There are two types of image file compression algorithms: lossless and lossy. With vector images the file size increases only with the addition of more vectors. images with large continuous regions like line art or animation sequences) may be losslessly compressed into a GIF or PNG format and result in a smaller file size than a lossy JPEG format.įor example, a 640 × 480 pixel image with 24-bit color would occupy almost a megabyte of space:Ħ40 × 480 × 24 = 7,372,800 bits = 921,600 bytes = 900 KiB For example, graphically simple images (i.e. 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). 3.1.14 Container formats of raster graphics editors.

Best image format for web products