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<blockquote data-quote="Felisek" data-source="post: 410779" data-attributes="member: 23887">You don't know whether the contrast fringe is present in the RAW file, as you cannot see it. RAW is not an image. What you see is an image processed either by the camera or by other software. Even if you open a RAW file in a viewer, there is an on-the-fly conversion done.&nbsp;I think that converting RAW data into an image might introduce such artefacts in high-contrast areas. The image sensor does not have pixels with RGB values, it rather consists of monochromatic pixels behind a colour mask (Bayer filter), so one pixel gets green channel, anther gets red and yet another gets blue. Hence, the RAW data does not contain RGB pixels. In the process of &quot;developing&quot; the RAW sensor data, i.e. converting it into an image, the information between the interlaced three colour channels is interpolated. In very high contrast areas this might lead to artefacts you see. You can imagine a situation where the red pixel is in the bright area, while the blue pixel is in the dark area; this would certainly lead to some loss of quality during interpolation.&nbsp;Of course, these artefacts can be exacerbated in post processing by increasing contrast or sharpness.</blockquote>

[QUOTE="Felisek, post: 410779, member: 23887"] You don't know whether the contrast fringe is present in the RAW file, as you cannot see it. RAW is not an image. What you see is an image processed either by the camera or by other software. Even if you open a RAW file in a viewer, there is an on-the-fly conversion done. I think that converting RAW data into an image might introduce such artefacts in high-contrast areas. The image sensor does not have pixels with RGB values, it rather consists of monochromatic pixels behind a colour mask (Bayer filter), so one pixel gets green channel, anther gets red and yet another gets blue. Hence, the RAW data does not contain RGB pixels. In the process of "developing" the RAW sensor data, i.e. converting it into an image, the information between the interlaced three colour channels is interpolated. In very high contrast areas this might lead to artefacts you see. You can imagine a situation where the red pixel is in the bright area, while the blue pixel is in the dark area; this would certainly lead to some loss of quality during interpolation. Of course, these artefacts can be exacerbated in post processing by increasing contrast or sharpness. [/QUOTE]

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