[Digikam-devel] [Bug 140131] No zoom in image preview

[Arnd Baecker]

 > >- pressing F4 to open the image editor: the zoom in the album view
> >   is undone (however, moving the slider afterwards shows, that it is
> >   still zoomed in)
>
> Hum, fixed in svn i think.

Just tried with revision 652228: the problem persists; steps to
reproduce are:
- F3
- zoom in (e.g. 1200%)
- F4  ==> the zoom in the album view is undone.

> >So while it is nice to be able to zoom in, it does not allow for
> >a judgement of the image quality (in contrast to the image editor).
> >Do you think that there is a way to use the actual image
> >(maybe from a certain zoom-level on?) But that would (quite
> >certainly?) slow things down...
>
> no. the implementation is not do in this way. All tool to change the image are in editor. Preview mode is not an editor.

Well, I was not thinking of editing the image, but just
displaying it at its actual resolution from a certain zoom-level on.
I think Frank's suggestion in #16 would be a very good solution.

> Uups: I just realized that for zooming in, the image editor also
> some interpolation is done, so that that one does not see the single
> pixels, but some nicely interpolated version?
>
> You want mean to have an option to disable interpolation with Zoom in (named antialiasing in editor) ?

I think that this would be good to have.
(The quality of the interpolation is very good, but
to just judge the quality on the pixel-level alone
it would be good to have no interpolation - e.g for
gqview this corresponds to the "interpolation=nearest")