In PS Lens correction: is distort/perspective/rotation performed in a single step?

[Guillermo Luijk]

Does anyone (Madmanchan?) know by certain if the geometric corrections in the Photoshop 'Lens correction' tool (Distortion, Perspective and Rotation) are perfomed in a single math operation? so that quality loss is kept to a minimum.



I don't see any reason not to do it that way, but would like to be sure from some informed source.

Regards

PS: BTW I wonder by the vignet correction is applied after all the other operations (Distortion, Perspective and Rotation), this is nonsense since vigneting is an optical flaw and hence has the centre of symmetry in the middle point of the original image.

[madmanchan]

Hi Guillermo, unfortunately I don't know the answer with regards to the PS Lens Correction plug-in. (For Camera Raw and Lightroom, the answer is yes, only a single image resampling step is performed, and the lens vignette compensation is done in the logical manner, i.e., prior to executing the warp transform.)

[Guillermo Luijk]

Thanks for your reply Eric, I guess PS also performs a single step (or hope so).

Cheers