Filter Attributes
Core Image filters have a flexible approach to customization. All instances of CIFilter have a dictionary property called attributes that contains information about the filter and all the customizations to the filter. Instances of CIFilter have a property called inputKeys, which lists the keys of each customizable input item, and a property called outputKeys, which lists the output items from the filter.
The sample app has specialized table cells to enable the user to see what attributes are available for a selected filter, adjust those attributes, and preview the image based on the current attribute parameters, as shown in Figure 19.5.
Figure 19.5 Sample app: Add Color Monochrome Filter, Filter Attributes.
Each attribute ...
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