如何创建彩色照片转换为灰度并由java保存 [英] How to create a color photo convert to grayscale and save by java

问题描述

我不知道我的代码在哪里做错了，问题不在于保存。请帮助



我的尝试：

i dont know where my code did wrong, the problem is not save . pls help

What I have tried:

import java.io.*;

public class GrayScaleConverter {
	
	public ImageResource makeGray(ImageResource inImage) {
		ImageResource outImage = new ImageResource(inImage.getWidth(), inImage.getHeight());
		
		for (Pixel pixel: outImage.pixels()) {
			Pixel inPixel = inImage.getPixel(pixel.getX(), pixel.getY());
			int average = (inPixel.getRed() + inPixel.getBlue() + inPixel.getGreen())/3;
			pixel.setRed(average);
			pixel.setGreen(average);
			pixel.setBlue(average);
		}
		
		return outImage;
	}

	public void selectAndConvert () {
		DirectoryResource dr = new DirectoryResource();
		for (File f : dr.selectedFiles()) {
			ImageResource inImage = new ImageResource(f);
			ImageResource gray = makeGray(inImage);
			String fname = gray.getFileName();
			String newName = "copy-" + fname;
			gray.setFileName(newName);
			gray.draw();
			gray.save();
		}
	}
}

推荐答案

您的 ImageResource 返回的c $ c> makeGray（）没有文件名，因为它已在内存中创建并且 setFileName（）没有被要求它。



请改用输入文件的名称：

Your ImageResource returned from makeGray() does not have a file name because it has been created in memory and setFileName() has not been called for it.

Use the name of the input file instead:

gray.setFileName(f.getParent() + f.pathSeperator + "copy-" + f.GetName());

如果你需要将文件保存在不同的目录中，请使用而不是 f.getParent（）。

If you need to save the file in a different directory use that instead of f.getParent().

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