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  2. Transcoding - Wikipedia

    en.wikipedia.org/wiki/Transcoding

    For example, when a camera phone is used to take a digital picture, a high-quality image of usually at least 640x480 pixels is created. When sending the image to another phone, this high resolution image might be transcoded to a lower resolution image with fewer colors in order to better fit the target device's screen size and color limitations.

  3. Image conversion - Wikipedia

    en.wikipedia.org/wiki/Image_conversion

    Many image formats are native to one specific graphics application and are not offered as an export option in other software, due to proprietary considerations. An example of this is Adobe Photoshop 's native PSD-format (Prevention of Significant Deterioration), which cannot be opened in less sophisticated programs for image viewing or editing ...

  4. Lossy compression - Wikipedia

    en.wikipedia.org/wiki/Lossy_compression

    Composite image showing JPG and PNG image compression. Left side of the image is from a low-quality JPEG image, showing lossy artefacts; the right side is from a PNG image. In information technology , lossy compression or irreversible compression is the class of data compression methods that uses inexact approximations and partial data ...

  5. Generation loss - Wikipedia

    en.wikipedia.org/wiki/Generation_loss

    Digital generation loss induced by rotating a JPEG image 90 degrees (from top to bottom) 0, 100, 200, 500, 900, and 2000 times (without using lossless tools). Generation loss is the loss of quality between subsequent copies or transcodes of data.

  6. Audio file format - Wikipedia

    en.wikipedia.org/wiki/Audio_file_format

    An Audiobook format, which is a variable-bitrate (allowing high quality) M4B file encrypted with DRM. MPB contains AAC or ALAC encoded audio in an MPEG-4 container. (More details below.) .act: ACT is a lossy ADPCM 8 kbit/s compressed audio format recorded by most Chinese MP3 and MP4 players with a recording function, and voice recorders .aiff ...

  7. Help:Creation and usage of media files - Wikipedia

    en.wikipedia.org/wiki/Help:Creation_and_usage_of...

    Wikipedia uses the Ogg Vorbis, FLAC and WAV format for audio, as they are not encumbered by patents (an issue that prompted the decision in 2004 that MP3 files would not be hosted at Wikipedia [1]). Since then, the MP3 patents have expired and Wikimedia legal has given permission to allow uploading as needed by Wikimedia or its communities. [2]

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