我怎么能用java像素化jpg？

Question

我正在尝试使用Java 6对JPEG进行像素化并且没有太多运气.它需要与Java一起 - 不是像Photoshop那样的图像处理程序,它需要看起来像老学校 - 像这样:

有谁能够帮我？

Answer 1

使用java.awt.image(javadoc)和javax.imageio(javadoc)API,您可以轻松地遍历图像的像素并自己执行像素化.

示例代码如下.您将需要至少这些进口:javax.imageio.ImageIO,java.awt.image.BufferedImage,java.awt.image.Raster,java.awt.image.WritableRaster,和java.io.File.

例:

// How big should the pixelations be?
final int PIX_SIZE = 10;

// Read the file as an Image
img = ImageIO.read(new File("image.jpg"));

// Get the raster data (array of pixels)
Raster src = img.getData();

// Create an identically-sized output raster
WritableRaster dest = src.createCompatibleWritableRaster();

// Loop through every PIX_SIZE pixels, in both x and y directions
for(int y = 0; y < src.getHeight(); y += PIX_SIZE) {
    for(int x = 0; x < src.getWidth(); x += PIX_SIZE) {

        // Copy the pixel
        double[] pixel = new double[3];
        pixel = src.getPixel(x, y, pixel);

        // "Paste" the pixel onto the surrounding PIX_SIZE by PIX_SIZE neighbors
        // Also make sure that our loop never goes outside the bounds of the image
        for(int yd = y; (yd < y + PIX_SIZE) && (yd < dest.getHeight()); yd++) {
            for(int xd = x; (xd < x + PIX_SIZE) && (xd < dest.getWidth()); xd++) {
                dest.setPixel(xd, yd, pixel);
            }
        }
    }
}

// Save the raster back to the Image
img.setData(dest);

// Write the new file
ImageIO.write(img, "jpg", new File("image-pixelated.jpg"));

编辑:我想我应该提一下 - double[] pixel就我所知,只是RGB颜色值.例如,当我倾倒单个像素时,它看起来像{204.0, 197.0, 189.0}浅棕褐色.