Java BufferedImage to Transparent makeTransparentEdges(BufferedImage src)

Description

make Transparent Edges

License

Open Source License

Declaration

public static BufferedImage makeTransparentEdges(BufferedImage src) 

Method Source Code

//package com.java2s;
/*/*w ww  . j av a 2s .  com*/
JPC: A x86 PC Hardware Emulator for a pure Java Virtual Machine
Release Version 2.0
    
A project from the Physics Dept, The University of Oxford
    
Copyright (C) 2007 Isis Innovation Limited
    
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as published by
the Free Software Foundation.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
    
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
     
Details (including contact information) can be found at: 
    
www.physics.ox.ac.uk/jpc
*/

import java.awt.Color;

import java.awt.image.BufferedImage;

public class Main {
    public static BufferedImage makeTransparentEdges(BufferedImage src) {
        return makeTransparentEdges(src, 0, null);
    }

    public static BufferedImage makeTransparentEdges(BufferedImage src, float fraction, Color blend) {
        BufferedImage result = new BufferedImage(src.getWidth(), src.getHeight(), BufferedImage.TYPE_INT_ARGB);

        int bg = src.getRGB(0, 0);
        float r1 = 0, g1 = 0, b1 = 0;
        if (blend != null) {
            r1 = blend.getRed() * (1 - fraction);
            g1 = blend.getGreen() * (1 - fraction);
            b1 = blend.getBlue() * (1 - fraction);
        }

        for (int i = 0; i < src.getWidth(); i++)
            for (int j = 0; j < src.getHeight(); j++) {
                int rgb = src.getRGB(i, j);
                if (rgb == bg)
                    result.setRGB(i, j, 0x00000000);
                else {
                    if (blend != null) {
                        int a = blend.getAlpha();
                        int r = 0xFF & (rgb >> 16);
                        int g = 0xFF & (rgb >> 8);
                        int b = 0xFF & rgb;

                        r = (int) (fraction * r + r1);
                        g = (int) (fraction * g + g1);
                        b = (int) (fraction * b + b1);

                        rgb = (a << 24) | (r << 16) | (g << 8) | b;
                    }

                    result.setRGB(i, j, rgb);
                }
            }

        return result;
    }
}

Related

1. makeColorTransparent(Image im, final Color color)
2. makeColorTransparent(Image image, final Color transparentColor)
3. makeTranslucentImage(BufferedImage image, float transparency)
4. makeTransparent(BufferedImage image, int x, int y)
5. makeTransparent(BufferedImage img, Color trColor)