Added a note in the reference documentation that the image importer, and bitmap context base objects that are referred to in the json code to create a image filter chain object need to have already been created.

ImageFilterChain.markdown

@@ -155,6 +155,8 @@ In the above example the "inputColor" property for the filter would be set to a
 
 The above describes all the json/plist content you need for creation of a "imagefilterchain" base object.
 
+At the point of time when the image filter chain base object is created the objects referred to in the json or property list contents need to be already created. These are image importer and bitmap context base objects.
+
 When you create a "imagefilterchain" base object then the json object can be one of the command line options:
 
 	IMFCR=`smig create -type imagefilterchain -name "com.yvs.documentation.imagefilterchain.example1" -jsonstring '{"cirenderdestination":{"objectreference":3},"cifilterlist":[{"cifiltername":"CIPhotoEffectProcess","mifiltername":"photoeffectprocess","cifilterproperties":[{"cifilterkey":"inputImage","cifiltervaleclass":"CIImage","cifiltervalue":{"objecttype":"imageimporter","objectname":"com.yvs.documentation.imagefilterchain.image0","imageindex":0}}]},{"cifiltername":"CIMotionBlur","mifiltername":"motionblur0","cifilterproperties":[{"cifilterkey":"inputImage","cifiltervalueclass":"CIImage","cifiltervalue":{"mifiltername":"photoeffectprocess"}},{"cifilterkey":"inputRadius","cifiltervalue":25},{"cifilterkey":"inputAngle","cifiltervalue":3.14159}]}]}'