FreeLists / arachne / [arachne] Re: DJPEG32.EXE Help File (???)

["Bastiaan Edelman, PA3FFZ" <bastiaan.pa3ffz@xxxxxxxxx>]

Arachne at FreeLists---The Arachne Fan Club!

For your information: converting .jpg not to bmp but to .gif makes it
possible to scroll the whole picture.

Regards, Bastiaan


On Sat, 24 Jan 2004 13:36:12 -0700, Bob Dohse wrote:

> Arachne at FreeLists---The Arachne Fan Club!

> Michal,
> This is an outstanding example of an excellent response to a question.

> I disagree only with the thought that an Arachne help file for DJPEG
> wouldn't be a good option. I think that this material would be great in a
> hyperlinked HTM or AH file. (I realize that some of this IS in the
> Arachne documentation, but not in a comprehensive - and perhaps not
> completely logical - manner).

> But that is just my personal preference.

> Thanks, Michal.

> Bob

> --------- Forwarded message ----------
> From: "Michal H. Tyc" <mht@xxxxxxxxxxxxxxxx>
> To: "Arachne4DOS" <arachne4dos@xxxxxxxxxxxx>
> Date: Sat, 24 Jan 2004 07:58:46 -0800 (PST)
> Subject: [a4dos-list] Re:Re:Re:Re: arachne.cfg variables... (was IMAGES
> UPDATE was Re: Seasons Greetings)

> Hi Greg, Hi all,

> Greg Mayman wrote:

>> And the one that was mentioned was not explained. The case in point is
>> this:
>> "JPEGargs"         -bmp|-bmp -fast (used by MIME.CFG macro $j)

>> Checking on mime.cfg...
>> ;  $j ... DJPEG arguments - ARACHNE.CFG variable DJPEGargs + color
> depth, etc.

>> and it all tells me... what? Should I include the "-fast" or not?
>> If I do or don't, what difference will it make?

> This option corresponds to Options|Preferences & Performance|Fast JPEGs
> (OPT_MISC.AH) and is briefly explained there ("slightly lower quality").

> From MIME.CFG, you know that $j delivers command line options to
> DJPEG32.EXE (or to DJPEG.EXE with 16BIT.APM installed):

> image/jpeg JPG>BMP|$edjpeg32.exe $j $1 $2
> file/.jpg     >BMP|$edjpeg32.exe $j $1 $2
> file/.jpe     >BMP|$edjpeg32.exe $j $1 $2

> so type "djpeg32 -?" (or just "djpeg") to get help:

> usage: c:/arachne/djpeg32.exe [switches] inputfile outputfile
> Switches (names may be abbreviated):
> -colors N      Reduce image to no more than N colors
> -fast          Fast, low-quality processing
> -grayscale     Force grayscale output
> -bmp           Select BMP output format (Windows style) (default)
> -gif           Select GIF output format
> -os2           Select BMP output format (OS/2 style)
> Switches for advanced users:
> -dct int       Use integer DCT method (default)
> -dct fast      Use fast integer DCT (less accurate)
> -dct float     Use floating-point DCT method
> -dither fs     Use F-S dithering (default)
> -dither none   Don't use dithering in quantization
> -dither ordered  Use ordered dither (medium speed, quality)
> -map FILE      Map to colors used in named image file
> -nosmooth      Don't use high-quality upsampling
> -onepass       Use 1-pass quantization (fast, low quality)
> -maxmemory N   Maximum memory to use (in kbytes)
> -outfile name  Specify name for output file
> -verbose  or  -debug   Emit debug output

> Unless you are an expert on computer graphics, you probably don't
> know much more than before. But should Arachne documentation explain
> the details of image processing algorithms used in a plug-in
> application? I don't think so. To help to locate this information,
> a note like "type DJPEG32 -? for option details" under $j explanation
> in MIME.CFG should be sufficient.

>> It is no explanation at all to anyone who is not familiar with
>> the nitty-gritty of the code itself.

> Only if you mean the code of DJPEG ;-)
> -- as shown above.

> Greetings,

> Michal

> -------- END OF FORWARDED MESSAGE ----------

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Bastiaan Edelman, PA3FFZ
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