如何设置颜色的R，G，B和Alpha分量？ [英] How do I set the R, G, B and Alpha components of a color?

问题描述

有3个整数值构成RGB值，我也有颜色的Alpha分量值。如何设置这4个值以获得所需的颜色

There are 3 integer values that makes up a RGB value, and also i have the Alpha component value of the color. how do i set these 4 values to get the desired colour

推荐答案

您可以创建 颜色 对象（值应该是 0 - 255 或 浮动 s 0f - 1f ：

You can create a Color object (the values should either be ints between 0-255 or floats between 0f-1f:

Color c = new Color(red, green, blue, alpha);

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如果你想用这种颜色绘制图像： / p>

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If you want to paint an image with that color:

BufferedImage image = new BufferedImage(300, 200, BufferedImage.TYPE_INT_ARGB);
Graphics graphics = image.getGraphics(); 
graphics.setColor(c);
graphics.fillRect(50, 50, 100, 100);
graphics.dispose();

如果你只想设置一个像素（颜色模型必须是ARGB）：

If you only want to set a pixel (color model must be ARGB):

image.setRGB(50, 50, c.getRGB());

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