The protocols in this standard debunk the use of pixel count (megapixels) as a representation of camera resolution. The first edition, issued in 2000, provided a scientifically sound and easily accomplished standard way to measure the true optical resolution performance of any digital camera image of the test target shown above.
ISO/TC 42 has revised ISO 12233, now ISO 12233:2014, Photography - Electronic still picture imaging - Resolution and spatial frequency responses, with methods for measuring the resolution and the Spatial Frequency Response (SFR) of digital cameras. Camera resolution test chart from ISO 12233:2000
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