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From: d83_sven_a@tekno.chalmers.se (SVEN AXELSSON)
Newsgroups: comp.sys.mac
Subject: System 7.0 icons (was: SunDesk hints)
Message-ID: <8214@tekno.chalmers.se>
Date: 23 Feb 90 10:39:47 GMT
Organization: Chalmers Univ. of Technology, Gothenburg, Sweden
Lines: 54

Of course I am not in tpe position to comment on what Apple REALLY
intends to do, but this is what they said in the preliminary developer
notes for Finder 7.0 published in april last year.
 
In previous versions of the Finder, the only kind of icon that could be
included in a bundle was a standard 32-by-32 two-color icon. In
Finder 7.0, it is also possible to include small and color icons in a
file's bundle. These icons should look like the 'ICN#' resource.
Moreover, any additional icons must have the same resource ID as the
'ICN#' resource. The resource types for these additional icons are as
follows:
 
o  A 'SICN' resource contains a small (16-by-16-bit) two-color icon
   together with an icon mask.
 
o  An 'ics4' resource contains the data for a small icon for which there
   are 4 bits of color data. This resource uses the 4-bit system color
   look-up table (CLUT) and the icon mask contained in the 'SICN'
   resource.
 
o  An 'ics8' resource contains the data for a small icon for which there
   are 8 bits of color data. This resource uses the 8-bit system color
   look-up table (CLUT) and the icon mask contained in the 'SICN'
   resource.
 
o  An 'icl4' resource contains the data for a large (32-by 32-bit) icon
   for which there are 4 bits of color data. This resource uses the 
   4-bit system color look-up table (CLUT) and the icon mask contained
   in the 'ICN#' resource.
 
o  An 'icl8' resource contains the data for a large (32-by 32-bit) icon
   for which there are 8 bits of color data. This resource uses the 
   8-bit system color look-up table (CLUT) and the icon mask contained
   in the 'ICN#' resource.
 
All of the color icons use one of the standard system color tables to
define the colors. The two main advantages of usinf a standard color
table are reduced resource requirements and reduced color arbitration.
 
When a color icon is selected, Finder 7.0 displays the icon using a
special CLUT in which each color is darker than the corresponding color
in the standard CLUT. This makes selected color icons look very much
like selected icons in previous versions of the Finder.
 
So there you are... This will be the way it works in System 7.0 and
developers should design their own color icons to put in their
applications.
 
+-------------------------+--------------------------------+------------------+
|   Sven Axelsson         |  d83_sven_a@tekno.chalmers.se  |  DISCLAIMER:     |
|   dep:t of Linguistics  |          (^^ best ^^)          |                  |
|   univ. of Gothenburg   |        dlv_sa@hum.gu.se        |  This is not     |
|   SWEDEN                |      usdsa@seguc21.bitnet      |  a disclaimer.   |
+-------------------------+--------------------------------+-------------------