| cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" |
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| 6 | <meta name="AUTHOR" content="Bob Friesenhahn"> |
| 7 | <meta name="CREATED" content="20020805;18015392"> |
| 8 | <meta name="CHANGEDBY" content="Bob Friesenhahn"> |
| 9 | <meta name="CHANGED" content="20020805;18024233"> |
| 10 | <meta name="DESCRIPTION" content="Description of PixelPacket structure members."> |
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| 13 | <body lang="en-US" text="#ffffff" link="#1F00FF" vlink="#9900DD" bgcolor="#fbc713"> |
| 14 | <h1 align="center">PixelPacket Structure</h1> |
| 15 | <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> |
| 16 | <br> |
| 17 | <p align="center" style="margin-bottom: 0cm"><b>Effect Of QuantumDepth Values</b></p> |
| 18 | <center> |
| 19 | <table width="336" border="1" cellpadding="2" cellspacing="3" bgcolor="#CCCCCC"> |
| 20 | <col width="101"> |
| 21 | <col width="99"> |
| 22 | <col width="110"> |
| 23 | <tr> |
| 24 | <td width="101"> |
| 25 | <p align="center"><b>QuantumDepth</b></p></td> |
| 26 | <td width="99"> |
| 27 | <p align="center"><b>Quantum Type</b></p></td> |
| 28 | <td width="110"> |
| 29 | <p align="center"><b>PixelPacket Size</b></p></td></tr> |
| 30 | <tr> |
| 31 | <td width="101"> |
| 32 | <p align="center">8</p></td> |
| 33 | <td width="99"> |
| 34 | <p align="center">unsigned char</p></td> |
| 35 | <td width="110"> |
| 36 | <p align="center">32 bits</p></td></tr> |
| 37 | <tr> |
| 38 | <td width="101"> |
| 39 | <p align="center">16</p></td> |
| 40 | <td width="99"> |
| 41 | <p align="center">unsigned short</p></td> |
| 42 | <td width="110"> |
| 43 | <p align="center">64 bits</p></td></tr></table></center> |
| 44 | <p style="margin-bottom: 0cm">The members of the <i>PixelPacket</i> structure, and their interpretation, are shown in the following table:</p> |
| 45 | <br> |
| 46 | <p align="center" style="margin-bottom: 0cm"><b>PixelPacket Structure Members</b></p> |
| 47 | <center> |
| 48 | <table width="523" border="1" cellpadding="2" cellspacing="3" bgcolor="#CCCCCC"> |
| 49 | <col width="58"> |
| 50 | <col width="50"> |
| 51 | <col width="102"> |
| 52 | <col width="152"> |
| 53 | <col width="119"> |
| 54 | <tr> |
| 55 | <td rowspan="2" width="58"> |
| 56 | <p align="center"><b>Member</b></p></td> |
| 57 | <td rowspan="2" width="50"> |
| 58 | <p align="center"><b>Type</b></p></td> |
| 59 | <td colspan="3" width="388"> |
| 60 | <p align="center"><b>Interpretation</b></p></td></tr> |
| 61 | <tr> |
| 62 | <td width="102"> |
| 63 | <p align="center"><a href="Enumerations.html#ColorspaceType">RGBColorspace</a></p></td> |
| 64 | <td width="152"> |
| 65 | <p align="center"><a href="Enumerations.html#ColorspaceType">RGBColorspace</a> + <a href="Image.html#matte">matte</a></p></td> |
| 66 | <td width="119"> |
| 67 | <p align="center"><a href="Enumerations.html#ColorspaceType">CMYKColorspace</a></p></td></tr> |
| 68 | <tr> |
| 69 | <td width="58"> |
| 70 | <p><font size="2">red</font></p></td> |
| 71 | <td width="50"> |
| 72 | <p><font size="2">Quantum</font></p></td> |
| 73 | <td width="102"> |
| 74 | <p><font size="2">Red</font></p></td> |
| 75 | <td width="152"> |
| 76 | <p><font size="2">Red</font></p></td> |
| 77 | <td width="119"> |
| 78 | <p><font size="2">Cyan</font></p></td></tr> |
| 79 | <tr> |
| 80 | <td width="58"> |
| 81 | <p><font size="2">green</font></p></td> |
| 82 | <td width="50"> |
| 83 | <p><font size="2">Quantum</font></p></td> |
| 84 | <td width="102"> |
| 85 | <p><font size="2">Green</font></p></td> |
| 86 | <td width="152"> |
| 87 | <p><font size="2">Green</font></p></td> |
| 88 | <td width="119"> |
| 89 | <p><font size="2">Magenta</font></p></td></tr> |
| 90 | <tr> |
| 91 | <td width="58"> |
| 92 | <p><font size="2">blue</font></p></td> |
| 93 | <td width="50"> |
| 94 | <p><font size="2">Quantum</font></p></td> |
| 95 | <td width="102"> |
| 96 | <p><font size="2">Blue</font></p></td> |
| 97 | <td width="152"> |
| 98 | <p><font size="2">Blue</font></p></td> |
| 99 | <td width="119"> |
| 100 | <p><font size="2">Yellow</font></p></td></tr> |
| 101 | <tr> |
| 102 | <td width="58"> |
| 103 | <p><font size="2">opacity</font></p></td> |
| 104 | <td width="50"> |
| 105 | <p><font size="2">Quantum</font></p></td> |
| 106 | <td width="102"> |
| 107 | <p><font size="2">Ignored</font></p></td> |
| 108 | <td width="152"> |
| 109 | <p><font size="2">Opacity</font></p></td> |
| 110 | <td width="119"> |
| 111 | <p><font size="2">Black</font></p></td></tr></table></center> |
| 112 | <br> |
| 113 | <br> |
| 114 | </body> |
| 115 | </html> |