The brightness and contrast allows you to control the overall values of brightness and contrast in images or sequences.
The QTPlgEffectBrightnessContrastDesc class implements methods and properties to setup programmatically the parameters of the brightness and contrast effect provided natively by QuickTime.
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The QTPlgEffectBrightnessContrastDesc class constructors are called when you create a new instance of the class, while the ˜QTPlgEffectBrightnessContrastDesc class destructor, is called automatically when the class is no more in use. Also, you can invoke the class destructor by setting the instance of the class to nil.
Once a new class instance is returned, it is good practice to check the class property to be sure that the new object can be used. For discussion about the validity of an effect description instance see the documentation relative to the .
The class provides you with the following initializer methods:
()
This is the default constructor. Use this constructor to create a completely new data descriptor container in memory.
(other as )
This is the copy constructor. The properties of the object to be copied will be used to initialize the
new class instance properties. Note that the parameter passed is a generic object; this is due to the
fact that you could use a descriptor obtained by the that returns a generic
. Anyway, the class makes a
control to check if the passed object is suitable for use and, if not, will initialize the class instance with default values
determines the brigthness to apply to the data. The values can range from –100 to
+100 with 0 meaning no change
determines the contrast to apply to the data. The values can range from –100 to
+100 with 0 meaning no change