Rotate and mirror are available in the pre-processing property group. If you are in advanced layout, click the image in teh Object Browser to display the image properties.

Non-destructive crop is possible by selecting a render rectangle (6th button in the toolbar) and right clicking it in the viewport, then select "Crop canvas to render rect" in the context menu.

Thanks for your precious hints.As I try to rotate an image PWS3 does this indeed - in the preview.But on the canvas / main area it is croped.When I change the size of the "canvas" the image is randomly placed somewhere.I can´t find a logic behind this behaviour.canvas doesn´t rotate Kind regardsJuergen

The Image Rotatation feature was designed with multi-image compositing in mind. You surely do not want to change the canvas when rotating only one image of five. We could make an exception and rotate the canvas when there is only one image loaded. It looks like a reasonable enhancement request.

For the moment (if you work with a single image) after rotate you should right click the image in the object browser and in the pop-up menu select "Set canvas size to image size"

I was mislead by a wrong / unprecise formulation in the tutorial 7.2: ### You can right-click the Object to change the following size properties: ###So I tried to right-click the IMAGE ITSELF - which shows only the moving hand. By chance I found out that I have to right-click on the OBJECT (Gallery).