![]() This characteristic sometimes results in a smaller file size for some lossless formats than lossy formats. With some compression formats, images that are less complex may result in smaller compressed file sizes. Considering exactly the same compression, number of pixels, and color depth for two images, different graphical complexity of the original images may also result in very different file sizes after compression due to the nature of compression algorithms. Images with the same number of pixels and color depth can have very different compressed file size. ![]() A compression algorithm stores either an exact representation or an approximation of the original image in a smaller number of bytes that can be expanded back to its uncompressed form with a corresponding decompression algorithm. Images can be compressed in various ways, however. The size of raster image files is positively correlated with the number of pixels in the image and the color depth (bits per pixel).
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