IllegalArgumentException: Color parameter outside of expected range: Red Green Blue

Question

when I tested my code with JUnit, the following error occured:

java.lang.IllegalArgumentException: Color parameter outside of expected range: Red Green Blue


        

Answer 1

You are calling the Color constructor with three float parameters so the values are allowed to be between 0.0 and 1.0.

But color.getRed() (Blue, Green) can return a value up to 255. So you can get the following:

float greyscale = ((0.299f *255) + (0.587f * 255) + (0.144f * 255));
System.out.println(greyscale); //262.65

Which is far to high for 1.0f and even for 252 which the Color(int,int,int) constructor allows. So scale your factors like dasblinkenlight said and cast the greyscale to an int or else you will call the wrong constructor of Color.`

new Color((int)greyscale,(int)greyscale,(int)greyscale);