and image plugins).
2/ Fix all editor tools to use the new actions management interface.
3/ Added a new option in editor to save action list to perform in picture.
4/ Using a metadata tag to store a list of actions. IPTC can help us : there is normally free-for-use tags for that. We can use XMP later when Exiv2 will support this metadata type.

This way can be used with all image type witch support IPTC : JPEG, PNG, TIFF, and all RAW Tiff files based (NEF, CRW, CR2, MRW, ARW, etc.)

Another way is to use the digikam database to store action list to perform in editor for a picture.

Of course, in all case, these solution are specific to digiKam, and cannot be used easily to an other image manipulation sofware. 

I think that using a versionning of picture is a non sence for me, especially about performance reasons...

Gilles Caulier