Terminal image viewer

README.md

Image Viewer

This snippet is not really useful in its current state, but demonstrates how images can be printed to the terminal.

Requirements

• A terminal that supports RGB, like KDEs konsole

ImageViewer.java

import java.lang.System;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.io.File;

public class ImageViewer {

    private static final char[] chars = new char[] {' ', '\u2581', '\u2582', '\u2583', '\u2584', '\u2585', '\u2586', '\u2587', '\u2588'};

    private static final char getChar(int alpha) {
        return chars[Math.min((alpha * chars.length) / 255, 8)];
    }

    public static void main(String[] args) throws Exception {
        StringBuilder builder = new StringBuilder();

        BufferedImage image = ImageIO.read(new File(args[0]));

        for (int y = 0; y < image.getHeight(); y++) {
            for (int x = 0; x < image.getWidth(); x++) {
                int color = image.getRGB(x,y);

                builder.append("\u001b[38;2;");
                builder.append(String.valueOf((color >> 16) & 0xFF));
                builder.append(';');
                builder.append(String.valueOf((color >> 8) & 0xFF));
                builder.append(';');
                builder.append(String.valueOf(color & 0xFF));
                builder.append('m');
                builder.append(getChar((color >>> 24) & 0xFF));
            }

            builder.append('\n');
        }

        System.out.print(builder.toString());
    }
}