BUG: Distortion correction is not linear, but warps at the ends

[metboef]

What happened?

when forcing distortion (over the lens value) the image horizon is not linear, but is like a wave: left up, then down, then up at the center, then down, then up againg at the right end.

What did you expect to happen?

when correcting any distortion the horizon should be a straight line (when done with the right value), instead is not possible to get a straight horizon

How can we reproduce this?

No response

Operating System

Windows 11

RapidRAW Version

1.5.1. & 1.5.3

Additional information

No response

Acknowledgement

• I have verified that my camera and lenses are supported by the external libraries listed above, or my issue is unrelated to camera/lens support.
• I have searched all existing issues, both open and closed, and did not find a duplicate.