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I could probably get near 25 gigapixels if I did the whole sky but I think I will stop once I have the band with the Milky Way Magellanic Clouds Andromeda and Triangulum.
I am stitching with Autopano Giga
Stitching has become a supercomputing problem with such a large dataset. Takes about 4 hours to render a new version with my current workstation that has Dual 6 Core CPUs at 2.8ghz and 32GB RAM.
I am building a better Workstation with 32CPU Cores and 64GB RAM.
Also a PCI Express SSD doing 1GB per second of HDD speed and 7990 GPU which does 8 teraflops and 2 teraflops double presision for scientific calculations.
I will probably have to move to GPU stitching with something like PTGUI or use Professional Linux Astronomy software like SWARP.
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