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- JpegTool
- © 1999 by Stephan Rupprecht
- All rights reserved.
-
-
- COPYRIGHT AND DISCLAIMER
- JpegTool is copyrighted 1999 by Stephan Rupprecht. All rights
- reserved. This program is freeware, so no financial donations
- required. Redistribution allowed if the package is left unchanged.
- The author is not responsible for any damage caused by the use
- or misuse of this documentation and/or the program(s) it describes.
-
-
- REQUIREMENTS
- Any Amiga® (compatible) computer with at least OS3 and '020+ cpu.
- jpeg.library v2+ by Paul Huxham (util/libs/jpeglibrary*.lha or
- http://mafeking.scouts.org.au/~paulh).
- picture.datatype v43+ and datatypes.library v45 (optional, see later).
-
- The gui program by Nils Goers requires:
- triton.library, tritonrexx.library, rexxsupport.library
-
-
- DESCRIPTION
- JpegTool allows you to convert any image that is recognized by
- datatypes into a jpeg image and vice versa.
-
- Features (mainly provided by jpeg.library)
- · can create thumbnails from jpegs.
- · allows to create progressive images (jpeglib v5).
- · provides block smoothing for decompression (jpeglib v5).
- · dct method (jpeglib v4) as well as quality and smoothing
- factor can be changed.
- · optionally creates grayscale images.
-
-
- INSTALLATION
- Simply copy JpegTool to where-ever-you-want :)
-
-
- USAGE
- You can start JpegTool only from shell, since it's a DOS command
- (except for the possibility to start it from Workbench through
- the menu item 'Execute Command...'). The following options are
- provided:
-
- FROM/M/A,TO/A,DESTDATATYPE=DATATYPE=DTN/K,Q=QUALITY/N/K,
- S=SMOOTHING/N/K,DCT=DCTMETHOD/K,BS=BLOCKSMOOTHING/S,
- P=PROGRESSIVE/S,SN=SCALENUM/N/K,SD=SCALEDENOM/N/K,
- SC=SCALE/N/K,GS=GRAYSCALE/S,FORCE/S,ALL/S,FX=FLIPX/S,
- FY=FLIPY/S,NL=NOLAYOUT/S,ILBM/S,QUIET/S
-
- FROM/M/A: specifies the image(s) to convert, patterns will be accepted.
-
- TO/A: name of the new image(s). The specified filename is not necessarily
- just a simple identifier representing exactly one disk object. Instead,
- it is a template which may contain variables/placeholders which will
- be replaced by their actual values. Placeholders recognized are:
-
- %n name of the source file without suffix. You can shorten the
- filename by providing the maximum number of characters allowed
- between % and n (eg. %5n).
- %nu Each time an image is converted an internal counter will be
- increased. %nu holds the current value of this counter.
- %w width of the image.
- %h height ...
- %d depth ...
- %sz shortcut for %wx%hx%d.
- %s suffix _without_ leading point. If you convert an image to jpeg, the
- suffix will be 'jpg' otherwise the name of the datatype specified
- via DATATYPE will be taken as suffix (exception: 'picture' will be
- turned into 'ilbm').
-
- example: this will create thumbnails from all jpg files in the current
- directory. jpegtool #?.jpg %20n_thumb.%s sd=8
-
- NOTE: Source and destination MUST NOT be the same file !
-
- DESTDATATYPE=DATATYPE=DTN/K: tells the program to create a datatypes
- object from a jpeg stream. To create an ilbm picture specify
- DTN=picture (no .datatype ending!). This option requires picture
- datatype v43+ and datatypes.library v45! And, of course, the
- specified subclass of picture dt must be v43 compatible and provide
- an encoder.
-
- ILBM/S: if set, an ilbm picture will be created. No particular
- datatypes.library is required, picture.datatype v43+ is a must!
-
- Q=QUALITY/N/K: quality of the jpeg stream to create (1%..100%).
- default: 75
-
- S=SMOOTHING/N/K: smoothing factor of the jpeg stream to create
- (0%..100%). default: 0 (= no smoothing)
-
- DCT=DCTMETHOD/K: allows to specify the dct method used for
- de-/encoding. The following keywords are recognized:
- ISLOW: integer, slow, more accurate (default).
