How does photoshop calculate the “average blur” (average color) of an image?

问题

This is what photoshop produces for the "average blur" of the Mona Lisa image for each respective quarter. What is the algorithm for doing so? I am looking to replicate it in a simple manner.:

Thanks.

回答1:

There is no way to be sure of that unless you can get the source code of Photoshop but the usual way to do this is to :

• add all the r, g, b values of every pixel in the quarter;
• divide the sum of those values by the number of pixel in the quarter;
• create a new color with the resulting r, g, b values.

This new color is the average color of the quarter.

For more information and complete code look here.

来源：https://stackoverflow.com/questions/26498619/how-does-photoshop-calculate-the-average-blur-average-color-of-an-image