解决方法
我刚刚写了一个工作示例.给出以下输入图像img.png.
import java.awt.*; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; class Convert { public static void main(String[] args) { invertimage("img.png"); } public static void invertimage(String imageName) { BufferedImage inputFile = null; try { inputFile = ImageIO.read(new File(imageName)); } catch (IOException e) { e.printstacktrace(); } for (int x = 0; x < inputFile.getWidth(); x++) { for (int y = 0; y < inputFile.getHeight(); y++) { int rgba = inputFile.getRGB(x,y); Color col = new Color(rgba,true); col = new Color(255 - col.getRed(),255 - col.getGreen(),255 - col.getBlue()); inputFile.setRGB(x,y,col.getRGB()); } } try { File outputFile = new File("invert-"+imageName); ImageIO.write(inputFile,"png",outputFile); } catch (IOException e) { e.printstacktrace(); } } }
如果要创建单色图像,可以将col的计算改为如下:
int MONO_THRESHOLD = 368; if (col.getRed() + col.getGreen() + col.getBlue() > MONO_THRESHOLD) col = new Color(255,255,255); else col = new Color(0,0);
以上将给您以下图像