This is the README for jpeg6.N.b.tar.gz [Download] [Browse] [Up]
>Newsgroups: comp.archives.msdos.announce >From: "Tom Lane" <tgl@sss.pgh.pa.us> >Date: Sat, 02 Sep 95 18:46:42 +0400 >Subject: jpegsrc6.zip/jpeg6.zip - JPEG compression/decompression >Message-ID: <306985637@f218.n5020.z2.ftn> I have uploaded to SimTel, the Coast to Coast Software Repository (tm), (available by anonymous ftp from the primary mirror site ftp.coast.net and the secondary mirrors of SimTel): ftp://ftp.coast.net/SimTel/msdos/graphics/jpegsrc6.zip ftp://ftp.coast.net/SimTel/msdos/graphics/jpeg6.zip ftp://ftp.coast.net/SimTel/msdos/graphics/jpeg6386.zip SimTel/msdos/graphics/ jpegsrc6.zip Source code for JPEG compression/decompression jpeg6.zip Convert JPEG files to/from BMP,GIF,PPM,PGM,TGA jpeg6386.zip Faster version of jpeg6.zip for 386 or better These files are source and DOS executables for release 6 of the Independent JPEG Group's free JPEG image compression code. The IJG code includes a reusable JPEG compression/decompression library, plus sample applications "cjpeg" and "djpeg", which perform conversion between JPEG JFIF format and image files in PPM/PGM (PBMPLUS), GIF, BMP, and Targa formats. A third application "jpegtran" provides lossless transcoding between different JPEG formats --- for example, it can convert a baseline JPEG file to an equivalent progressive JPEG file. Two small applications "wrjpgcom" and "rdjpgcom" insert and extract textual comments in JFIF files. The principal improvement in version 6 is support of progressive JPEG. Progressive JPEG allows an image to be stored in multiple scans of increasing quality. The initial scan provides a low-resolution image in very little storage space, typically perhaps 10% of the total file. Additional scans improve the quality, with the final image being exactly equivalent to a baseline JPEG file of the same quality setting. The total space required is about the same as for the equivalent baseline JPEG file (or even a little less). We expect that progressive JPEG will prove extremely popular on the World Wide Web, and in any other situation where an image is to be viewed as it is received over a slow communications link. For images for which JPEG is appropriate (photos and such), progressive JPEG far surpasses interlaced GIF in both total transmission time and the visual appearance of the image refinement sequence. The new IJG library provides full support for performing progressive display of an incoming file. If an application does not require progressive rendering, only recovery of the final image, then no changes to IJG v5-using code are required: just recompile with the new library to be able to read progressive-JPEG files. jpeg6.zip is a "vanilla" version for any DOS machine. jpeg6386.zip is a faster 32-bit version; it will run only on 386 or better CPUs with at least 1Mb extended or expanded memory. Source code is provided in jpegsrc6.zip. jpegsrc6.zip, jpeg6.zip and jpeg6386.zip have replaced jpgsrc5a.zip, jpg5a.zip and jpg5a386.zip respectively. Please direct any questions about this software to jpeg-info@uunet.uu.net. Free. Uploaded by the principal author. Tom Lane organizer, Independent JPEG Group tgl@sss.pgh.pa.us
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.