![]() Lossy means the image is made (even) smaller, but at a detriment to the quality. Lossless means that the image is made smaller, but at no detriment to the quality. You should be aware of a few key factors.įirst, there are two types of compression: Lossless and Lossy. Related question: Ruthlessly compressing large images for the web When to use a certain image compression format really depends on what is being compressed. It can contain both compressed and uncompressed images. TIFF and BMP are both "wrapper" formats, as the data inside can depend upon the compression technique that is used. Examples of lossless image compression is PNG and GIF. As there is no loss of information in lossless compression, it is not able to achieve as high a compression as lossy compression, in most cases. As the name implies, lossless compression will encode all the information from the original, so when the image is decompressed, it will be an exact representation of the original. Lossless compression formats are suited for illustrations, drawings, text and other material that would not look good when compressed with lossy compression. A prime example of a lossy compression format is JPEG. However, it is able to compress images very effectively compared to lossless formats, as it discards certain information. Lossy compression, as its name implies, does not encode all the information of the file, so when it is recovered into an image, it will not be an exact representation of the original. It is not suited for illustrations, drawings and text, as compression artifacts from compressing the image will standout. Lossy compression formats are generally suited for photographs. Bitmap formats such as BMP generally are uncompressed, although there also are compressed BMP files as well. Uncompressed formats take up the most amount of data, but they are exact representations of the image. Image formats can be separated into three broad categories: ![]() ![]() TIFF (or TIF, for the file extension Tagged Image File Format).JPEG (or JPG, for the file extension Joint Photographic Experts Group).Wikipedia entries for each of the formats will give you quite a bit of information: They are different file formats (and their file extensions). ![]()
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