Flash 8.
filter.brightness
Property; a float value that specifies the brightness of the filter. Acceptable values are between -100 and 100. This property is defined for Filter objects with a value of "adjustColorFilter" for the filter.name property.
The following example sets the brightness to 30.5 for the Adjust Color filters on the selected object(s):
var myFilters = fl.getDocumentDOM().getFilters();
for(i=0; i < myFilters.length; i++){
if(myFilters[i].name == 'adjustColorFilter'){
myFilters[i].brightness = 30.5;
}
}
fl.getDocumentDOM().setFilters(myFilters);