Bitmaps are rotated and mirrored?

[MarleneBusch]

Describe the bug
The raytracer currently produces bitmaps/tensors that need to be flipped (rotated 180 degrees) and transposed before they can be compared to the calibration images/bitmaps downloaded from PAINT.

To reproduce
Steps to reproduce the behavior:

1. Go to ARTIST/artist/util/alignment_optimizer.py
2. In the method optimize_kinematic_parameters_with_raytracing() look at the optimization loop and notice how the bitmap is flipped and transposed before the new center is calculated.
3. Use matplotlib.pyplot to visualize what is happening.
4. Compare to the calibration image downloaded from PAINT

Expected behavior
The raytracer should deliver bitmaps that are oriented correctly.

Additional context
You can see how we always transposed the raytraced bitmaps before using them in other tests as well, for example test_integration_stral_data.py.

[MarleneBusch]

We should talk about this soon. @Filos1992 @mcw92 @kalebphipps

[MarleneBusch]

@Filos1992 said that they need to be transposed because plt.imshow() defines their coordinate system different than we do. This is therefore only important when we create plots.

This still does not explain why they are upside down.