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Difference between lossless and lossy compression?
File compression uses software algorithms to reduce file size by reducing the bit-rate of a file. Lossy compression takes it a bit further and lowers the quality of thr file to make it even smaller. Lossy compression is commonly used for media files, but would not be appropriate for other types of files.
What is it called when compression data some of the data is lost yet can represent the original close enough?
When compressed data that is subsequently decompressed does not exactly match the original, yet it is considered close enough to the original to be usable, that algorithm is called a lossy compression. Contrast that with lossless compression, where the decompressed version exactly matches the original. Lossy compression is useful in audio and video, where exactness is not critical, while lossless compression is useful in data streams that must be preserved exactly. The lossy compression algorithm often results in more compact compressed results.
What are facts about compression?
Compression is the process of reducing the size of data to save storage space and transmission bandwidth. There are two main types of compression: lossless compression, where no data is lost during the process, and lossy compression, which sacrifices some data quality for further reduction in file size. Popular compression algorithms include ZIP, JPEG, MP3, and MPEG.
What is A lossy image format?
Lossy format means that data was lost during conversion from original source, for example WAV to MP3 results in loss of audio data that most people can't hear, because they're probably have a terrible monitor chain. MP3 is a lossy format. WAV is lossless. And use Google next time please.
Why some bulk message sending software encountering spamming and sending failed problems?
Basically, mobile communication use compression techniques. Two types of compression techniques are there. they are: 1. lossy compression 2. lossless compression. While the user send an SMS, copmression technique is applied at the transmitter section and decompression technique is applied at the receiver. These compression techniques were takes place automatically. 1. In lossy compression, some data may lost at the receiver while performing decompression. 2. In lossless compression, the transmitted data is received without any loss at the receiver. Due to lossy compression only, u may have some problems at the receiver side such as "some text missing". etc.
What is good and about saving your image as JPG?
This is the right format for those photo images which must be very small files; for example, for web sites or for email. The JPG file is wonderfully small, often compressed to perhaps only 1/10 of the size of the original data. However, this fantastic compression efficiency comes with a high price. JPG uses lossy compression (lossy meaning "with losses to quality") .Lossy means that some image quality is lost when the JPG data is compressed and saved, and this quality can never be recovered.
What is compressed data file?
A compressed data file is a file where the data has been re-encoded in such a way as to reduce the overall length of the file (in bytes). Data compression is useful as it allows us to fit more data into a given space, which is useful for backup purposes (hence compression programs are also known as archive programs). Compression also allows us to transmit data across a network more efficiently. In addition, we can re-encode multiple files into a single compressed file known as a volume. Large volumes can also be split into a series of smaller volumes. This is useful when a single volume is too large to fit onto a DVD, for instance. Compression programs can also be integrated into the operating system shell program such that we can treat compressed volumes as easily as we can folders, allowing compression and decompression "on-the-fly". There are two ways to compress data: with loss and without loss. Lossless compression means we can faithfully restore the original data from the re-encoded data. All data archiving programs use lossless compression. Lossy compression means the lost data can never be recovered unless we have a backup of the original source data. Audio and video data can both make use of lossy compression (up to a point) because the human eye and ear are quite forgiving; we can remove massive amounts of redundant data before we begin to notice any difference. For instance, MP3 audio compression can reduce a 50 MB CD-quality audio file to around 5 MB without any appreciable loss in fidelity. The audiophile and "golden ear" community will always claim MP3 is inferior to CD (which it technically is), but extensive blind-testing under laboratory conditions has shown that they can't tell the difference. Lossy compression can also benefit from lossless compression to a degree. Once the redundant data has been removed, a lossless compression algorithm can be applied to the remaining data. In the case of MP3, Huffman prefix encoding can be applied to each encoded audio frame. Run Length Encoding, Huffman prefix encoding and arithmetic encoding are common examples of lossless encoding techniques. The more efficient lossless algorithms, such as LZW, are patented and require a licence to use in your own programs, however there are open source algorithms available, including the popular 7-Zip, although some restrictions still apply.
What is the following type of compressed data file?
A compressed data file is a file where the data has been re-encoded in such a way as to reduce the overall length of the file (in bytes). Data compression is useful as it allows us to fit more data into a given space, which is useful for backup purposes (hence compression programs are also known as archive programs). Compression also allows us to transmit data across a network more efficiently. In addition, we can re-encode multiple files into a single compressed file known as a volume. Large volumes can also be split into a series of smaller volumes. This is useful when a single volume is too large to fit onto a DVD, for instance. Compression programs can also be integrated into the operating system shell program such that we can treat compressed volumes as easily as we can folders, allowing compression and decompression "on-the-fly". There are two ways to compress data: with loss and without loss. Lossless compression means we can faithfully restore the original data from the re-encoded data. All data archiving programs use lossless compression. Lossy compression means the lost data can never be recovered unless we have a backup of the original source data. Audio and video data can both make use of lossy compression (up to a point) because the human eye and ear are quite forgiving; we can remove massive amounts of redundant data before we begin to notice any difference. For instance, MP3 audio compression can reduce a 50 MB CD-quality audio file to around 5 MB without any appreciable loss in fidelity. The audiophile and "golden ear" community will always claim MP3 is inferior to CD (which it technically is), but extensive blind-testing under laboratory conditions has shown that they can't tell the difference. Lossy compression can also benefit from lossless compression to a degree. Once the redundant data has been removed, a lossless compression algorithm can be applied to the remaining data. In the case of MP3, Huffman prefix encoding can be applied to each encoded audio frame. Run Length Encoding, Huffman prefix encoding and arithmetic encoding are common examples of lossless encoding techniques. The more efficient lossless algorithms, such as LZW, are patented and require a licence to use in your own programs, however there are open source algorithms available, including the popular 7-Zip, although some restrictions still apply.
What are the advantages and disadvantages of lossless and lossy compression?
Lossless compression results in a closer representation of the original media, and thus a higher quality end product. The disadvantage is that the resulting file will be larger than if you had used a lossy compression format. Lossy compression can give you a smaller file size, but the resulting end product may be in some ways inferior to the original.
What happens to a file when it is compressed?
There are many different techniques for compression. In high level summary, repeated sequences of bytes or bits within the file are replaced with a key that represents that sequence, so that when the file is stored, it uses less space. When it is called back up, it is decompressed, and those keys are replaced with the original sequences, and the file is rendered in its original form.Depending on the algorithm used, the compression can be lossless or lossy. Lossless means that nothing is lost in compression and decompression. Lossy means that some bits can be lost, perhaps pixels in a bitmap or high frequency blips in a waveform, that are chosen to probably not represent useful information. By doing this, you can achieve higher compression factors, at the cost of the loss of some (hopefully) insignificant data.A good example of a lossy compression algorithm is the codec used in your telephone - you don't have to have "perfect" one-for-one translation of the bits in your digitized voice, so they program an ultra high compression, lossy factor into the codec on your telephone, and cell phone.
What compression formats are used for image?
Compression methods are used for images compression and most common compressions are JPEG which is lossy (you can lost some details or quality of image), LZW which is lossless, RLE and ZIP also lossless compressions.
Do JPEG images lose minor image details?
Generally yes, the JPEG algorithm uses a lossy compression, so minor image details are lost. For more details about the JPEG algorithm visit the related link.
