java 抠图
时间简易抠图（例如手机拍照去除背景色）
色差范围0-255 自己定义
//色差范围0~255
//public static int color_range = 210;//
public static int color_range = 100;//核心代码
public static void main(String[] args) throws Exception{
BufferedImage image = ImageIO.read(new File("C:/Users/Administrator/Desktop/透明印章/a1.png"));
// 高度和宽度
int height = image.getHeight();
int width = image.getWidth();
// 生产背景透明和内容透明的图片
ImageIcon imageIcon = new ImageIcon(image);
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics(); // 获取画笔
g2D.drawImage(imageIcon.getImage(), 0, 0, null); // 绘制Image的图片，使用了imageIcon.getImage()，目的就是得到image,直接使用image就可以的
int i=1;
int alpha = 0; // 图片透明度
// 外层遍历是Y轴的像素
for (int y = bufferedImage.getMinY(); y < bufferedImage.getHeight(); y++) {
// 内层遍历是X轴的像素
for (int x = bufferedImage.getMinX(); x < bufferedImage.getWidth(); x++) {
int rgb = bufferedImage.getRGB(x, y);
// 对当前颜色判断是否在指定区间内
if (colorInRange(rgb)){
// #AARRGGBB 最前两位为透明度
rgb = (alpha << 24) | (rgb & 0x00ffffff);
bufferedImage.setRGB(x, y, rgb);
alpha = 0;
}else{
// 设置为不透明
alpha = 255;
// #AARRGGBB 最前两位为透明度
rgb = (alpha << 24) | (0xff0000);//红色构图
//rgb = (alpha << 24) | (0x000000);//黑色构图
bufferedImage.setRGB(x, y, rgb);
}
}
}
// 绘制设置了RGB的新图片,这一步感觉不用也可以只是透明地方的深浅有变化而已，就像蒙了两层的感觉
g2D.drawImage(bufferedImage, 0, 0, null);
// 生成图片为PNG
ImageIO.write(bufferedImage, "png", new File("C:/Users/Administrator/Desktop/透明印章/result.png"));
}
// 判断是背景还是内容
public static boolean colorInRange(int color) {
int red = (color & 0xff0000) >> 16;// 获取color(RGB)中R位
int green = (color & 0x00ff00) >> 8;// 获取color(RGB)中G位
int blue = (color & 0x0000ff);// 获取color(RGB)中B位
//System.out.println("red=="+red +"green=="+green +"blue=="+blue);
// 通过RGB三分量来判断当前颜色是否在指定的颜色区间内
if (red >= color_range && green >= color_range && blue >= color_range){
return true;
}
System.out.println("red**"+red +"green**"+green +"blue**"+blue);
return false;
}颜色对照表
"black"=>array( 0x000000),黑色
"maroon"=>array( 0x800000), 栗色
"green"=>array( 0x008000), 绿色
"olive"=>array( 0x808000), 橄榄色
"navy"=>array( 0x000080), 藏青色
"purple"=>array( 0x800080), 紫色
"teal"=>array( 0x008080), 凫蓝：适度或深色的带蓝色的绿色到呈绿色的蓝色
"gray"=>array( 0x808080), 灰色
"silver"=>array( 0xC0C0C0), 银色
"red"=>array( 0xFF0000), 红色
"lime"=>array( 0x00FF00),
"yellow"=>array( 0xFFFF00), 黄色
"blue"=>array( 0x0000FF), 蓝色
"fuchsia"=>array( 0xFF00FF), 紫红
"aqua"=>array( 0x00FFFF), 浅绿色
"white"=>array( 0xFFFFFF), 白色 Netscape and IE所附加定义的颜色
"aliceblue"=>array( 0xF0F8FF),
"antiquewhite"=>array( 0xFAEBD7),
"aquamarine"=>array( 0x7FFFD4),
"azure"=>array( 0xF0FFFF),
"beige"=>array( 0xF5F5DC),
"blueviolet"=>array( 0x8A2BE2),
"brown"=>array( 0xA52A2A),
"burlywood"=>array( 0xDEB887),
"cadetblue"=>array( 0x5F9EA0),
"chartreuse"=>array( 0x7FFF00),
"chocolate"=>array( 0xD2691E),
"coral"=>array( 0xFF7F50),
"cornflowerblue"=>array( 0x6495ED),
"cornsilk"=>array( 0xFFF8DC),
"crimson"=>array( 0xDC143C),
"darkblue"=>array( 0x00008B),
"darkcyan"=>array( 0x008B8B),
"darkgoldenrod"=>array( 0xB8860B),
"darkgray"=>array( 0xA9A9A9),
"darkgreen"=>array( 0x006400),
"darkkhaki"=>array( 0xBDB76B),
"darkmagenta"=>array( 0x8B008B),
"darkolivegreen"=>array( 0x556B2F),
