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我编写了这些函数，并结合使用这些函数来缩小一些 BitmapData 并将其保存为 PNG。但是，scaledImage.draw(originalImage, scalingMatrix, null, null, null, true);当我使用第二个函数将位图数据保存为 PNG 时，平滑设置为 true 的线没有预期的平滑效果。生成的图像文件根本没有抗锯齿。我在这里做错了什么吗？谢谢！

    public static function scaleImage(originalImage:BitmapData, size:int):BitmapData
    {
        // Calculate the scaled size.
        var scale:Number;
        var scaledWidth:Number;
        var scaledHeight:Number;

        if (originalImage.width > originalImage.height)
        {
            scale = (size as Number) / (originalImage.width as Number);
            scaledWidth = size;
            scaledHeight = originalImage.height * scale;
        }
        else
        {
            scale = (size as Number) / (originalImage.height as Number);
            scaledHeight = size;
            scaledWidth = originalImage.width * scale;
        }

        var scalingMatrix:Matrix = new Matrix();
        scalingMatrix.scale(scale, scale);

        // Scale the image.
        var scaledImage:BitmapData = new BitmapData(scaledWidth, scaledHeight, true, 0x00000000);
        scaledImage.draw(originalImage, scalingMatrix, null, null, null, true);

        return scaledImage;
    }

    public static function saveImageAsPNG(image:BitmapData, imageFile:File):void
    {
        // Encode the image as a PNG.
        var pngEncoder:PNGEncoder = new PNGEncoder();
        var imageByteArray:ByteArray = pngEncoder.encode(image);

        // Write the image data to a file.
        var imageFileStream:FileStream = new FileStream();
        imageFileStream.open(imageFile, FileMode.WRITE);
        imageFileStream.writeBytes(imageByteArray);
        imageFileStream.close();                
    }
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1 回答 1

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原来这段代码是有效的。它正在保存平滑的图像。这并不明显，因为我缩小的图像约为 20K x 20K 像素，所以锯齿无论如何都会出现平滑。对于 2K x 2K 像素等更“正常”大小的图像，平滑效果很明显

于 2010-12-27T21:34:50.553 回答