Today not about panoramas. About blending various versions of the same 
photo.

I open 3 versions of the same photo - all of them are the same size, for 
example 3000x2000 px
I reset positions and use inclusive masks to select the best parts of each 
version.
There are no control points, because all photos are the same size an 
position (0,0,0) 

Then Stitcher tab - calculate size and crop. 
The cropper often sets the size to 3000x2001 or 3001x1999 or 2998x2000 when 
the images have exactly the same size, position and lens. 
I can correct it manually, but why this inaccuracy?

Maybe you will ask me why I blend 3 versions of the same photo.
A human portrait - one image (the softest version goes for face), version 2 
is body with more contrasts and detail, version 3 is clothes with high HDR 
effect. There can be one more photo for blurred background. 
For architecture and landscape - the sky should be soft and highly 
denoised, the grass and trees should be intermediate, and the bricks with 
high detail. 


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