"darkorange"=>array( 0xFF8C00),
"darkorchid"=>array( 0x9932CC),
"darkred"=>array( 0x8B0000),
"darksalmon"=>array( 0xE9967A),
"darkseagreen"=>array( 0x8FBC8F),
"darkslateblue"=>array( 0x483D8B),
"darkslategray"=>array( 0x2F4F4F),
"darkturquoise"=>array( 0x00CED1),
"darkviolet"=>array( 0x9400D3),
"deeppink"=>array( 0xFF1493),
"deepskyblue"=>array( 0x00BFFF),
"dimgray"=>array( 0x696969),
"dodgerblue"=>array( 0x1E90FF),
"firebrick"=>array( 0xB22222),
"floralwhite"=>array( 0xFxFAF0),
"forestgreen"=>array( 0x228B22),
"gainsboro"=>array( 0xDCDCDC),
"ghostwhite"=>array( 0xF8F8FF),
"gold"=>array( 0xFFD700),
"goldenrod"=>array( 0xDAA520),
"greenyellow"=>array( 0xADFF2F),
"honeydew"=>array( 0xF0FFF0),
"hotpink"=>array( 0xFF69B4),
"indianred"=>array( 0xCD5C5C),
"indigo"=>array( 0x4B0082),
"ivory"=>array( 0xFFFFF0),
"khaki"=>array( 0xF0E68C),
"lavender"=>array( 0xE6E6FA),
"lavenderblush"=>array( 0xFFF0F5),
"lawngreen"=>array( 0x7CFC00),
"lemonchiffon"=>array( 0xFFFACD),
"lightblue"=>array( 0xADD8E6),
"lightcoral"=>array( 0xF08080),
"lightcyan"=>array( 0xE0FFFF),
"lightgoldenrodyellow"=>array( 0xFAFAD2),
"lightgreen"=>array( 0x90EE90),
"lightgrey"=>array( 0xD3D3D3),
"lightpink"=>array( 0xFFB6C1),
"lightsalmon"=>array( 0xFFA07A),
"lightseagreen"=>array( 0x20B2AA),
"lightskyblue"=>array( 0x87CEFA),
"lightslategray"=>array( 0x778899),
"lightsteelblue"=>array( 0xB0C4DE),
"lightyellow"=>array( 0xFFFFE0),
"limegreen"=>array( 0x32CD32),
"linen"=>array( 0xFAF0E6),
"mediumaquamarine"=>array( 0x66CDAA),
"mediumblue"=>array( 0x0000CD),
"mediumorchid"=>array( 0xBA55D3),
"mediumpurple"=>array( 0x9370D0),
"mediumseagreen"=>array( 0x3CB371),
"mediumslateblue"=>array( 0x7B68EE),
"mediumspringgreen"=>array( 0x00FA9A),
"mediumturquoise"=>array( 0x48D1CC),
"mediumvioletred"=>array( 0xC71585),
"midnightblue"=>array( 0x191970),
"mintcream"=>array( 0xF5FFFA),
"mistyrose"=>array( 0xFFE4E1),
"moccasin"=>array( 0xFFE4B5),
"navajowhite"=>array( 0xFFDEAD),
"oldlace"=>array( 0xFDF5E6),
"olivedrab"=>array( 0x6B8E23),
"orange"=>array( 0xFFA500),
"orangered"=>array( 0xFF4500),
"orchid"=>array( 0xDA70D6),
"palegoldenrod"=>array( 0xEEE8AA),
"palegreen"=>array( 0x98FB98),
"paleturquoise"=>array( 0xAFEEEE),
"palevioletred"=>array( 0xDB7093),
"papayawhip"=>array( 0xFFEFD5),
"peachpuff"=>array( 0xFFDAB9),
"peru"=>array( 0xCD853F),
"pink"=>array( 0xFFC0CB),
"plum"=>array( 0xDDA0DD),
"powderblue"=>array( 0xB0E0E6),
"rosybrown"=>array( 0xBC8F8F),
"royalblue"=>array( 0x4169E1),
"saddlebrown"=>array( 0x8B4513),
"salmon"=>array( 0xFA8072),
"sandybrown"=>array( 0xF4A460),
"seagreen"=>array( 0x2E8B57),
"seashell"=>array( 0xFFF5EE),
"sienna"=>array( 0xA0522D),
"skyblue"=>array( 0x87CEEB),
"slateblue"=>array( 0x6A5ACD),
"slategray"=>array( 0x708090),
"snow"=>array( 0xFFFAFA),
"springgreen"=>array( 0x00Fx7F),
"steelblue"=>array( 0x4682B4),
"tan"=>array( 0xD2B48C),
"thistle"=>array( 0xD8BFD8),
"tomato"=>array( 0xFF6347),
"turquoise"=>array( 0x40E0D0),
"violet"=>array( 0xEE82EE),
"wheat"=>array( 0xF5DEB3),
"whitesmoke"=>array( 0xF5F5F5),
"yellowgreen"=>array( 0x9ACD32));示例图片1
示例图片2
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