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| <h3 class="sectionHead"><span class="titlemark">1.5 </span> <a |
| id="x10-270001.5"></a>The <span |
| class="pcrr7t-">VDisplay </span>class</h3> |
| <!--l. 3--><p class="noindent" >The <span class="obeylines-h"><span class="verb"><span |
| class="pcrr7t-">VDisplay</span></span></span> class is an abstraction over the VIPS |
| <span class="obeylines-h"><span class="verb"><span |
| class="pcrr7t-">im_col_display</span></span></span> type which gives convenient and safe |
| representation of VIPS display profiles. |
| <!--l. 6--><p class="indent" > VIPS display profiles are now mostly obsolete. You’re |
| better off using the ICC colour management <span class="obeylines-h"><span class="verb"><span |
| class="pcrr7t-">VImage</span></span></span> |
| member functions <span class="obeylines-h"><span class="verb"><span |
| class="pcrr7t-">ICC_export()</span></span></span> and <span class="obeylines-h"><span class="verb"><span |
| class="pcrr7t-">ICC_import()</span></span></span>. |
| <!--l. 10--><p class="noindent" > |
| <h4 class="subsectionHead"><span class="titlemark">1.5.1 </span> <a |
| id="x10-280001.5.1"></a>Constructors</h4> |
| <!--l. 12--><p class="noindent" >There are two constructors for <span class="obeylines-h"><span class="verb"><span |
| class="pcrr7t-">VDisplay</span></span></span>: |
| <div class="verbatim" id="verbatim-36"> |
| VDisplay( const char ⋆name ); |
|  <br />VDisplay(); |
| </div> |
| <!--l. 17--><p class="nopar" > |
| <!--l. 19--><p class="indent" > The first form initialises the display from one of the |
| standard VIPS display types. For example: |
| |
| |
| |
| <div class="verbatim" id="verbatim-37"> |
| VDisplay fred( "sRGB" ); |
|  <br />VDisplay jim( "ultra2-20/2/98" ); |
| </div> |
| <!--l. 25--><p class="nopar" > |
| <!--l. 27--><p class="indent" > Makes <span class="obeylines-h"><span class="verb"><span |
| class="pcrr7t-">fred</span></span></span> a profile for making images in sRGB |
| format, and <span class="obeylines-h"><span class="verb"><span |
| class="pcrr7t-">jim</span></span></span> a profile representing my workstation |
| display, as of 20/2/98. The second form of constructor |
| makes an uninitialised display. |
| <!--l. 31--><p class="noindent" > |
| <h4 class="subsectionHead"><span class="titlemark">1.5.2 </span> <a |
| id="x10-290001.5.2"></a>Projection functions</h4> |
| <!--l. 33--><p class="noindent" >A set of member functions of <span class="obeylines-h"><span class="verb"><span |
| class="pcrr7t-">VDisplay</span></span></span> provide read and |
| write access to the fields in the display. |
| <div class="verbatim" id="verbatim-38"> |
| char ⋆name(); |
|  <br />VDisplayType &type(); |
|  <br />matrix &mat(); |
|  <br />float &YCW(); |
|  <br />float &xCW(); |
|  <br />float &yCW(); |
|  <br />float &YCR(); |
|  <br />float &YCG(); |
|  <br />float &YCB(); |
|  <br />int &Vrwr(); |
|  <br />int &Vrwg(); |
|  <br />int &Vrwb(); |
|  <br />float &Y0R(); |
|  <br />float &Y0G(); |
|  <br />float &Y0B(); |
|  <br />float &gammaR(); |
|  <br />float &gammaG(); |
|  <br />float &gammaB(); |
|  <br />float &B(); |
|  <br />float &P(); |
| </div> |
| <!--l. 57--><p class="nopar" > |
| <!--l. 59--><p class="indent" > Where <span class="obeylines-h"><span class="verb"><span |
| class="pcrr7t-">VDisplayType</span></span></span> is defined as: |
| |
| |
| |
| <div class="verbatim" id="verbatim-39"> |
| enum VDisplayType { |
|  <br />    BARCO, |
|  <br />    DUMB |
|  <br />}; |
| </div> |
| <!--l. 66--><p class="nopar" > |
| <!--l. 68--><p class="indent" > And <span class="obeylines-h"><span class="verb"><span |
| class="pcrr7t-">matrix</span></span></span> is defined as: |
| <div class="verbatim" id="verbatim-40"> |
| typedef float matrix[3][3]; |
| </div> |
| <!--l. 72--><p class="nopar" > |
| <!--l. 74--><p class="indent" > For a description of all the fields in a VIPS display |
| profile, see the manual page for <span class="obeylines-h"><span class="verb"><span |
| class="pcrr7t-">im_XYZ2RGB()</span></span></span>. |
| |
| |
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