如何使用像素RGB值0到1在Java中编写PNG文件? [英] How to write PNG files in java using pixel RGB values 0 to 1?

问题描述

我正在用Java编写光线跟踪器，并且试图弄清楚如何将生成的图像写入PNG文件.到目前为止，我发现的所有示例都演示了如何使用BufferedImage创建PNG，但是它们都使用RGB值0至255.在我的代码中，我表示0至1之间的每个像素颜色值，例如洋红色为(1 ，0，1).我该如何编写具有此类值的PNG?

I am writing a ray tracer in java and I am trying to figure out how to write my generated image to a PNG file. So far, all the examples I have found demonstrate the use of BufferedImage to create a PNG, but they all use RGB values 0 to 255. In my code I represent each pixel colour value between 0 and 1, so for example magenta is (1, 0, 1). How can I go about writing a PNG with such values?

谢谢

推荐答案

如果将0到1之间的值乘以255，则会得到0到25​​5之间的数字.

If you multiply your value between 0 and 1 with 255, you'll get a number between 0 and 255.

注意:使用ImageIO API将BufferedImage写入PNG文件非常容易，它只是一行代码:

Note: Writing a BufferedImage to a PNG file is very easy with the ImageIO API, it's just one line of code:

import javax.imageio.ImageIO;

// ...

BufferedImage image = ...;

ImageIO.write(image, "png", new File("output.png"));

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