Question about Olympus Camedia C-740 Ultra Zoom Digital Camera

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Ultrazoom pixellation problems

Hi. I own an Olympus C-740 Ultrazoom digicam which performs beautifully except for one thing: it always pixellates and dots neutral grey areas. If the subject happens to be any color from light brown to grey to dark green, black dots and pixellation rear their ugly heads. Could this have to do with the white balance? Thanks

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No, it isn't to do with white balance. Instead it is due to a combination of noise swamping (or at least modifying significantly) the exposure measured by the pixel, and the interpolation algorithm in the sensor processing chips that "guesses" the colour of a pixel based on the readings from nearby pixels. These algorithms are better at rendering certain kinds of image elements than others. Large areas of darkish colour often fool the algorithms into attempting to produce detail that doesn't exist.

Posted on Sep 13, 2005

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Posted on Jan 02, 2017

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