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My last post was how to make each HDR panel.
This post will explain how I stitch it all together.
This mosaic is made up of twelve panels. Below is the spatial arrangement.
Top row 1 2 7 11 12
Centre row 4 8 13
Bottom row 9 10 14
The residual gradients due to light pollution are in the direction of the rows and get worse from left to right.
Bitter experience has taught me to stitch panels together in the direction of the gradients.
So we will start with the top row.
Put panels 1, 2 and 7 into a directory.
Using panel 2 as reference register panels 1 and 7 and save registered panels.
PS can then be used to crop panel 2 and the two registered panels 1 and 7 to get rid of reflections in overlap regions.
These crops are then put into a new directory and again using panel 2 as reference register and then calibrate both 1 and 7 to panel two.
Average combine panel 2 with the registered and calibrated panels 1 and 7.
We now have 1+2+7 and the overlaps are now invisible or matched for colour and brightness.
This combination can now be trimmed to get rid of black areas. We can call this topC1.
Put topC1 and panel 11 into a new directory.
Using topC1 as reference then register and calibrate panel 11 and combine topC1 with the registered and calibrated panel 11.
We can call this topC2.
Again trim to get rid of black areas and put this trimmed topC2 into a new directory with panel 12.
repeat as for topc1 and 11.
We now have the top row all nicely matched and registered.
Below is panels 1, 2, 7, 11 and 12 with the final top row all registered and calibrated.
Notice the nasty gradient from left to right.
Bert
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