Correct abrupt linea exposure changes on old black and white photos

[Poggio]

I am in the process of restoring some old black and white photos.  A few of them have abrupt changes in exposure levels across the printed photo.

Most of the photo is correctly exposed but there is a straight line cut-off top to bottom about 3/4 across the frame where the print appears over exposed.

This may have been to to a shutter fault in the camera or a processing error.

Is there a way to correct this in Affinity Photo?

[Old Bruce]

Welcome to the forums @Poggio,

You could try an Adjustment layer with a gradient across its integrated Mask. C

hoose an exposure adjustment and make the appropriate adjustment for the "over exposed" area. draw a gradient across the little area where the problem starts.