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1996-04-07
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Important Notes
***************
Installation
------------
In order to get the JFIF datatype installed properly, you should use the
supplied installation script. If you do not have the Commodore Installer
you will have to install the datatype manually. Install it the same way
the Installer would do it.
Old JPEG datatype
-----------------
You must remove the old "JPEG" file from DEVS:DataTypes, otherwise the JFIF
datatype will not work. The installation script will do this for you. If
you had the old datatype installed, you must reboot to remove it from the
internal datatypes list.
Temporary swap space
--------------------
In certain modes, the datatype may require a large amount of memory. If
this space is not available in main memory, it will create a temporary file
in the directory pointed to by the "JPEGTMP:" assignment. It does not make
sense to have this name assigned to RAM: since there will be no space left
in RAM: if you run out of memory...
Prefs editor
------------
The default mode of the JFIF datatype is 256 colors. If you want HAM or
less colors, use the prefs editor to change the settings. You can change
the settings on a per-application base. The datatype will look for the
file ENV:Classes/DataTypes/jfif.prefs, but the editor does not create the
directories. If you use Installer, the required directories will be set
up correctly, and a default settings file will be installed.
About Icons
-----------
For the preferences editor there are three icons available, one regular
four color icon, and two MagicWB style icons. When you have selected the
MUI version of the preferences editor, the installation script quietly
installes one of the MagicWB style icons. You will have to change them
manually, if you do not like this.
JPEG codec class
----------------
The datatype uses the Tower JPEG Codec Class to decode (decompress) the
JPEG data within the JFIF file. Developers may obtain a separate license
to distribute the JPEG codec. For details, please refer to the Copyright
section in the JFIF.guide.