Copyright © 2007-2009 by Apple Inc.  All Rights Reserved.
Quartz Composer Plugin
HistogramOperation              A Quartz Composer plug-in that alters a source image 
                        according to the histogram of another image.
Sample Requirements             The plugin was created using the Xcode editor running 
                        under Mac OS X 10.6.x or later. 
About the sample                A Quartz Composer plug-in that implements a custom 
                        processor patch that alters an image according to the 
                        histogram of another image using the vImage framework.
Using the Sample                Open the project using the Xcode editor which can be found 
                        in /Developer/Applications. From the main menu, 
                        choose "Project", set "Active Configuration" to "Release", 
                        and "Active Target" to "Build & Copy".  These settings are
                        also available from the top left corner of the 'Overview' 
                        pull-down window. Build the project. Once the build has 
                        completed successfully, the plug-in can be used as a 
                        regular QC patch in the Quartz Composer editor (also 
                        installed under /Developer/Applications), by selecting it 
                        from the Library - Plugin panel.
                        The image whose histogram is going to be changed is in the 
                        plug-in input parameter "Source Image". The image whose 
                        histogram will influence the result is in input parameter 
                        "Histogram Image".
Installation                    n/a
Changes from Previous Versions          n/a
Feedback and Bug Reports            Please send all feedback about this sample to:
                        Please submit any bug reports about this example to