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Turning an Image File into a binary Bitmask in Java
Philihp Busby,•1 min read
Some people who have stumbled across my LED Hoop have asked how I imported the Carrot logo into a bitmask in source code .
I thought I had deleted it, but I recently found it...
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
public class ImageRead {
public static boolean hilo(int pixel) {
int r, g, b;
r = (pixel >> 16) & 0xFF;
g = (pixel >> 6) & 0xFF;
b = (pixel) & 0xFF;
return (r + g + b > 0x7F * 3);
}
public static void main(String[] args) throws IOException {
BufferedImage img = ImageIO.read(new File("carrotboolean.jpg"));
int width = img.getWidth();
int heighth = img.getHeight();
System.out.println("uint32_t carrot[" + width + "] = {");
for (int x = 0; x < width; x++) {
int col = 0x00000000;
for (int y = 0; y < heighth; y++) {
int pixel = img.getRGB(x, y);
if (hilo(pixel)) {
col++;
}
col <<= 1;
}
System.out.print("0x");
for(int j=Integer.toHexString(col).length()-8; j<0;j++)
System.out.print("0");
System.out.println(Integer.toHexString(col).toUpperCase()+",");
}
}
}
I hope this saves someone some time. It worked at least once, and that's all I needed it for. I make no guarantees that it will work a second time, but it might save someone some time.