After image binarization, BufferedImage setRGB, written to a local, black pixels and white pixels of-CodePudding

 
Public static BufferedImage binary (BufferedImage sourceImg) throws IOException {
Int width=sourceImg. GetWidth (); 
Int height=sourceImg. GetHeight (); 

//gray 
Int [] [] grayBits=new int [width] [height]; 
For (int I=0; I & lt; Width; I++) {
For (int j=0; J & lt; Height; J++) {
GrayBits [I] [j]=calcGray (sourceImg. GetRGB (I, j)); 
} 
} 

//threshold 
Int threshold=thresholdOTSU (grayBits, width, height); 

Int white=new Color (255, 255, 255). GetRGB (); 
Int black=new Color (0, 0, 0). GetRGB (); 

BufferedImage bf=new BufferedImage (width, height, TYPE_BYTE_BINARY); 
For (int I=0; I & lt; Width; I++) {
For (int j=0; J & lt; Height; J++) {
If (grayBits [I] [j] & gt; Threshold) {
Bf. SetRGB (I, j, white); 
} else {
Bf. SetRGB (I, j, black); 
} 
} 
} 
Return the bf; 
}

The original

After the two values:

After enlarged area, with gray color part is:

In bf. SetRGB () when they read the output color values, all of them are (0, 0) and (255255255), how will there be any other color, bosses some directions, thank!!!!!!

CodePudding user response:

Pit B

 
ImageIO. Write (binary (image), "JPG", the new File (" 1. JPG "));

Use ImageIO. Write output JPG format, the image quality loss, output PNG is

 
ImageIO. Write (binary (image), "PNG", the new File (" 1. PNG "));