qccalpha.3

spiht for linux this is used to decod and encode vedio i wich all enjoy

.TH QCCALPHA 3 "QCCPACK" ""
.SH NAME
QccAlphaOpaque, QccAlphaTransparent, QccAlphaTranslucent \-
transparency values
.SH SYNOPSIS
.B #include "libQccPack.h"
.sp
.BI QccAlphaOpaque( alpha )
.br
.BI QccAlphaTransparent( alpha )
.br
.BI QccAlphaTranslucent( alpha )
.br
.SH DESCRIPTION
.BR QccAlphaOpaque() ,
.BR QccAlphaTransparent() ,
and
.BR QccAlphaTranslucent()
are macros for evaluting the transparency of the
.I alpha
argument.
Values less than or equal to
.BR QCCALPHA_TRANSPARENT
are considered transparent, and
.BR QccAlphaTransparent()
will evaluate to 1 for such
.I alpha
values, and 0 otherwise.
Values greater than or equal to
.BR QCCALPHA_OPAQUE
are considered to be opaque, and
.BR QccAphaOpaque()
will evaluate to 1 for such
.I alpha
values, and 0 otherwise.
Values greater than
.BR QCCALPHA_TRANSPARENT
and less than
.BR QCCALPHA_OPAQUE
are considered to be partially transparent, or translucent, and
.BR QccAlphaTranslucent()
will evaluate to 1 for such
.I alpha
values, and 0 otherwise.
.LP
Often
.I alpha
is considered to represent a pixel from a grayscale image; in that
case,
.BR QCCALPHA_TRANSPARENT
would be full black,
.BR QCCALPHA_OPAQUE
would be full white,
and values between the two would be some shade of gray.
.SH "SEE ALSO"
.BR QccPack (3)
.SH AUTHOR
Copyright (C) 1997-2009  James E. Fowler
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