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<TITLE>PixelPacket Structure</TITLE>
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<META NAME="AUTHOR" CONTENT="Bob Friesenhahn">
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<META NAME="DESCRIPTION" CONTENT="Description of PixelPacket structure members.">
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<H1 ALIGN=CENTER>PixelPacket Structure</H1>
<P STYLE="margin-bottom: 0cm">The <I>PixelPacket</I> structure is
used to represent pixels in GraphicsMagick. GraphicsMagick may be compiled
to support 32 or 64 bit pixels. The size of PixelPacket is controlled
by the value of the <I>QuantumDepth</I> define. The default is 64 bit
pixels, which provide the best accuracy. If memory consumption must
be minimized, or processing time must be minimized, then GraphicsMagick
may be compiled with QuantumDepth=8. The following table shows the
relationship between <I>QuantumDepth</I>, the type of <I>Quantum</I>,
and the overall <I>PixelPacket</I> size. <BR><BR>
</P>
<P ALIGN=CENTER STYLE="margin-bottom: 0cm"><B>Effect Of QuantumDepth
Values</B></P>
<CENTER>
<TABLE WIDTH=336 BORDER=1 CELLPADDING=2 CELLSPACING=3 BGCOLOR="#cccccc">
<COL WIDTH=101>
<COL WIDTH=99>
<COL WIDTH=110>
<TR>
<TD WIDTH=101>
<P ALIGN=CENTER><B>QuantumDepth</B></P>
</TD>
<TD WIDTH=99>
<P ALIGN=CENTER><B>Quantum Type</B></P>
</TD>
<TD WIDTH=110>
<P ALIGN=CENTER><B>PixelPacket Size</B></P>
</TD>
</TR>
<TR>
<TD WIDTH=101>
<P ALIGN=CENTER>8</P>
</TD>
<TD WIDTH=99>
<P ALIGN=CENTER>unsigned char</P>
</TD>
<TD WIDTH=110>
<P ALIGN=CENTER>32 bits</P>
</TD>
</TR>
<TR>
<TD WIDTH=101>
<P ALIGN=CENTER>16</P>
</TD>
<TD WIDTH=99>
<P ALIGN=CENTER>unsigned short</P>
</TD>
<TD WIDTH=110>
<P ALIGN=CENTER>64 bits</P>
</TD>
</TR>
</TABLE>
</CENTER>
<P STYLE="margin-bottom: 0cm">The members of the <I>PixelPacket</I>
structure, and their interpretation, are shown in the following
table: <BR><BR>
</P>
<P ALIGN=CENTER STYLE="margin-bottom: 0cm"><B>PixelPacket Structure
Members</B></P>
<CENTER>
<TABLE WIDTH=523 BORDER=1 CELLPADDING=2 CELLSPACING=3 BGCOLOR="#cccccc">
<COL WIDTH=58>
<COL WIDTH=50>
<COL WIDTH=102>
<COL WIDTH=152>
<COL WIDTH=119>
<TR>
<TD ROWSPAN=2 WIDTH=58>
<P ALIGN=CENTER><B>Member</B></P>
</TD>
<TD ROWSPAN=2 WIDTH=50>
<P ALIGN=CENTER><B>Type</B></P>
</TD>
<TD COLSPAN=3 WIDTH=388>
<P ALIGN=CENTER><B>Interpretation</B></P>
</TD>
</TR>
<TR>
<TD WIDTH=102>
<P ALIGN=CENTER><A HREF="Enumerations.html#ColorspaceType">RGBColorspace</A></P>
</TD>
<TD WIDTH=152>
<P ALIGN=CENTER><A HREF="Enumerations.html#ColorspaceType">RGBColorspace</A>
+ <A HREF="Image.html#matte">matte</A></P>
</TD>
<TD WIDTH=119>
<P ALIGN=CENTER><A HREF="Enumerations.html#ColorspaceType">CMYKColorspace</A></P>
</TD>
</TR>
<TR>
<TD WIDTH=58>
<P><FONT SIZE=2>red</FONT></P>
</TD>
<TD WIDTH=50>
<P><FONT SIZE=2>Quantum</FONT></P>
</TD>
<TD WIDTH=102>
<P><FONT SIZE=2>Red</FONT></P>
</TD>
<TD WIDTH=152>
<P><FONT SIZE=2>Red</FONT></P>
</TD>
<TD WIDTH=119>
<P><FONT SIZE=2>Cyan</FONT></P>
</TD>
</TR>
<TR>
<TD WIDTH=58>
<P><FONT SIZE=2>green</FONT></P>
</TD>
<TD WIDTH=50>
<P><FONT SIZE=2>Quantum</FONT></P>
</TD>
<TD WIDTH=102>
<P><FONT SIZE=2>Green</FONT></P>
</TD>
<TD WIDTH=152>
<P><FONT SIZE=2>Green</FONT></P>
</TD>
<TD WIDTH=119>
<P><FONT SIZE=2>Magenta</FONT></P>
</TD>
</TR>
<TR>
<TD WIDTH=58>
<P><FONT SIZE=2>blue</FONT></P>
</TD>
<TD WIDTH=50>
<P><FONT SIZE=2>Quantum</FONT></P>
</TD>
<TD WIDTH=102>
<P><FONT SIZE=2>Blue</FONT></P>
</TD>
<TD WIDTH=152>
<P><FONT SIZE=2>Blue</FONT></P>
</TD>
<TD WIDTH=119>
<P><FONT SIZE=2>Yellow</FONT></P>
</TD>
</TR>
<TR>
<TD WIDTH=58>
<P><FONT SIZE=2>opacity</FONT></P>
</TD>
<TD WIDTH=50>
<P><FONT SIZE=2>Quantum</FONT></P>
</TD>
<TD WIDTH=102>
<P><FONT SIZE=2>Ignored</FONT></P>
</TD>
<TD WIDTH=152>
<P><FONT SIZE=2>Opacity</FONT></P>
</TD>
<TD WIDTH=119>
<P><FONT SIZE=2>Black</FONT></P>
</TD>
</TR>
</TABLE>
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<P><BR><BR><BR>
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