Hello Manuel33,
The image you provided seems to indicate that Alex's solution is what you are looking for (it's not immediately clear where the image you're manipulating with is in relation to the planes in the diagram), could you provide a "before" and "after" example that demonstrates what you are trying to achieve? Better yet, if you can, please post your code as well to show what you've already done and point out what part you are working on.
If all you need is the appearance of a rotation towards or away from the orthogonal plane (this is a 2D image we are talking about, isn't it?) you can achieve this affect by either deleting columns from the image or averaging column subsets. For example- if you want to have the appearance of rotating 45 degrees, delete or average every other column. If you want to add a "perspective" effect and taper the "far" edge, thats a bit more complex but I imagine it could also be achieved with selective deletion or averaging of pixels.
If you're working with a 3D image, that's a very different question. You should be able to rotate the object on which the image is overlaid using the Rotate Object VI available in the Graphics & Sound>>3D Picture Control>>Transformations palette.
Regards,
Tom L.
