To use +filterWithName:keysAndValues:, I have to be careful to
include certain "required" keys before I chain the filters, or I get
runtime errors like:
An uncaught exception was raised
CIUnsharpMask: sharpen: nil value for argument #2 (scale)
*** Uncaught exception: <CIKernelNilArgument> CIUnsharpMask:
sharpen: nil value for argument #2 (scale)
Program has exited due to signal 5 (SIGTRAP).
In this case, the CIUnsharpMask filter requires "inputImage" and
"inputIntensity" but not "inputRadius" (I can leave it out). Who is
to know? There are many like this. How can I know which keys are
required?
If CIFilter +filterWithName:keysAndValues: can invoke -setDefaults,
then it is much easier to set up a chain of filters, since I only
need to use this one method, and I don't need to supply values for
all of the keys at this point.
Roland
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