04-22-2022, 11:25 AM
Hi, forum newbie here (although I've been using GIMP for a few years on and off) 
I have a specific task that I'm struggling with...
I'm working on producing an overlay of two old maps. One of them is rendered accurately to correspond with modern mapping (this is the one I want to use as a reference), the other a photo of an older map which is distorted.
I need to have the 'modern' map on top and have made it transparent so the older map can easily be seen through it when the modern map is overlaid on top of it. The modern map is more or less monochrome with a white background so is the obvious choice for the top layer (the older map is multicoloured and dirty so would be a poor choice for the top layer).
I now need to adjust the perspective of the older map, which is in the lower layer, to remove the distortion and line it up precisely with the modern map. This is possible, but when I try to do it I can't see the modern map on top, which I need to get the registration between the layers correct - it disappears when I select the perspective adjustment option (Shift-P).
Does anyone have any suggestions?
Many thanks, David.
I have a specific task that I'm struggling with...
I'm working on producing an overlay of two old maps. One of them is rendered accurately to correspond with modern mapping (this is the one I want to use as a reference), the other a photo of an older map which is distorted.
I need to have the 'modern' map on top and have made it transparent so the older map can easily be seen through it when the modern map is overlaid on top of it. The modern map is more or less monochrome with a white background so is the obvious choice for the top layer (the older map is multicoloured and dirty so would be a poor choice for the top layer).
I now need to adjust the perspective of the older map, which is in the lower layer, to remove the distortion and line it up precisely with the modern map. This is possible, but when I try to do it I can't see the modern map on top, which I need to get the registration between the layers correct - it disappears when I select the perspective adjustment option (Shift-P).
Does anyone have any suggestions?
Many thanks, David.