e663. 在gif图像中获取透明和色彩的数量

A IndexColorModel is used to represent the color table of a GIF image.

    // Get GIF image
    Image image = new ImageIcon("image.gif").getImage();

    // Get the color model; this method is implemented in
    // e662 取的图像的色彩模型
    IndexColorModel colorModel = (IndexColorModel)getColorModel(image);

    // Get transparent pixel
    int trans = colorModel.getTransparentPixel();
    if (trans == -1) {
        // There is no transparent pixel
    }

    // Get the number of colors
    int numColors = colorModel.getMapSize();

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