![]() (Sometimes a lossless compression algorithm called LZW is used, but it is not universally supported.) Most graphics programs that use TIFF do not compression. In practice, TIFF is used almost exclusively as a lossless image storage format that uses no compression at all. The details of the image storage algorithm are included as part of the file. TIFF is, in principle, a very flexible format that can be lossless or lossy. ![]() Since the eye has trouble distinguishing between similar colors, 24 bit or 16 million colors is often called TrueColor. New cards devote 24 bits to each pixel, and are therefore capable of displaying 2 24, or 16 million colors without restriction. Later cards would display 256 simultaneously, any of which could be chosen from a pool of 2 24, or 16 million colors. Many early PC video cards would support only 16 fixed colors. The simplest images may contain only two colors, such as black and white, and will need only 1 bit to represent each pixel. ![]() Images start with differing numbers of colors in them. In contrast, a lossy algorithm might store color information at a lower resolution than the image itself, since the eye is not so sensitive to changes in color of a small distance. In contrast, lossy algorithms accept some degradation in the image in order to achieve smaller file size.Ī lossless algorithm might, for example, look for a recurring pattern in the file, and replace each occurrence with a short abbreviation, thereby cutting the file size. It looks for more efficient ways to represent an image, while making no compromises in accuracy. A lossless compression algorithm discards no information. You will often hear the terms "lossy" and "lossless" compression. If an image has few colors, a file type can be designed to exploit this as a way of reducing file size. Compression schemes can be lossy or lossless.Īnother reason for the many file types is that images differ in the number of colors they contain. Compression is a term used to describe ways of cutting the size of the file. Image files can be quite large, and larger file types mean more disk usage and slower downloads. Part of the reason for the plethora of file types is the need for compression. The choices are simpler than you might think. What are they, and how do you choose? These and many other file types are used to encode digital images.
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