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8 The Independent JPEG Group's JPEG software11 This distribution contains a release of the Independent JPEG Group's free JPEG18 and other members of the Independent JPEG Group.21 (also known as JPEG, together with ITU-T SG16).29 OVERVIEW General description of JPEG and the IJG software.31 REFERENCES Where to learn more about JPEG.42 wizard.txt Advanced usage instructions for JPEG wizards only.45 libjpeg.txt How to use the JPEG library in your own programs.46 example.c Sample code for calling the JPEG library.47 structure.txt Overview of the JPEG library's internal structure.[all …]
4 USAGE instructions for the Independent JPEG Group's JPEG software7 This file describes usage of the JPEG conversion programs cjpeg and djpeg,9 the other documentation files if you wish to use the JPEG library within18 These programs implement JPEG image encoding, decoding, and transcoding.19 JPEG (pronounced "jay-peg") is a standardized compression method for25 We provide two programs, cjpeg to compress an image file into JPEG format,26 and djpeg to decompress a JPEG file back into a conventional image format.59 JPEG files are in the defacto standard JFIF file format. There are other,60 less widely used JPEG-based file formats, but we don't support them.77 -grayscale Create monochrome JPEG file from color input.[all …]
1 Advanced usage instructions for the Independent JPEG Group's JPEG software6 The "wizard" switches are intended for experimentation with JPEG by persons7 who are reasonably knowledgeable about the JPEG standard. If you don't know11 when making files intended for general use, because not all JPEG decoders12 will support unusual JPEG parameter settings.19 as examples in the JPEG standard) and scales them up or down according to24 JPEG and is not supported by all implementations. If you need to ensure39 will be stored in the JPEG file).46 # Quantization tables given in JPEG spec, section K.182 component, in the order in which the components appear in the JPEG SOF marker.[all …]
1 USING THE IJG JPEG LIBRARY3 This file was part of the Independent JPEG Group's software:11 This file describes how to use the IJG JPEG library within an application15 JPEG library. Also see jpeglib.h (the include file to be used by application46 Progressive JPEG support69 The IJG JPEG library provides C code to read and write JPEG-compressed image76 JPEG standard but is necessary for typical applications of JPEG. These77 functions preprocess the image before JPEG compression or postprocess it after84 A wide range of quality vs. speed tradeoffs are possible in JPEG processing,90 low-quality modes may not meet the JPEG standard's accuracy requirements;[all …]
1 IJG JPEG LIBRARY: SYSTEM ARCHITECTURE3 This file was part of the Independent JPEG Group's software:10 This file provides an overview of the architecture of the IJG JPEG software;15 We assume that the reader is already somewhat familiar with the JPEG standard.16 The README.ijg file includes references for learning about JPEG. The file21 In this document, JPEG-specific terminology follows the JPEG standard:40 * A subroutine library for JPEG compression and decompression.42 JFIF JPEG files to and from several other image formats.47 We desire the library to be capable of supporting all JPEG baseline, extended51 The library does not support the lossless (spatial) JPEG process. Lossless[all …]
29 program was used to decompress an existing JPEG image.32 occurred when attempting to decompress a JPEG image that had been compressed41 JPEG images that were compressed with a sampling factor other than 1 (for102 more easily defend against one of the progressive JPEG exploits (LJT-01-004)161 4. Fancy upsampling is now supported when decompressing JPEG images that use163 rotating or transposing JPEG images that use 4:2:2 (h2v1) chroma subsampling.168 JPEG images into RGB or extended RGB output images. This significantly speeds173 6. The TurboJPEG API will now decompress 4:2:2 and 4:4:0 JPEG images with177 1x2 luminance and 1x1 chrominance sampling factors), but the JPEG specification182 attempting to decompress a specially-crafted malformed JPEG image. This issue[all …]
6 CHANGE LOG for Independent JPEG Group's JPEG software29 Add cjpeg -rgb option to create RGB JPEG files.31 colorspace input to the default YCbCr JPEG colorspace.41 Repair problem in new memory source manager with corrupt JPEG data.136 if decoding a progressive JPEG. The appearance no longer depends on the163 Multiple calls to jpeg_simple_progression for a single JPEG object210 Progressive JPEG support: library can read and write full progressive JPEG217 JPEG formats; primarily, it can be used to convert baseline to progressive218 JPEG and vice versa. In support of jpegtran, the library now allows lossless219 reading and writing of JPEG files as DCT coefficient arrays. This ability[all …]
5 libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX, SSE2,6 NEON) to accelerate baseline JPEG compression and decompression on x86, x86-64,11 libjpeg-turbo rivals that of proprietary high-speed JPEG codecs.23 of making high-speed JPEG compression/decompression technology available to a40 JPEG images:43 and decompressing JPEG images in memory. It also provides some functionality50 decompressing JPEG images. It is more difficult to use than the TurboJPEG63 libjpeg-turbo includes extensions that allow JPEG images to be compressed123 v7+ could take advantage of accelerated baseline JPEG encoding/decoding188 SmartScale is an extension to the JPEG format that allows for DCT block[all …]
4 libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX, SSE2,5 NEON, AltiVec) to accelerate baseline JPEG compression and decompression on10 performance of libjpeg-turbo rivals that of proprietary high-speed JPEG codecs.22 of making high-speed JPEG compression/decompression technology available to a43 JPEG images:47 JPEG images in memory. It also provides some functionality that would not be55 JPEG images. It is more difficult to use than the TurboJPEG API but also67 libjpeg-turbo includes extensions that allow JPEG images to be compressed128 v7+ could take advantage of accelerated baseline JPEG encoding/decoding192 SmartScale is an extension to the JPEG format that allows for DCT block[all …]
4 * This file was part of the Independent JPEG Group's software:12 * customize the JPEG software for a particular system.75 * compiling the JPEG code.90 * The following options affect code selection within the JPEG library,109 * The remaining options do not affect the JPEG library proper,116 /* These defines indicate which image (non-JPEG) file formats are allowed. */
1 /* Version ID for the JPEG library.22 * Only 8 and 12 are legal data precisions for lossy JPEG according to the23 * JPEG standard, and the IJG code does not support anything else!
