11/1/2022 0 Comments Types of image compression![]() the number of shades of colors you group together) you may or may not notice a difference in the image's quality. Depending upon the compression value you define (i.e. There are millions of shades of colors, and transform encoding takes colors that have similar shades and makes them one single value. Transform encoding is a lossy compression commonly used for JPEGs. Normally, the data for it would be written as Much smaller and simpler while still keeping the data unaltered. Say you have a picture of red and white stripes, and there are 12 white pixels and 12 red pixels. Run-length encoding is a form of lossless compression that takes redundant strings or runs of data and stores them as one unit. It uses a combination of LZ77 and Huffman coding to achieve compression results that do not affect the quality of the image. Deflateĭeflate is a lossless data compression algorithm used for PNG images. These algorithms, or variations of these algorithms, are also what is used in image compression tools and services. Now that we've discussed various image formats, the following explains a few image compression methods used to achieve either lossless or lossy compression. The example below shows a comparison between GIF images which range from 8 colors to 256 colors. The best use for GIFs are for images that are animated. If the photo has more than 256 colors (the maximum amount of colors older computers could have) this format will make the image look less appealing. GIF compresses files by reducing the number of colors it has. The same degradation applies if you save a JPG multiple times. There are however programs out there that rotate a JPG losslessly. This is because the photo has to recompress itself with every rotation, losing some data in the process. If you rotate the JPG too much, you'll notice a difference in quality. There are also other ways a JPG image's quality may be reduced. A normal amount of compression will not be noticeable, while extreme compression may be obvious. JPGĪlso known as JPEG, this format gets rid of bits and pieces of a photo that you may notice depending upon the level of compression you apply. Here are the two main types of lossy compression. However, this doesn't mean the photo will look bad. In order to give the photo an even smaller size, lossy compression discards some parts of a photo. It should also be noted that converting a lossy photo back to lossless won't restore the photo's data. BMP - A format found exclusively to Microsoft.The compression is reversible, so once you open a PNG file, the image recovers exactly. PNG - Compresses images to keep their small size by looking for patterns on a photo, and compressing them together. Types of image compression software#Additionally, there are different versions of RAW, and you may need certain software to edit the files. However, these files types tend to be quite large in size. RAW - Found in many DSLRs, and keeps all the light data received from the camera's sensor.JPEG, on the other hand, won't fill up your hard drive as fast, but some of the data is lost in the conversion. ![]() Types of image compression professional#RAW files have no compression and are great if you're a professional photo editor. For example, in a DSLR camera, you probably have the option to save photos as either RAW or JPEG. Lossless compression is a method used to reduce the size of a file while maintaining the same quality as before it was compressed. There are two kinds of image compression methods - lossless vs lossy. ![]()
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