EXCERPT page containing first few paragraphs. 2021-04-20 09:05:54
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Converted from raw DNG into a 16-bit ProPhotoRGB TIF file using Adobe Camera Raw.
Something peculiar exists in this image: a subtle crosshatch pattern exists throughout the image.
I first noticed it in the even-tone areas in the waterfall area, but the effect exists everywhere in the the frame whether the area is light or dark; detail confuses the issue, and it tends not to be seen in high-key smooth areas. JPEG is not involved at all except for presentation purposes here, and the JPEGs as shown here matches the 16-bit TIF.
Since Pentax specifies a 14-bit sensor/file (Color depth: 8 bits/channel JPG, 14 bits/channel RAW), the file size of 31.9MB makes it plain that some form of compression is being used (24MP at 14 bits uncompressed implies a 42MB file size). If lossy compression is being used, that might be the culprit. If lossless compression, then that implicates hardware.
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