cifilter.app
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Support optional parameters
As noted in https://developer.apple.com/videos/play/wwdc2017/508/?time=1279, CIDepthBlurEffect has several optional parameters. We should try to figure out which ones are optional and note them.
Unfortunately there doesn't seem to be any way, via the CIFilter API, to figure out which parameters are optional. This might have to wait due to this issue.