<s>
The	O
Appearance	B-Operating_System
Manager	I-Operating_System
is	O
a	O
component	O
of	O
Mac	B-Operating_System
OS	I-Operating_System
8	I-Operating_System
and	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
that	O
controls	O
the	O
overall	O
look	O
of	O
the	O
Macintosh	B-Device
graphical	B-Application
user	I-Application
interface	I-Application
widgets	O
and	O
supports	O
several	O
themes	O
.	O
</s>
<s>
It	O
was	O
originally	O
developed	O
for	O
Apple	O
's	O
ill-fated	O
Copland	B-Application
project	O
,	O
but	O
with	O
the	O
cancellation	O
of	O
this	O
project	O
the	O
system	O
was	O
moved	O
into	O
newer	O
versions	O
of	O
the	O
Mac	O
OS	O
.	O
</s>
<s>
The	O
Appearance	B-Operating_System
Manager	I-Operating_System
is	O
also	O
available	O
free	O
as	O
part	O
of	O
a	O
downloadable	O
SDK	B-Application
for	O
System	B-Operating_System
7	I-Operating_System
.	O
</s>
<s>
The	O
Appearance	B-Operating_System
Manager	I-Operating_System
is	O
implemented	O
as	O
an	O
abstraction	O
layer	O
between	O
the	O
Control	O
Manager	O
and	O
QuickDraw	B-Operating_System
.	O
</s>
<s>
Previously	O
,	O
controls	O
made	O
direct	O
QuickDraw	B-Operating_System
calls	O
to	O
draw	O
user	O
interface	O
elements	O
such	O
as	O
buttons	O
,	O
scrollbars	O
,	O
window	O
title	O
bars	O
,	O
etc	O
.	O
</s>
<s>
With	O
the	O
Appearance	B-Operating_System
Manager	I-Operating_System
,	O
these	O
elements	O
are	O
abstracted	O
into	O
a	O
series	O
of	O
APIs	O
that	O
draw	O
the	O
item	O
as	O
a	O
distinct	O
entity	O
on	O
behalf	O
of	O
the	O
client	O
code	O
,	O
thus	O
relieving	O
the	O
Control	O
Manager	O
of	O
the	O
task	O
.	O
</s>
<s>
An	O
updated	O
and	O
more	O
powerful	O
version	O
of	O
the	O
Appearance	B-Operating_System
Manager	I-Operating_System
was	O
used	O
for	O
Carbon	B-Operating_System
applications	O
in	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
even	O
after	O
Apple	O
made	O
the	O
transition	O
to	O
Aqua	B-Application
.	O
</s>
<s>
The	O
Extras.rsrc	O
file	O
is	O
an	O
updated	O
version	O
of	O
an	O
Appearance	O
Theme	O
that	O
is	O
compatible	O
with	O
the	O
newer	O
Appearance	B-Operating_System
Manager	I-Operating_System
.	O
</s>
<s>
As	O
of	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
version	O
10.3	O
,	O
'	O
layo	O
 '	O
data	O
is	O
no	O
longer	O
used	O
,	O
even	O
for	O
Carbon	B-Operating_System
applications	O
,	O
so	O
the	O
continued	O
existence	O
of	O
the	O
Appearance	B-Operating_System
Manager	I-Operating_System
can	O
no	O
longer	O
be	O
confirmed	O
.	O
</s>
<s>
The	O
default	O
look	O
and	O
feel	O
of	O
the	O
Appearance	B-Operating_System
Manager	I-Operating_System
in	O
Mac	B-Operating_System
OS	I-Operating_System
8	I-Operating_System
and	O
9	O
is	O
Platinum	B-Operating_System
