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- Path: sparky!uunet!channel1![rafael.ramirez@channel1.com]
- From: "rafael ramirez" <rafael.ramirez@channel1.com>
- Newsgroups: comp.compression
- Subject: new better than jpeg?
- Message-ID: <1992Sep1.954.2871@channel1>
- Date: 1 Sep 92 02:23:43 EST
- Reply-To: "rafael ramirez" <rafael.ramirez@channel1.com>
- Distribution: comp
- Organization: Channel 1 Communications
- Lines: 132
-
- Due to the overwhelming (sp?:) interest in the subject, I'm posting what
- little information I have at this moment.
-
- A company called LEAD Technologies, Inc. (8701 Mallard Creek Road
- Charlotte, NC 28262 1-800-637-4699 in NC 704-549-5532 Fax 704-548-8161)
- is suppossly shipping a number of products, mostly programmers
- libraries for PCs, capable of manipulating (rescale, rotate), converting
- (TIFF->JFIF, TGA->JPEG-in-TIFF) and compressing (RLE, LZW, JPEG, and a
- propietary format) many types of images (8bit-Mapped, 16bits, 24bits,
- grey scales). The twist is that their propietary compression system is
- advertised as better than JPEG (smaller sizes and better quality).
-
- The products offered are: (I believe they are all PC-based)
-
- LEADVIEW - Software only compression, decompression, file format
- conversion, and communication. Operate from menuing system,
- DOS command line. Retail = $129.00
-
- LEADVIEW for Windows - Software only compression,decompression, file
- format conversion, as well as the ability to flip, rotate, and
- reverse images. Also includes a palette editor. Retail =
- $179.00
-
- LEADVIEW32 (DOS & WINDOWS)
- - The Fastest, Software only, solution on the market, for
- compression, decompression, file format conversion, and image
- processing (flip, rotate, resize, lighten, darken, etc).
- Operate from menuing system, DOS command line or TSR from
- other applications Retail = $495.00
-
- LEADVIEW 255
- - PC/AT add-on board that accelerates the compression and
- decompression process of both LEADVIEW and LEADVIEW for
- Windows. Conducts compression and decompression in real-time
- Retail = $1,495.00 special summer price $995.00
-
- LEADTOOLS - Real mode DOS Software compression - $995.00 No royalties.
- - Hardware compression via LEADVIEW 255 - FREE with the purchase
- of 2 LEADVIEW 255 boards.
- - Conversion - $249.00 - All conversion and other image
- processing functions are included. (Compression functions not
- included).
-
- LEADTOOLS 386
- - Is software only compression for 386 or higher computers.
- This version of LEADTOOLS will RUN at least 8 to 10 times as
- fast as the current version REAL mode version, and requires a
- 386 compiler like (Intel 386/486 Code Builder Kit) or
- (Watcom C). Retall = $ 995.00
-
- LEADTOOLS DLL for Windows
- - Software compression - $995.00 No royalties.
- - 32bit fast Software compression - 995.00
- - Hardware compression via LEADVIEW 255 - FREE
- with purchase of 2 LEADVIEW 255 boards.
- - Conversion - $249.00 - All conversion and
- other image processing functions are included.
- (Compression functions not included).
- Both work with any product that uses DLL's.
-
- LEADTOOLS Custom Control for Visual Basic.
- - Software compression - $399.00 No royalties.
-
- All the above are "marketing comments" compleately UNVERIFIED by me (or
- anybody I know).
-
- They distribute a shareware file called JPEG4, which contains several
- utilities for PCs already compiled (.exe) and the source code needed to
- build them (.c). The libraries are, of course, NOT there. But you can
- see how the code would work. The programs, although thought as
- "examples" of what the libraries can do, are fully functional file
- format utilities capable of doing TGA (8 bit grey scale, 8 bit color
- mapped, 16, 24, and 32 bit color), PCX (8 bit grey scale and 8 bit color
- mapped), GIF (8 bit grey scale and 8 bit color mapped), TIFF (8 bit grey
- scale, 8 bit color mapped, and 24 bit color), BMP Presentation Manager
- and Windows 4, 8 bit color mapped, and 24 bit color, JFIF JPEG File
- Interchange Format, JTIF (JPEG-in-TIF) & CMP, LEAD Technologies
- proprietary compression file format. There is also a viewer that deals
- with VGA/SVGA/HiColor (15bits/pixel) and Targa (8/16/24/32 bits/pixel)
- boards. All the executables include the .C file with the source.
-
- Well, a first look at the stuff leaves me unimpressed. While it is VERY
- convinient to have functions like:
-
- L_CompressALL Compress all supported file formats
- L_CompressBMP Compress a BMP image file format to LEAD, JFIF, or JTIF
- L_CompressGIF Compress a GIF image file format to LEAD, JFIF, or JTIF
- L_CompressPCX Compress a PCX image file format to LEAD, JFIF, or JTIF
- L_CompressTarg Compress the current image in the TARGA or TARGA+ video
- L_CompressTGA Compress a TGA image file format to LEAD, JFIF, or JTIF
- L_CompressTIF Compress a TIFF image file format to LEAD, JFIF, or JTI
- L_FileConvert Convert any supported image file to another supported
-
- etc, the fact that the source code is not available makes the product
- very little atractive. Also, the company must be small, their shareware
- concept and typos in the documentation makes them look somewhat
- un-professional, so I would do more research before commiting a project
- to their libs.
-
- Now the "goodie" ... their propietary compression system. They don't
- mention how it works, but several pointers show that it is a very close
- derivative of JPEG (i.e. they use the C-cube based board for split
- second compression of both, JPEG and their "LEAD"). Only two people with
- some references on it (neither first hand!) have replied and their
- opinion seems to match my preliminary one.
-
- The system looks like a "fine-tuned" JPEG derivative that produces
- slightly smaller files were some post-processing, I believe, leaves
- indeed an image w/o many of the artifacts of JPEG for the same level of
- compression (less color contamination, better contrast). When higher
- compression ratios are used, JPEG-like artifacts start to show (blocking
- being the worst offender). The system performs like JPEG for gray-scale
- and better in color (smaller files, less visible defects).
-
- The software seems to be written in the usual "slow" C code. I.e. a
- 320x200x24 TGA file took about 10 seconds on a 486/33 (15Mips;) to both,
- compress (~40K) and decompress to their default setting ("perfect
- quality"). The resulting picture was undistinguishable (sp?) from the
- original to my non-expert eye. I would venture it looked better than
- the JPEGed one. A little slow for my taste. I was using the "normal"
- shareware version. They claim to have 386 compiled code that should run
- much faster, etc.
-
- Well, more information when I get it. This stuff is VERY preliminary
- and should be taken lighty ...
-
- Conclusion: it might be worth it to look some more into it ...
-
- * SLMR 2.1a * Rafael.Ramirez@channel1.com from SPAIN! (A.K.A. RRC)
- --
- Channel 1 (R) Cambridge, MA
-
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