High resolution cameras produce large image files, ranging from hundreds of kilobytes to megabytes, per the camera's resolution and the image-storage format capacity. Image compression uses algorithms to decrease the size of a file. Also, each pixel of an image increases in size when its colour depth increases-an 8-bit pixel (1 byte) stores 256 colors, a 24-bit pixel (3 bytes) stores 16 million colors, the latter known as truecolor. The greater the number of pixel rows and pixel columns, the greater the image resolution, and the larger the file. Q: How is a digital image's file size determined?Ī: Image file size-expressed as the number of bytes-increases with the number of pixels composing an image and the colour depth of the pixels. Other conventions include describing pixels per length unit or pixels per area unit, such as pixels per inch or per square inch.īelow is an illustration of how the same image might appear at different pixel resolutions. One could refer to it as 2048 by 1536 or a 3.1-megapixel image. An 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. 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.
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The first number is the number of pixel columns (width) and the second is the number of pixel rows (height), for example as 640 by 480. When the pixel counts are referred to as resolution, the convention is to describe the pixel resolution with the set of two numbers. The word pixel is based on a contraction of pix ("pictures") and el (for "element").Ī: The term resolution is often used as a pixel count in digital imaging. The intensity of each pixel is variable in color systems, each pixel has typically three or four components such as red, green, and blue, or cyan, magenta, yellow, and black. Each pixel is a sample of an original image, where more samples typically provide more-accurate representations of the original.
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Pixels are arranged in a 2-dimensional grid, represented using squares. A: In digital imaging, a pixel(or picture element) is the smallest item of information in an image.