convert RGBA To GIF - Java 2D Graphics

Java examples for 2D Graphics:GIF

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Description

convert RGBA To GIF

Demo Code


//package com.java2s;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.awt.image.IndexColorModel;
import java.awt.image.WritableRaster;

public class Main {
    public static BufferedImage convertRGBAToGIF(final BufferedImage src,
            final int transColor) {
        BufferedImage dst = new BufferedImage(src.getWidth(),
                src.getHeight(), BufferedImage.TYPE_BYTE_INDEXED);
        final Graphics g = dst.getGraphics();
        g.setColor(new Color(transColor));
        g.fillRect(0, 0, dst.getWidth(), dst.getHeight());
        {//from w  w w .jav a2s  .c  o  m
            final IndexColorModel indexedModel = (IndexColorModel) dst
                    .getColorModel();
            final WritableRaster raster = dst.getRaster();
            final int sample = raster.getSample(0, 0, 0);
            final int size = indexedModel.getMapSize();
            final byte[] rr = new byte[size];
            final byte[] gg = new byte[size];
            final byte[] bb = new byte[size];
            indexedModel.getReds(rr);
            indexedModel.getGreens(gg);
            indexedModel.getBlues(bb);
            final IndexColorModel newModel = new IndexColorModel(8, size,
                    rr, gg, bb, sample);
            dst = new BufferedImage(newModel, raster,
                    dst.isAlphaPremultiplied(), null);
        }
        dst.createGraphics().drawImage(src, 0, 0, null);
        return dst;
    }
}

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