Provides useful methods for converting images from one colour depth to another.
/*
* ConvertUtil.java
*
* Created on 12 May 2006, 09:22
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
//package net.sf.image4j.util;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.awt.image.ColorConvertOp;
import java.awt.image.DataBuffer;
import java.awt.image.IndexColorModel;
/**
* Provides useful methods for converting images from one colour depth to
* another.
*
* @author Ian McDonagh
*/
public class ConvertUtil {
/**
* Converts the source to 1-bit colour depth (monochrome). No transparency.
*
* @param src
* the source image to convert
* @return a copy of the source image with a 1-bit colour depth.
*/
public static BufferedImage convert1(BufferedImage src) {
IndexColorModel icm = new IndexColorModel(1, 2, new byte[] { (byte) 0,
(byte) 0xFF }, new byte[] { (byte) 0, (byte) 0xFF },
new byte[] { (byte) 0, (byte) 0xFF });
BufferedImage dest = new BufferedImage(src.getWidth(), src.getHeight(),
BufferedImage.TYPE_BYTE_BINARY, icm);
ColorConvertOp cco = new ColorConvertOp(src.getColorModel()
.getColorSpace(), dest.getColorModel().getColorSpace(), null);
cco.filter(src, dest);
return dest;
}
/**
* Converts the source image to 4-bit colour using the default 16-colour
* palette:
* <ul>
* <li>black</li>
* <li>dark red</li>
* <li>dark green</li>
* <li>dark yellow</li>
* <li>dark blue</li>
* <li>dark magenta</li>
* <li>dark cyan</li>
* <li>dark grey</li>
* <li>light grey</li>
* <li>red</li>
* <li>green</li>
* <li>yellow</li>
* <li>blue</li>
* <li>magenta</li>
* <li>cyan</li>
* <li>white</li>
* </ul>
* No transparency.
*
* @param src
* the source image to convert
* @return a copy of the source image with a 4-bit colour depth, with the
* default colour pallette
*/
public static BufferedImage convert4(BufferedImage src) {
int[] cmap = new int[] { 0x000000, 0x800000, 0x008000, 0x808000,
0x000080, 0x800080, 0x008080, 0x808080, 0xC0C0C0, 0xFF0000,
0x00FF00, 0xFFFF00, 0x0000FF, 0xFF00FF, 0x00FFFF, 0xFFFFFF };
return convert4(src, cmap);
}
/**
* Converts the source image to 4-bit colour using the given colour map. No
* transparency.
*
* @param src
* the source image to convert
* @param cmap
* the colour map, which should contain no more than 16 entries
* The entries are in the form RRGGBB (hex).
* @return a copy of the source image with a 4-bit colour depth, with the
* custom colour pallette
*/
public static BufferedImage convert4(BufferedImage src, int[] cmap) {
IndexColorModel icm = new IndexColorModel(4, cmap.length, cmap, 0,
false, Transparency.OPAQUE, DataBuffer.TYPE_BYTE);
BufferedImage dest = new BufferedImage(src.getWidth(), src.getHeight(),
BufferedImage.TYPE_BYTE_BINARY, icm);
ColorConvertOp cco = new ColorConvertOp(src.getColorModel()
.getColorSpace(), dest.getColorModel().getColorSpace(), null);
cco.filter(src, dest);
return dest;
}
/**
* Converts the source image to 8-bit colour using the default 256-colour
* palette. No transparency.
*
* @param src
* the source image to convert
* @return a copy of the source image with an 8-bit colour depth
*/
public static BufferedImage convert8(BufferedImage src) {
BufferedImage dest = new BufferedImage(src.getWidth(), src.getHeight(),
BufferedImage.TYPE_BYTE_INDEXED);
ColorConvertOp cco = new ColorConvertOp(src.getColorModel()
.getColorSpace(), dest.getColorModel().getColorSpace(), null);
cco.filter(src, dest);
return dest;
}
/**
* Converts the source image to 24-bit colour (RGB). No transparency.
*
* @param src
* the source image to convert
* @return a copy of the source image with a 24-bit colour depth
*/
public static BufferedImage convert24(BufferedImage src) {
BufferedImage dest = new BufferedImage(src.getWidth(), src.getHeight(),
BufferedImage.TYPE_INT_RGB);
ColorConvertOp cco = new ColorConvertOp(src.getColorModel()
.getColorSpace(), dest.getColorModel().getColorSpace(), null);
cco.filter(src, dest);
return dest;
}
/**
* Converts the source image to 32-bit colour with transparency (ARGB).
*
* @param src
* the source image to convert
* @return a copy of the source image with a 32-bit colour depth.
*/
public static BufferedImage convert32(BufferedImage src) {
BufferedImage dest = new BufferedImage(src.getWidth(), src.getHeight(),
BufferedImage.TYPE_INT_ARGB);
ColorConvertOp cco = new ColorConvertOp(src.getColorModel()
.getColorSpace(), dest.getColorModel().getColorSpace(), null);
cco.filter(src, dest);
return dest;
}
}
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