通过AffineTransform旋转使保存的图像为空

Ok my problem is simple, after performing AffineTransform, my image is not saving properly (however it is drawn on JPanel properly!). It is really strange, so any hints are really appreciated...

好吧我的问题很简单,在执行AffineTransform后,我的图像没有正确保存(但是它正确地在JPanel上绘制!)。这真的很奇怪,所以任何提示都非常感激......

Take a look on code:

看看代码:

    public BufferedImage performRotation(BufferedImage bi){

    if (angle!=180){
        at.translate(0.5*bi.getHeight(), 0.5*bi.getWidth());
        if(clockwise){
            at.rotate(Math.toRadians(angle));
        }else{
            at.rotate(Math.toRadians(-angle));
        }            
        at.translate(-0.5*bi.getWidth(), -0.5*bi.getHeight());
    }
    else if(angle==180){
        at.translate(0.5*bi.getWidth(), 0.5*bi.getHeight());
        at.rotate(Math.toRadians(angle));
        at.translate(-0.5*bi.getWidth(), -0.5*bi.getHeight());
    }

    AffineTransformOp op = new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR);
    BufferedImage bi2 = op.filter(bi, null);

    try {                  
    ImageIO.write(bi, "bmp", new File("BEFORE filterORIG.bmp"));
    ImageIO.write(bi2, "bmp", new File("AFTER filterNEW.bmp"));
    } catch (IOException ex) {
        Logger.getLogger(DrawingField.class.getName()).log(Level.SEVERE, null, ex);
    }

File BEFORE filterORIG is saved properly -> there is an image, but its pre-rotated.

文件BEFORE FILORIG正确保存 - >有一个图像,但它已预先旋转。

File AFTER... is saved as blank file.

文件AFTER ...保存为空白文件。

What is really interesting, is previously mentioned fact that this transformation is poperly shown on JPanel that i use as a display (i can observe effect of desired transformation)

真正有趣的是,之前提到的事实是这个转换在JPanel上显示我用作显示器(我可以观察到所需转换的效果)

Any help appreciated...

任何帮助表示...

1 个解决方案

#1

Try writing png images, ie:

尝试编写png图像,即:

ImageIO.write(bi, "png", new File("BEFORE filterORIG.png"));
ImageIO.write(bi2, "png", new File("AFTER filterNEW.png"));

The resulting image (bi2) may have an aplha channel and ImageIO may not allow to encode images with aplha as bmp.

得到的图像(bi2)可能具有aplha通道,并且ImageIO可能不允许将具有aplha的图像编码为bmp。

Alternatively, create a destination image with TYPE_INT_RGB color model and use it as a second argument in filter() method.

或者,使用TYPE_INT_RGB颜色模型创建目标图像,并将其用作filter()方法中的第二个参数。

#1