1 <?xml version="1.0" encoding="utf-8" ?> 2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 6 <title>Magick++ API: PixelPacket</title> 7 <link rel="stylesheet" href="magick.css" type="text/css" /> 8 </head> 9 <body> 10 <div class="doc-section"> 11 <h1 align="center">PixelPacket Structure</h1> 12 <p style="margin-bottom: 0cm">The <i>PixelPacket</i> structure is used to represent pixels in ImageMagick. ImageMagick 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 ImageMagick 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.</p> 13 <br /> 14 <p align="center" style="margin-bottom: 0cm"><b>Effect Of QuantumDepth Values</b></p> 15 <center> 16 <table width="336" border="1" cellpadding="2" cellspacing="3" bgcolor="#CCCCCC"> 17 <col width="101" /> 18 <col width="99" /> 19 <col width="110" /> 20 <tr> 21 <td width="101"> 22 <p align="center"><b>QuantumDepth</b></p></td> 23 <td width="99"> 24 <p align="center"><b>Quantum Type</b></p></td> 25 <td width="110"> 26 <p align="center"><b>PixelPacket Size</b></p></td></tr> 27 <tr> 28 <td width="101"> 29 <p align="center">8</p></td> 30 <td width="99"> 31 <p align="center">unsigned char</p></td> 32 <td width="110"> 33 <p align="center">32 bits</p></td></tr> 34 <tr> 35 <td width="101"> 36 <p align="center">16</p></td> 37 <td width="99"> 38 <p align="center">unsigned short</p></td> 39 <td width="110"> 40 <p align="center">64 bits</p></td></tr></table></center> 41 <p style="margin-bottom: 0cm">The members of the <i>PixelPacket</i> structure, and their interpretation, are shown in the following table:</p> 42 <br /> 43 <p align="center" style="margin-bottom: 0cm"><b>PixelPacket Structure Members</b></p> 44 <center> 45 <table width="523" border="1" cellpadding="2" cellspacing="3" bgcolor="#CCCCCC"> 46 <col width="58" /> 47 <col width="50" /> 48 <col width="102" /> 49 <col width="152" /> 50 <col width="119" /> 51 <tr> 52 <td rowspan="2" width="58"> 53 <p align="center"><b>Member</b></p></td> 54 <td rowspan="2" width="50"> 55 <p align="center"><b>Type</b></p></td> 56 <td colspan="3" width="388"> 57 <p align="center"><b>Interpretation</b></p></td></tr> 58 <tr> 59 <td width="102"> 60 <p align="center"><a href="Enumerations.html#ColorspaceType">RGBColorspace</a></p></td> 61 <td width="152"> 62 <p align="center"><a href="Enumerations.html#ColorspaceType">RGBColorspace</a> + <a href="Image++.html#matte">matte</a></p></td> 63 <td width="119"> 64 <p align="center"><a href="Enumerations.html#ColorspaceType">CMYKColorspace</a></p></td></tr> 65 <tr> 66 <td width="58"> 67 <p><font size="2">red</font></p></td> 68 <td width="50"> 69 <p><font size="2">Quantum</font></p></td> 70 <td width="102"> 71 <p><font size="2">Red</font></p></td> 72 <td width="152"> 73 <p><font size="2">Red</font></p></td> 74 <td width="119"> 75 <p><font size="2">Cyan</font></p></td></tr> 76 <tr> 77 <td width="58"> 78 <p><font size="2">green</font></p></td> 79 <td width="50"> 80 <p><font size="2">Quantum</font></p></td> 81 <td width="102"> 82 <p><font size="2">Green</font></p></td> 83 <td width="152"> 84 <p><font size="2">Green</font></p></td> 85 <td width="119"> 86 <p><font size="2">Magenta</font></p></td></tr> 87 <tr> 88 <td width="58"> 89 <p><font size="2">blue</font></p></td> 90 <td width="50"> 91 <p><font size="2">Quantum</font></p></td> 92 <td width="102"> 93 <p><font size="2">Blue</font></p></td> 94 <td width="152"> 95 <p><font size="2">Blue</font></p></td> 96 <td width="119"> 97 <p><font size="2">Yellow</font></p></td></tr> 98 <tr> 99 <td width="58"> 100 <p><font size="2">opacity</font></p></td> 101 <td width="50"> 102 <p><font size="2">Quantum</font></p></td> 103 <td width="102"> 104 <p><font size="2">Ignored</font></p></td> 105 <td width="152"> 106 <p><font size="2">Opacity</font></p></td> 107 <td width="119"> 108 <p><font size="2">Ignored</font></p></td></tr></table></center> 109 </div> 110 </body> 111 </html> 112
