Compression Artifacts - Revision history

WikiSysop at 03:38, 17 July 2011

2011-07-17T03:38:15Z

WikiSysop at 08:27, 14 March 2009

2009-03-14T08:27:08Z

WikiSysop at 08:26, 14 March 2009

2009-03-14T08:26:45Z

WikiSysop at 16:06, 2 December 2008

2008-12-02T16:06:35Z

WikiSysop at 16:04, 2 December 2008

2008-12-02T16:04:16Z

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When aggressive data comprssion is applied to image, audio or video, some data may be discarded if its deemed too complex to store at the current data-rate, or if the algorithm decides that the information is of little importance. Compression artifacts occur because of the latent errors in the process or basically the extreme result of overzealous lossy data compression.

Compression artifacts occur in many common media such as DVDs, common computer file formats such as JPEG, MP3, or MPEG files, and Sony's ATRAC compression algorithm. Uncompressed media (such as on Laserdiscs, Audio CDs, and WAV files) or losslessly compressed media (FLAC, PNG, etc.) do not suffer from compression artifacts.

← Older revision		Revision as of 03:38, 17 July 2011
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	* [[Interlacing]]		* [[Interlacing]]
	* [[Purple Fringing]]		* [[Purple Fringing]]
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		+	[[Category:Digital Imaging]]

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 == See Also ==
-[[Interlacing]]
+* [[Interlacing]]
-[[Purple Fringing]]
+* [[Purple Fringing]]

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 When aggressive data comprssion is applied to image, audio or video, some data may be discarded if its deemed too complex to store at the current data-rate, or if the algorithm decides that the information is of little importance. Compression artifacts occur because of the latent errors in the process or basically the extreme result of overzealous lossy data compression.
-Compression artifacts occur in many common media such as DVDs, common computer file formats such as JPEG, MP3, or MPEG files, and Sony's ATRAC compression algorithm. Uncompressed media (such as on Laserdiscs, Audio CDs, and WAV files) or losslessly compressed media (FLAC, PNG, etc.) do not suffer from compression artifacts.
+Compression artifacts in compressed audio typically show up as ringing, pre-echo, drop-outs, warbling, metallic ringing, an underwater feeling, hissing, or "graininess". A good way to observe compression artifacts in audio is to listen to the applause in a relatively highly compressed (eg 96 kbit/sec) MP3. In general, music has repeating structures and more predicable variations in volume, whereas applause is essentially random, therefore hard to compress. This highly compressed track of applause will illustrate the "metallic ringing" and other compression artifacts very well.
-Compression artifacts in compressed audio typically show up as ringing, pre-echo, drop-outs, warbling, metallic ringing, an underwater feeling, hissing, or "graininess". A good way to observe compression artifacts in audio is to listen to the applause in a relatively highly compressed (eg 96 kbit/sec) MP3. In general, music has repeating structures and more predicable variations in volume, whereas applause is essentially random, therefore hard to compress. This highly compressed track of applause will illustrate the "metallic ringing" and other compression artifacts very well.
+[[Interlacing]]

← Older revision		Revision as of 16:06, 2 December 2008
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	When aggressive data comprssion is applied to image, audio or video, some data may be discarded if its deemed too complex to store at the current data-rate, or if the algorithm decides that the information is of little importance. Compression artifacts occur because of the latent errors in the process or basically the extreme result of overzealous lossy data compression.		When aggressive data comprssion is applied to image, audio or video, some data may be discarded if its deemed too complex to store at the current data-rate, or if the algorithm decides that the information is of little importance. Compression artifacts occur because of the latent errors in the process or basically the extreme result of overzealous lossy data compression.
		+
		+


	Compression artifacts occur in many common media such as DVDs, common computer file formats such as JPEG, MP3, or MPEG files, and Sony's ATRAC compression algorithm. Uncompressed media (such as on Laserdiscs, Audio CDs, and WAV files) or losslessly compressed media (FLAC, PNG, etc.) do not suffer from compression artifacts.		Compression artifacts occur in many common media such as DVDs, common computer file formats such as JPEG, MP3, or MPEG files, and Sony's ATRAC compression algorithm. Uncompressed media (such as on Laserdiscs, Audio CDs, and WAV files) or losslessly compressed media (FLAC, PNG, etc.) do not suffer from compression artifacts.
		+
		+	Compression artifacts in compressed audio typically show up as ringing, pre-echo, drop-outs, warbling, metallic ringing, an underwater feeling, hissing, or "graininess". A good way to observe compression artifacts in audio is to listen to the applause in a relatively highly compressed (eg 96 kbit/sec) MP3. In general, music has repeating structures and more predicable variations in volume, whereas applause is essentially random, therefore hard to compress. This highly compressed track of applause will illustrate the "metallic ringing" and other compression artifacts very well.