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:

                        http://developer.apple.com/contact/feedback.html

                        Please submit any bug reports about this example to 

                        http://developer.apple.com/bugreport