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libjpeg is a widely used free library with functions for handling the JPEG image data format. It implements a JPEG codec (encoding and decoding) alongside various utilities for handling JPEG data. It is written in C and distributed as free software together with its source code under the terms of a custom permissive (BSD-like) free software license, which basically demands attribution. The original variant is maintained and published by the Independent JPEG Group (IJG). Meanwhile, there are several mostly compatible forks with additional features like for example increased coding efficiency. JPEG JFIF images are widely used on the Web. The amount of compression can be adjusted to achieve the desired trade-off between file size and visual quality.〔(JPEG JFIF )〕 ==Utilities== The following utility programs are shipped together with libjpeg: ; cjpeg and djpeg,: for performing conversions between JPEG and some other popular image file formats, ; rdjpgcom and wrjpgcom,: for inserting and extracting textual comments in JPEG files, and ; jpegtran: a utility for transformation of existing JPEG files. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Libjpeg」の詳細全文を読む スポンサード リンク
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