[Digikam-devel] [Bug 142056] Save changes of image modifications with Versioning.

[Dotan Cohen]

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http://bugs.kde.org/show_bug.cgi?id=142056         




------- Additional Comments From kde-2 dotancohen com  2008-08-06 14:31 -------
 Gilles: Yes, png is better. Agreed. I mentioned jpg with the [bad] assumption that the original would be jpg, and that the user would prefer the same format as the original.

 Unai: I agree that the original request here does not seem to be versioning. However, my own and other versioning request bugs were duped to this bug, so I take my arguments and interest here.

> What's the difference between the proposed
> jpeg versioning and "save as" option
> currectly available?

The versioning feature lets the new image 'replace' the original in the Thumbnail and View modes. Think of the case where you took an otherwise excellent photo of your wife, but the frame is crooked and she has redeye. With versioning you can straighten the photo and remove the redeye, without ever altering the original image. During normal use the user only sees the altered image. However, in View mode the user can select a previous version of the photo (the original as it came from the camera) and view or alter it as he sees fit. As Mikolaj pointed out, with versioning the older versions do not clutter the album.

 Jisakiel: you are thinking about Edit Undo, not versioning. The current method of editing and undoing will not be changed. The only change with versioning will be that the revised image will be saved in addition to the original, not overwriting the original.

Regarding disk space:
The disk space used with versioning will grow as O(n) with usage. This is ideal, and keeps disk space used on the same order of magnitude as without versioning. If your disk has not enough space for versioning, then it has not enough space for normal growth due to the addition of new photos anyway. If this is not familiar to you, then please read a bit about space complexity: http://en.wikipedia.org/wiki/Computational_complexity_theory#Time_and_space_complexity