design	O
language	O
,	O
which	O
was	O
intended	O
to	O
be	O
the	O
primary	O
GUI	B-Application
for	O
Copland	B-Application
.	O
</s>
<s>
Platinum	B-Operating_System
retains	O
many	O
of	O
the	O
shapes	O
and	O
positions	O
of	O
elements	O
from	O
System	B-Operating_System
7	I-Operating_System
and	O
earlier	O
,	O
like	O
window	O
control	O
widgets	O
and	O
buttons	O
and	O
while	O
Charcoal	O
is	O
the	O
default	O
system	O
font	O
,	O
Chicago	O
was	O
available	O
via	O
a	O
menu	O
option	O
.	O
</s>
<s>
Apple	B-Operating_System
Platinum	I-Operating_System
is	O
not	O
a	O
theme	O
,	O
however	O
.	O
</s>
<s>
It	O
is	O
actually	O
embedded	O
into	O
the	O
Appearance	B-Operating_System
Manager	I-Operating_System
.	O
</s>
<s>
The	O
Appearance	O
Control	O
Panel	O
has	O
the	O
ability	O
to	O
attach	O
a	O
theme	O
to	O
the	O
Appearance	B-Operating_System
Manager	I-Operating_System
.	O
</s>
<s>
There	O
is	O
an	O
Apple	B-Operating_System
Platinum	I-Operating_System
file	O
in	O
the	O
themes	O
folder	O
in	O
the	O
System	B-Operating_System
Folder	I-Operating_System
which	O
acts	O
as	O
a	O
stub	O
,	O
but	O
no	O
functional	O
theme	O
elements	O
are	O
embedded	O
into	O
it	O
.	O
</s>
<s>
Customizable	O
palettes	O
( 	O
 '	O
clut	O
 '	O
resources	O
)	O
are	O
used	O
for	O
progress	O
bars	O
,	O
scroll	O
thumbs	O
,	O
slider	O
tabs	O
and	O
menu	O
selections	O
in	O
Apple	B-Operating_System
Platinum	I-Operating_System
and	O
this	O
unique	O
option	O
is	O
not	O
available	O
to	O
real	O
themes	O
.	O
</s>
<s>
The	O
Appearance	O
Control	O
Panel	O
uses	O
the	O
type	O
code	O
'	O
pltn	O
 '	O
to	O
identify	O
if	O
a	O
file	O
should	O
act	O
like	O
a	O
palette	O
modification	O
stub	O
to	O
Apple	B-Operating_System
Platinum	I-Operating_System
and	O
the	O
type	O
code	O
'	O
thme	O
 '	O
to	O
identify	O
if	O
a	O
file	O
should	O
act	O
like	O
an	O
Appearance	O
Theme	O
.	O
</s>
<s>
An	O
important	O
distinction	O
is	O
that	O
the	O
Appearance	O
Control	O
Panel	O
implements	O
themes	O
into	O
the	O
Appearance	B-Operating_System
Manager	I-Operating_System
.	O
</s>
<s>
Kaleidoscope	O
is	O
third-party	O
software	O
that	O
implements	O
schemes	O
into	O
the	O
Appearance	B-Operating_System
Manager	I-Operating_System
.	O
</s>
<s>
Kaleidoscope	O
is	O
not	O
a	O
substitute	O
for	O
the	O
Appearance	B-Operating_System
Manager	I-Operating_System
;	O
it	O
is	O
a	O
substitute	O
for	O
the	O
Appearance	O
Control	O
Panel	O
.	O
</s>
<s>
Apple	O
widely	O
demonstrated	O
two	O
Appearance	O
Themes	O
which	O
override	O
Apple	B-Operating_System
Platinum	I-Operating_System
,	O
Hi-Tech	O
and	O
Gizmo	O
.	O
</s>
<s>
Both	O
changed	O
every	O
single	O
element	O
of	O
the	O
overall	O
GUI	B-Application
,	O
leaving	O
no	O
trace	O
of	O
Apple	B-Operating_System