1 IJG JPEG LIBRARY: CODING RULES3 This file was part of the Independent JPEG Group's software:49 The JPEG library is intended to be used within larger programs. Furthermore,76 modules that are used in cjpeg/djpeg but are not part of the JPEG library
2 :mod:`jpeg` --- Read and write JPEG files7 :synopsis: Read and write image files in compressed JPEG format.15 .. index:: single: Independent JPEG Group18 written by the Independent JPEG Group (IJG). JPEG is a standard for compressing19 pictures; it is defined in ISO 10918. For details on JPEG or the Independent20 JPEG Group software refer to the JPEG standard or the documentation provided28 A portable interface to JPEG image files is available with the Python Imaging89 JPEG Still Image Data Compression Standard90 The canonical reference for the JPEG image format, by Pennebaker and Mitchell.92 …ous-tone Still Images - Requirements and Guidelines <http://www.w3.org/Graphics/JPEG/itu-t81.pdf>`_[all …]
10 Description: A SIMD-accelerated JPEG codec that provides both the libjpeg and TurboJPEG APIs11 libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX, SSE2,12 NEON, AltiVec) to accelerate baseline JPEG compression and decompression on17 performance of libjpeg-turbo rivals that of proprietary high-speed JPEG30 of making high-speed JPEG compression/decompression technology available to a
1 …JPEG image codec that uses SIMD instructions (MMX, SSE2, NEON, AltiVec) to accelerate baseline JPE…5 … spun off into an independent project, with the goal of making high-speed JPEG compression/decompr…
38 Summary: A SIMD-accelerated JPEG codec that provides both the libjpeg and TurboJPEG APIs56 libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX, SSE2,57 NEON, AltiVec) to accelerate baseline JPEG compression and decompression on62 performance of libjpeg-turbo rivals that of proprietary high-speed JPEG codecs.74 of making high-speed JPEG compression/decompression technology available to a
12 0-D. JPEG-encoded image.30 If True, create a JPEG that loads progressively (coarse to fine).70 summary: "JPEG-encode an image."78 * `grayscale`: Output a grayscale JPEG image. The `channels` dimension80 * `rgb`: Output an RGB JPEG image. The `channels` dimension
6 0-D. The JPEG-encoded image.58 summary: "Decode a JPEG-encoded image to a uint8 tensor."65 * 0: Use the number of channels in the JPEG-encoded image.69 If needed, the JPEG-encoded image is transformed to match the requested number
6 0-D. The JPEG-encoded image.64 summary: "Decode and Crop a JPEG-encoded image to a uint8 tensor."71 * 0: Use the number of channels in the JPEG-encoded image.75 If needed, the JPEG-encoded image is transformed to match the requested number
6 0-D. The JPEG-encoded image.22 summary: "Extract the shape information of a JPEG-encoded image."
27 import static com.google.common.net.MediaType.JPEG;177 assertFalse(JPEG.hasWildcard()); in testHasWildcard()188 assertTrue(JPEG.is(ANY_TYPE)); in testIs()192 assertFalse(JPEG.is(ANY_TEXT_TYPE)); in testIs()
15 * Only 8 and 12 are legal data precisions for lossy JPEG according to the16 * JPEG standard, and the IJG code does not support anything else!
252 +/* Support JPEG compression (requires IJG JPEG library) */264 +/* Support Old JPEG compresson (read contrib/ojpeg/README first! Compilation265 + fails with unpatched IJG JPEG library) */292 +/* Pick up YCbCr subsampling info from the JPEG data stream to support files
4 import static com.bumptech.glide.load.resource.bitmap.ImageHeaderParser.ImageType.JPEG;30 JPEG(false), enumConstant91 return JPEG; in getType()