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Making Foveon-like Images with a Bayer Camera

Started Feb 23, 2022 | Discussions thread
k_db Junior Member • Posts: 33
Re: Trick with SPP

TN Args wrote:

Tom Schum wrote:

I tried this on a lark. First I exported a JPG from SPP at actual size. Then I exported it again, at Double Size (4x original pixels). This is an image from the fp L, with TTartisan 50mm F1.4 L-mount manual lens set to about F8.

I took the actual size JPG image and downsized it to 1/4 original pixels by the nearest neighbor method, and I took the Double Size image and downsized it to 1/16th original pixels.

Now I had two images with the same number of pixels each, derived from the raw DNG by two different exports.

I compared them. The Double Size one that was downsized looked better than the actual sized image that was downsized. You can see it in the foliage, the brush grasses, and the water tower antenna. Also it is visible in the white pants worn by one of the golfers.

I guess the artifacts introduced by double sizing in SPP are giving the impression, when downsized, of more detail at pixel level. Got any ideas about what is really going on here?

11.7mb download for UHD image (3840x2160).

This is the whole frame as shot. 5.6mb download for 2380 x 1582 image.

Try it again but exporting to TIFF. Avoid possible issues with lossy JPEG artefacts.

Also, why didn’t you leave the standard size JPEG alone and reduce the Double Size JPEG by 1/4x pixels, for your comparison?

and try bilinear 😃

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