One could refer to it as 2048 by 1536 or a 3.1-megapixel image. None of these pixel resolutions are true resolutions, but they are widely referred to as such they serve as upper bounds on image resolution.īelow is an illustration of how the same image might appear at different pixel resolutions, if the pixels were poorly rendered as sharp squares (normally, a smooth image reconstruction from pixels would be preferred, but for illustration of pixels, the sharp squares make the point better).Īn image that is 2048 pixels in width and 1536 pixels in height has a total of 2048×1536 = 3,145,728 pixels or 3.1 megapixels. Other conventions include describing pixels per length unit or pixels per area unit, such as pixels per inch or per square inch. Another popular convention is to cite resolution as the total number of pixels in the image, typically given as number of megapixels, which can be calculated by multiplying pixel columns by pixel rows and dividing by one million. But when the pixel counts are referred to as 'resolution', the convention is to describe the pixel resolution with the set of two positive integer numbers, where the first number is the number of pixel columns (width) and the second is the number of pixel rows (height), for example as 7680 × 6876. According to the same standards, the 'Number of Effective Pixels' that an image sensor or digital camera has is the count of pixel sensors that contribute to the final image (including pixels not in said image but nevertheless support the image filtering process), as opposed to the number of total pixels, which includes unused or light-shielded pixels around the edges.Īn image of N pixels height by M pixels wide can have any resolution less than N lines per picture height, or N TV lines. Hence, CIPA DCG-001 calls for notation such as 'Number of Recorded Pixels 1000 × 1500'. The term resolution is often considered equivalent to pixel count in digital imaging, though international standards in the digital camera field specify it should instead be called 'Number of Total Pixels' in relation to image sensors, and as 'Number of Recorded Pixels' for what is fully captured. The resolution of digital cameras can be described in many different ways.

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Web image resolution 96 dpi