<s>
Layers	O
are	O
used	O
in	O
digital	B-Application
image	I-Application
editing	I-Application
to	O
separate	O
different	O
elements	O
of	O
an	O
image	O
.	O
</s>
<s>
Today	O
they	O
are	O
an	O
integral	O
feature	O
of	O
image	B-Application
editor	I-Application
.	O
</s>
<s>
and	O
then	O
available	O
in	O
Adobe	B-Operating_System
Photoshop	I-Operating_System
3.0	O
,	O
in	O
1994	O
,	O
but	O
today	O
a	O
wide	O
range	O
of	O
other	O
programs	O
,	O
such	O
as	O
Photo-Paint	B-Application
,	O
Paint	B-Application
Shop	I-Application
Pro	I-Application
,	O
GIMP	B-Application
,	O
Paint.NET	B-Language
,	O
StylePix	O
,	O
and	O
even	O
batch	B-General_Concept
processing	I-General_Concept
tools	O
also	O
include	O
this	O
feature	O
.	O
</s>
<s>
In	O
vector	O
image	B-Application
editors	I-Application
that	O
support	O
animation	O
,	O
layers	O
are	O
used	O
to	O
further	O
enable	O
manipulation	O
along	O
a	O
common	O
timeline	O
for	O
the	O
animation	O
;	O
in	O
SVG	B-Application
images	O
,	O
the	O
equivalent	O
to	O
layers	O
are	O
"	O
groups	O
"	O
.	O
</s>
<s>
Each	O
layer	O
may	O
bear	O
individual	O
settings	O
,	O
such	O
as	O
opacity	O
,	O
blending	B-Algorithm
modes	I-Algorithm
,	O
dynamic	O
filters	O
,	O
and	O
potentially	O
hundreds	O
of	O
other	O
properties	O
.	O
</s>
<s>
An	O
adjustment	B-Algorithm
layer	I-Algorithm
typically	O
applies	O
a	O
common	O
effect	O
like	O
brightness	O
or	O
saturation	O
to	O
other	O
layers	O
.	O
</s>
<s>
In	O
addition	O
,	O
an	O
adjustment	B-Algorithm
layer	I-Algorithm
can	O
easily	O
be	O
edited	O
,	O
just	O
like	O
a	O
layer	O
mask	O
,	O
so	O
an	O
effect	O
can	O
be	O
applied	O
to	O
just	O
part	O
of	O
the	O
image	O
.	O
</s>
