Fog creates a foggy image. The grayness can be varied from start to end by specifying startfog and endfog values. The density of fog is controlled by density. The effect of grayness and density values are not entirely independent. Some care need to be taken in selecting these %age values. Fogs appear differently on different occasions and modeling is not always satisfactory. RGB, YUY2 and Planar 8/9-16/32 bit depth formats are supported. Thread Safe. The parameters are described below

Details of parameters
Description Name Type Limits Default
clip clip none
Effect start frame number sf Integer within clip first frame
Effect end frame number ef Integer within clip last frame
Fogginess %age at start startfog integer 0 to 100 30
Fogginess %age at end endfog integer 0 to 100 startfog
fog density density integer 0 to 100 50

#Usage examples:-
fog(50, 150, 10,50,40)
fog(50,150, startfog=40)
fog(50,150,endfog=50, density=70)

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