- IFAST: integer, fast, less accurate.
- FLOAT: float, fast on fast machines, most accurate.
-
- BS=BLOCKSMOOTHING/S: do block smoothing when decompressing.
-
- P=PROGRESSIVE/S: create progressive jpeg.
-
- SN=SCALENUM/N/K: scaling numerator when decompressing a jpeg image.
- The jpeg code only supports a value of 1 (default) currently.
-
- SD=SCALEDENOM/N/K: scaling denominator when decompressing a jpeg
- image. Denominators supported are 1 (default), 2, 4 and 8. Eg. if
- you want to have an image that is halve of the size of the original
- one specify SD=2.
-
- SC=SCALE/N/K: this option requests jpegtool to scale the image by
- 1/1..1/8 and overrides SCALENUM/-DENOM. The scale factor may be 0..3
- which specifies the scale as exponent.
-
- GS=GRAYSCALE/S: create grayscale image.
-
- FX=FLIPX/S: mirrors the image horizontally.
-
- FY=FLIPY/S: mirrors the image vertically.
-
- FORCE/S: overwrite existing files.
-
- ALL/S: convert subdirectories, too. A new directory in the destination
- drawer _won't_ be created!
-
- NL=NOLAYOUT/S: setting this option results in a faster dt->jpeg
- conversion of <= 8bit images when p96 picture.dt is installed (no
- layout will be done). NOTE: You shouldn't use this option in conjunction
- with HAM images or the cgx picture.dt since garbage will be produced
- (this is not a fault of JpegTool). The best is to avoid this option
- I'll probably remove it.
-
- QUIET/S: suppresses any message except error messages.
-
-
- PROBLEMS
- The ffp version of jpeg.library will probably cause your computer to
- crash, so better use the standard one or the fpu version (if possible).
- The latest release of jpeg.library no longer includes an ffp version.
-
-
- HISTORY
- 1.0 first public release
- 1.1 fixed a few non-serious bugs. added grayscale option. creates
- an 8bit image from a grayscale jpeg, now (before truecolor).
- fixed p96 picturedt problems.
- 1.2 Wrong aspect ratio was saved when creating a datatypes object.
- Improved FROM and TO option, now multiple files / whole directories
- can be converted at once. Included JpegToolGUI by Nils Goers.
- 1.3 added FORCE/S option. uses raw mode for input now (when asking you
- for permission to overwrite an existing file) to avoid that the
- input appears in cons' history. when overwriting an existing file
- the filesize didn't change in case that the file was larger before.
- added filesize to the output. Nils updated his gui program.
- 1.4 new ALL/S option. to convert a directory you don't need to give a
- pattern anymore (ie. myimages/#? -> myimages). no longer assumes
- that anything behind the first point of the source name is a suffix
- (see %n placeholder).
- 1.5 added FLIPX/S,FLIPY/S,SCALE/N/K options. supports ham and ehb sources.
- fixed a few small bugs.
- 1.6 - non public release -
- new option NL=NOLAYOUT/S to speed up dt->jpeg conversion of <= 8bit
- images when p96 picture.dt is installed.
- 1.7 converting a jpeg image to ilbm is now supported even without datatypes
- library v45 (see description of ILBM/S switch). picture.datatype v43+
- is still required for this purpose.
- 1.8 depending on the datatypes.library used, using ILBM/S could cause
- enforcer hits <Nils Goers>. Now complains when DTN option is used
- and datatypes.library v45 isn't installed. Updated JpegToolGUI.
-
-
- FUTURE
- bugfixes ;)
- your suggestions
-
-
- SPECIAL THANKS GO TO (in order of appearance:)
- Paul Huxham for jpeg.library.
- Olaf Barthel for his help.
- Nils Goers <nils@goers.line.org> for the gui program.
-
-
- AUTHOR
- Please send bug reports and ideas to
-
- Stephan Rupprecht
- Apfeldweg 1
- D44359 Dortmund
- Germany
-
- Send emails to
-
- stephan.rupprecht@gmx.de
-