Image quality
Spatial resolution
Several measures can be used to assess the quality of still photographs, the most discussed being the pixel count, presumed to correlate with spatial resolution. This is measured by the quantity of picture elements (pixels) in the image sensor, usually counted in millions and called "megapixels". Measuring the resolution of both film and digital photographs involves numerous issues. For film, this issue depends upon the size of film used ( 35mm,Medium format or Large format), the speed of the film used and the quality of lens fitted to the camera.
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