Two more 64 MPx example files to play with
My first tries, medium weight tripod, 4 sec delay before each shot:
and a long shot -- a Moire tester
The originals and various full size (30 MB) jpegs are all
here.
Other files: ...i.jpg means that I rendered the 16 MB first frame of the series. And ...OLY.jpg is the in-camera processed 40 MPx jpg that Olympus provides. The picture of the building has Moire on the window sun-grilles when viewed at 100%. It's faint but visible in the jpegs which I developed in Capture One or in the AccuRaw results from Sandy McGuffog, but it is strong and accompanied by a "mosaic" or "stairstep" artifact in the in-camera 40 MPx jpeg.
Think about that for a moment. In the course of taking the 8 exposures, each pixel location has had all four of the Bayer filters in front of it for a single exposure (and the same applies to the second group of four shots, displaced by half a pixel-spacing in the x and y directions. So this has become in principle a Foveon-like image, with all three colors measured at every pixel. So why is there any Moire at all?
Maybe I've got the wrong impression about where the chip moves for its 8 shots. Or maybe this is because, in order to allow fairly standard rendering programs, which expect to see a Bayer array image, Olympus has had to translate their lovely Foveon style image back into a virtual Bayer array with finer spacing, which can then indeed have Moire! Sandy tells me that the big 100 MB .ORF files are coded to represent a 64 MPx array of pixels with standard RGGB Bayer color filters.
scott
Both pictures with 75/1.8@f/8 ISO 200