Platinum	I-Operating_System
.	O
</s>
<s>
This	O
theme	O
uses	O
elements	O
that	O
make	O
the	O
interface	O
look	O
like	O
it	O
has	O
been	O
drawn	O
in	O
pencil	O
on	O
a	O
drafting	B-Architecture
board	O
,	O
including	O
small	O
"	O
pencil	O
marks	O
"	O
around	O
the	O
windows	O
,	O
a	O
barely	O
visible	O
graph	O
paper	O
grid	O
on	O
the	O
desktop	O
,	O
and	O
"	O
squarish	O
"	O
elements	O
with	O
low	O
contrast	O
.	O
</s>
<s>
One	O
retrospective	O
review	O
by	O
a	O
long-time	O
Mac	O
user	O
described	O
the	O
themes	O
as	O
being	O
a	O
mistake	O
and	O
waste	O
of	O
engineering	O
resources	O
,	O
saying	O
the	O
"	O
Hi-Tech	O
"	O
theme	O
"	O
looked	O
like	O
a	O
typical	O
dark	O
over-decorated	O
techno	O
skin	O
that	O
became	O
popular	O
for	O
Linux	B-Application
desktops	O
"	O
and	O
that	O
"	O
Gizmo	O
"	O
looked	O
"	O
awful	O
...	O
the	O
Finder	O
in	O
a	O
clown	O
suit	O
"	O
.	O
</s>
<s>
In	O
order	O
to	O
be	O
a	O
system	O
font	O
,	O
glyphs	O
specific	O
to	O
the	O
Mac	O
operating	O
system	O
need	O
to	O
be	O
provided	O
,	O
such	O
as	O
the	O
Command	B-Device
key	I-Device
symbol	O
( ⌘	O
)	O
.	O
</s>
<s>
Later	O
versions	O
of	O
the	O
Appearance	B-Operating_System
Manager	I-Operating_System
also	O
apply	O
anti-aliasing	B-Algorithm
to	O
type	O
displayed	O
on	O
the	O
screen	O
above	O
a	O
certain	O
size	O
,	O
by	O
default	O
.	O
</s>
<s>
Anti-aliasing	B-Algorithm
is	O
adjustable	O
in	O
the	O
Appearance	O
Control	O
Panel	O
.	O
</s>
<s>
Shareware	O
products	O
exist	O
that	O
provided	O
some	O
features	O
of	O
the	O
Appearance	B-Operating_System
Manager	I-Operating_System
before	O
they	O
were	O
offered	O
directly	O
in	O
the	O
Appearance	O
Control	O
Panel	O
.	O
</s>
<s>
Kaleidoscope	O
,	O
written	O
by	O
Arlo	O
Rose	O
and	O
Greg	O
Landweber	O
,	O
applied	O
"	O
schemes	O
"	O
to	O
the	O
GUI	B-Application
before	O
Apple	O
released	O
an	O
update	O
to	O
the	O
Appearance	O
Control	O
Panel	O
with	O
Mac	O
OS	O
8.5	O
which	O
provides	O
similar	O
functionality	O
using	O
"	O
themes	O
"	O
.	O
</s>
<s>
Because	O
of	O
this	O
,	O
Apple	O
released	O
little	O
documentation	O
for	O
the	O
theme	O
format	O
,	O
withheld	O
their	O
own	O
beta-released	O
themes	O
,	O
and	O
even	O
issued	O
a	O
cease	O
and	O
desist	O
notice	O
to	O
the	O
authors	O
of	O
a	O
third-party	O
theme	O
editor	O
on	O
grounds	O
that	O
it	O
was	O
intended	O
to	O
allow	O
users	O
to	O
create	O
themes	O
that	O
imitate	O
the	O
Aqua	B-Application
interface	I-Application
in	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
.	O
</s>
<s>
Kaleidoscope	O
was	O
only	O
rendered	O
obsolete	O
with	O
the	O
transition	O
to	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
with	O
which	O
Kaleidoscope	O
is	O
not	O
compatible	O
.	O
</s>
