Hi Katja.

please see bkl-buero.de/aa-bkl/index.php/referenzen/north-coast-communication-gmbh

All those images I built in 1.000px wide.
But the gallery shows them smaller and in less quality.

I see no settings for this in the plugin.
And I cannot fix the shown images with right mouseclick or firebug to investigate for a SIGPRO-resized folder or so ...

I definitely want the images to be shown in original size and quality.
Please help!!
Thank you !!

As far as I can see in your source code the original dimensions of your images
bkl-buero.de/aa-bkl/images/produktgalerien/referenzen/northcoast/northcoast_000.jpg
are the same in the pop up:
bkl-buero.de/aa-bkl/index.php/referenzen/north-coast-communication-gmbh

no in the popup the image is resized to ca. 680px wide
see screenshot
bkl-buero.de/aa-bkl/images/del_joomlaworks001.jpg

No, it does not! Just re-checked! Try checking it in another pc please.