X-10 canvas-like texture in dark areas

Started Dec 31, 2011 | Discussions thread
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Re: X-10 canvas-like texture even in EXR mode!
In reply to Tom Schum, Jan 26, 2012

Tom, thanks for doing these tests and posting the results.

Since my last post I have meant to do some systematic tests to better understand the problem but I only did a few and then I just started using the camera in M mode to avoid it. Occasionally I take some shots in L size and the texture is always there.

The following are a series of images shot in jpg F, L size, Program mode, at 100, 200, 400, 800 and 1600 iso. The 100% crops have some USM sharpening to highlight the texture issue, which however is perfectly visible, when present, on OOC jpgs.

What I see is that the texture appears at 200 iso, is strong at 400 and 800 iso, and disappears at 1600 iso, giving way to a more conventional luminance noise. The texture noise is best visible in the purple area in the centre of the images.
Comments welcome!

100 iso, full image:

100 iso, 100% crop near the centre:

200 iso:

400 iso:

800 iso:

1600 iso:

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Pentax K-5 Pentax smc DA 15mm F4 ED AL Limited Pentax smc DA 18-135mm F3.5-5.6ED AL [IF] DC WR
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