Document Revision History

Corrected code line c[3] = rgb[3] * alpha in Listing 5-3 to read simply c[3] = alpha.

Updated the introduction chapter.

Added chapters on face detection and auto enhancement filters.

Added information on performance best practices.

Added recipes for subclassing CIFilter to get custom effects.

Moved information on using the CIImageAccumulator class to its own chapter and revised the content to bring it up to date.

Added clarification on naming input parameters for custom filters.

Added information on thread safety.

Fixed broken link to external article.

Added information to “Building a Dictionary of Filters.”

Added a note to “Building a Dictionary of Filters.”

Add information about CIFilter Image Kit Additions.

Added information about support for RAW images.

Updated links to references and added links in several places to Image Unit Tutorial.

Revised “Executable and Nonexecutable Filters.”

Revised “Write an Output Image Method.”

Removed section on memory management. Instead, see Advanced Memory Management Programming Guide.

Added a note to “Building a Dictionary of Filters.”

Fixed a typographical error.

Corrected the angular values for colors in “Creating a CIFilter Object and Setting Values.”

Removed the appendix “Core Image Filters” and created a new document named Core Image Filter Reference.

Removed the appendix “Core Image Kernel Language” and created a new document named Core Image Kernel Language Reference.

Added “Kernel Routine Examples” to “Creating Custom Filters” and changed some of the short variable names to long ones in the code listings. Added information to “Computing a Hole Distortion” to clarify the purpose of the example.

Moved information about packaging filters as image units into its own chapter. Added additional information about the files needed in the project and where to install the image unit. See “Before You Get Started,” “Build and Test the Image Unit,” and “See Also.”

Updated the book introduction and some of the chapter introductions to reflect the chapter and appendix changes.

Revised “Creating Custom Filters.” In particular, see “Write a Custom Attributes Method” and “Register the Filter.”

Added additional information on how to create nonexecutable filters. See “Writing Nonexecutable Filters.”

Revised information on creating a CIContext object from an OpenGL graphics context.

Fixed formatting and, in online versions of this document, provided hyperlinks to the image creation functions in Table 1-3.

Added hyperlinks to most symbols and to sample code available in the ADC Reference Library.

Numerous small formatting and grammatical changes throughout.

Changed the title from Image Processing With Core Image to make it more consistent with the titles of similar documentation.

Completely revised “Querying the System for Filters” to provide more in-depth information about how Core Image works.

Split the chapter titled Core Image Tasks into two chapters: “Processing Images” and “Creating Custom Filters.” Completely updated the content in each to reflect additions to the API and to provide more in-depth information.

Added “Using Transition Effects.”

Added “Using Feedback to Process Images.”

Added “Applying a Filter to Video.”

Added “Expressing Image Processing Operations in Core Image.”

Added “Use Quartz Composer to Test the Kernel Routine.”

Provided more information on the region of interest and ROI functions. See “The Region of Interest” and “Supplying an ROI Function.”

Provided more information on executable and nonexecutable filters. See “Executable and Nonexecutable Filters” and “Writing Nonexecutable Filters.”

Updated the appendix “Core Image Filters to include recently-added built-in Core Image filters. Also replaced many of the figures to provide a better idea of the result produced by a filter.

Updated the appendix “Core Image Kernel Language” to reflect changes in the kernel language. Added explanations for the kernel routine examples.

New seed draft that describes an image processing technology, built into OS X v10.4, that provides access to built-in image filters for both video and still images and support for custom filters and real-time processing.