/
Engraver.java
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/
Engraver.java
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/*
*
* Copyright 2016 Lawrence Kesteloot
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
// Copyright 2011 Lawrence Kesteloot
package com.teamten.image;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
/**
* Turns a photo into an engraved drawing.
*/
public class Engraver {
public BufferedImage run(BufferedImage image) {
int width = image.getWidth();
int height = image.getHeight();
int pixelCount = width*height;
int bytesPerPixel = ImageUtils.getBytesPerPixel(image);
// Convert to black and white.
image = ImageUtils.toGrayscale(image);
// Blur slightly.
image = ImageUtils.blur(image, 2);
byte[] data = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
for (int i = 0; i < pixelCount; i++) {
int x = i % width;
int y = i / width;
// Normalized coordinates.
double fx = (double) x / width;
double fy = (double) y / width; // Keep aspect ratio.
// Coons patch.
fx += Math.sin(fy*10)*0.05;
// Get source level.
int index = i*bytesPerPixel;
double gray = ((int) data[index] & 0xFF)/255.0;
// Increase contrast.
double contrast = 2.0;
gray = (gray - 0.5)*contrast + 0.5;
gray = Math.max(0, Math.min(1, gray));
// gray = 0..1
double value = pattern(fx, fy, gray);
value = Math.max(0, Math.min(1, value));
byte out = (byte) (int) (value*255.5);
data[index + 0] = out;
data[index + 1] = out;
data[index + 2] = out;
}
return image;
}
private double pattern(double x, double y, double gray) {
// x,y 0..1 (roughly)
// gray 0..1
double t = (x + y)*2881.0/5.0;
double copperplate = Math.sin(t)/2.1 + 0.5;
// copperplate 0..1
if (gray <= copperplate) {
return 0.0;
} else {
return 1.0;
}
}
}