Editing scl - FilterMeisterWiki

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= scl =
== Syntax ==
:{{int scl(int a, int il, int ih, int ol, int oh)}}
== Arguments ==
:'''a'''
::An integer value for the 'A' value.
:'''il'''
::An integer value for the lower limit of the input range.
:'''ih'''
::An integer value for the higher limit of the input range.
:'''ol'''
::An integer value for the lower limit of the output range.
:'''oh'''
::An integer value for the higher limit of the output range.
== Return ==
:An integer in the range of ['''ol''','''oh'''].
== Description ==
:Scales value '''a''' from range ['''il''','''ih'''] to range ['''ol''','''oh'''].
== Example ==
<code>
%ffp

ctl(0): "Stretch", range = (0, 255)

R = scl(r, 0, 255, -ctl(0), 255 + ctl(0));
G = scl(g, 0, 255, -ctl(0), 255 + ctl(0));
B = scl(b, 0, 255, -ctl(0), 255 + ctl(0));
</code>
== Also see ==
:((mix))
== Comments ==
:If '''il''' and '''oh''' are 0, the following simple formula performs better: {{result = a * oh / ih;}}

:Everyone can add his comments about his experiences with this function here. Tips for using it are welcome, too.

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