java - 我怎样才能用java像素化jpg？

Question

我正在尝试使用 Java 6 对 JPEG 像素化，但运气不佳。它需要与 Java 一起使用 - 而不是像 Photoshop 这样的图像处理程序，并且它需要看起来很老派 - 就像这样:

谁能帮帮我？

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执行自己像素化。

示例代码如下。您至少需要这些导入:javax.imageio.ImageIO、java.awt.image.BufferedImage、java.awt.image.Raster 、java.awt.image.WritableRaster 和 java.io.File。

例子:

// 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"));

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编辑:我想我应该提一下——据我所知，double[] 像素 只是 RGB 颜色值。例如，当我转储单个像素时，它看起来像 {204.0, 197.0, 189.0}，浅棕褐色。