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1995-09-26
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Remarks for version 3.0
-----------------------
A serious bug in memory allocation has been found and corrected. Also,
menu for the -m option has been expanded so that the display mode and the
scaling factor can be changed on the fly.
Remarks for version 2.0
-----------------------
This is an improvement of version 1.0 (see below). New options include:
-g display picture in grayscale (black and white). Useful for quick high
resolution previews
-m decompress the entire picture in memory. Afterwards one can move around
the picture by clicking (or double-clicking) on the scroll bars. This
scrolling is possible only if the picture is bigger than the screen.
In case of "insufficient memory" error, one or more of the following steps
can be taken:
1. scale down the picture using -s2 or even -s4
2. display the picture in grayscale, -g
3. refrain from using -m option.
Two errors in version 1.0 have been found and corrected: pictures which are
originally grayscale are now displayed correctly and the offsets are calculated
correctly when displaying many pictures.
For quick previewing, I recommend either
jpegshow *.jpg -m -g -s2 (or even -s4 if the pictures are very big)
or
jpegshow *.jpg -m -1 -s2
Andrzej Kotanski Cracow, March 22, 1995
Remarks for version 1.0
-----------------------
This is a JPEG viewer for MM/1 and MM/1a based on the IJG JPEG library
version 5a. It has been compiled with GNU gcc ver. 2.5.8, separately for MM/1
(file jpegshow.070, compiled with option -m68000) and for MM/1a (file
jpegshow, compiled with option -mcpu32).
For the list of options and their current settings type "jpegshow -?". They
include:
-1 for single pass, quick but low quality picture
-p for setting the delay length after each picture. -1 means wait for user
typing CR, 0 means no delay
-sn where n = 1, 2, 4 or 8, to scale down the size of the picture by this
factor
-xn, -yn where n = 0 to 99, to start displaying the picture at this offset
(in percent of the total size)
I am thinking of a better user interface to this program, using the mouse
and the scroll bars to move the picture. This will be for the next version ...
The source is included and it is surprisingly simple, most of the function-
ality given by the Independent JPEG Group's library.
Enjoy,
Andrzej Kotanski
(kotanski@desy.de) Cracow, March 12, 1995