如何在 Java 中将 getRGB(x,y) 整数像素转换为 Color(r,g,b,a)？
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How to convert getRGB(x,y) integer pixel to Color(r,g,b,a) in Java?
提问by Gabriel A. Zorrilla
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, -16726016should be Color(0,200,0,255). Any tips?
我有我从中获得的整数像素getRGB(x,y)，但我不知道如何将其转换为 RGBA 格式。例如，-16726016应该是Color(0,200,0,255)。有小费吗？
采纳答案by AKX
If I'm guessing right, what you get back is an unsigned integer of the form 0xAARRGGBB, so
如果我猜对了，你得到的是一个无符号整数形式0xAARRGGBB，所以
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 docssays that you can just do
将提取颜色成分。但是，快速查看文档说你可以做
Color c = new Color(argb);
or
或者
Color c = new Color(argb, true);
if you want the alpha component in the Color as well.
如果您还想要颜色中的 alpha 组件。
UPDATE
更新
Red and Blue components are inverted in original answer, so the right answer will be:
红色和蓝色分量在原始答案中颠倒了，所以正确的答案是：
int r = (argb>>16)&0xFF;
int g = (argb>>8)&0xFF;
int b = (argb>>0)&0xFF;
updated also in the first piece of code
也在第一段代码中更新
回答by laher
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:
打印出来：
0
200
0
255
Is that what you mean?
你是这个意思吗？
