如何在android中将图像格式从JPEG更改为PNG？

发布于 2024-12-21 05:58:54 字数 838 浏览 0 评论 0原文

我通过传递意图来打开默认的 Android 设备摄像头。因此，当捕获图像时，相机默认以 JPEG 格式存储它。但我不想以有损格式存储它们。我想要高画质。那么我如何将它存储为 PNG 格式？...

这是我打开相机的代码：

Date dt = new Date();     
        int date=dt.getDate();  
        int hours = dt.getHours();     
        int minutes = dt.getMinutes();   
        int seconds = dt.getSeconds();     
        String curTime = date+"_"+hours + "_"+minutes + "_"+ seconds;  
         _path=Environment.getExternalStorageDirectory() +"/"+curTime+".jpg";  
        File file = new File( _path );  
        Uri outputFileUri = Uri.fromFile( file );  
        Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );  
    intent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri );  

 context.startActivityForResult(intent,0);

然后处理 onActivutyForResult (){....}

谢谢斯内哈

原文

I am opening the default android device camera by passing an intent. So when an image is captured, by default, camera stores it in JPEG format. But I don't want to store them in lossy format. I want picture quality to be high. So how can i store it in PNG format?...

here goes my code to open camera :

Date dt = new Date();     
        int date=dt.getDate();  
        int hours = dt.getHours();     
        int minutes = dt.getMinutes();   
        int seconds = dt.getSeconds();     
        String curTime = date+"_"+hours + "_"+minutes + "_"+ seconds;  
         _path=Environment.getExternalStorageDirectory() +"/"+curTime+".jpg";  
        File file = new File( _path );  
        Uri outputFileUri = Uri.fromFile( file );  
        Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );  
    intent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri );  

 context.startActivityForResult(intent,0);

Then handle onActivutyForResult (){....}

Thanks
Sneha

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明月松间行 2024-12-28 05:58:54

我还没有找到任何方法可以让相机将文件保存为 PNG。

但是您可以将 JPEG 图像转换为 PNG 格式。

try {
       FileOutputStream out = new FileOutputStream(filename);
       bmp.compress(Bitmap.CompressFormat.PNG, 100, out); //100-best quality
       out.close();
} catch (Exception e) {
       e.printStackTrace();
}

请注意，这不会提高质量。您无法“增加”图像中的信息。这只会改变图像格式。

I haven't come across any method to make the camera save the file as PNG.

But you could convert the JPEG Image into PNG format.

try {
       FileOutputStream out = new FileOutputStream(filename);
       bmp.compress(Bitmap.CompressFormat.PNG, 100, out); //100-best quality
       out.close();
} catch (Exception e) {
       e.printStackTrace();
}

Note, this won't enhance the quality. You cannot "increase" the information in an image. This will only change the Image Format.

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