如何在Java中将getRGB（x，y）整数像素转换为Color（r，g，b，a）？

Question

I have the integer pixel I got from getRGB(x,y) , but I don't have any clue about how to convert it to RGBA format. For example, -16726016 should be Color(0,200,0,255) . Any tips?

Answer 1

If I'm guessing right, what you get back is an unsigned integer of the form 0xAARRGGBB , so

int b = (argb)&0xFF;
int g = (argb>>8)&0xFF;
int r = (argb>>16)&0xFF;
int a = (argb>>24)&0xFF;

would extract the color components. However, a quick look at the docs says that you can just do

Color c = new Color(argb);

or

Color c = new Color(argb, true);

if you want the alpha component in the Color as well.

UPDATE

Red and Blue components are inverted in original answer, so the right answer will be:

int r = (argb>>16)&0xFF;
int g = (argb>>8)&0xFF;
int b = (argb>>0)&0xFF;

updated also in the first piece of code

Answer 2

    Color c = new Color(-16726016, true);
    System.out.println(c.getRed());
    System.out.println(c.getGreen());
    System.out.println(c.getBlue());
    System.out.println(c.getAlpha());

prints out:

0
200
0
255

Is that what you mean?