RS Camera Background Image Rotation

[GregBollella]

Considering the new Background tab of the RS camera I wonder if there is a way to rotate the image. I have a backplate image that is slightly tilted and would like to straighten it.

Thanks,
Greg

[Dr. Sassi]

Hi Greg,

I would do this in Photoshop, which is a one-time action.

Since I write in a forum and assume that questions will come up more often, I will go deeper.

Rotation of an image always will lower the quality, which is why I would do it before, to have complete control over it. The quality in rendering is the highest target, while images are rotated, even a little bit, this will alter quality. This means one needs a larger image, to begin with, to compensate for this. Rotation is not a minor change; it is a somewhat complex process. Close to the rotation point and on the periphery, the mix of pixels is different, as the change in position varies. Besides, one can't just rotate an image without scaling it up if it is not larger. If not scaled, some areas might have no data at all.

I'm unaware that one can do it in Redshift 3D for the Camera Background; it would occupy some memory space, as it needs to be read in, plus the result for the camera. It would also require a process how for handling the resulting problems. This goes pretty much against the concept of optimizing anything in Redshift 3D. It might be processed in every single frame.
As with everything, why don't use a material that is ready to work with? I find it true with anything if it should be optimized. Solving things in the Node tree that can be done before is the way to go.

For example, if the background stays in DOF (Depth and Blur), with a specific Bokeh (the quality of the blur and its "drawing"), then an image that just provides the Field of View has no data to produce this DOF/Bokeh around the borders. But if rotated, it has perhaps more or loss in some areas, and no data to support this effect evenly around the frame. Not ideal either. This means to prep images for specific uses might benefit the results.

If this is something needed despite the downsides, there is always an option to use the "Share Your Ideas" with Maxon here:
https://www.maxon.net/en/support-center

All the best

[GregBollella]

@Dr-Sassi Thanks Dr. Sassi. I had not realized all the issues in rotating an image!
Cheers,
Greg

[Dr. Sassi]

You're very welcome, Greg.

Thank you very much for the feedback. When image quality is the target, which is my assumption, preparation is critical.

My best wishes for your project