如何调整从iPhone相机拍摄的图片大小以降低分辨率？

Question

如何调整从iPhone相机拍摄的图片大小以降低分辨率？我想从iPhone相机拍摄照片，并在我的应用程序中将其保存为较低的分辨率。(为了节省空间)或者可以像发送图片的电子邮件一样显示图片大小的选项？

Answer 1

您可以使用compressionQuality值来压缩您的图像。

-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info
{
    //Imagedata = UIImageJPEGRepresentation(<#UIImage *image#>, <#CGFloat compressionQuality#>);

    Imagedata = UIImageJPEGRepresentation([info objectForKey:@"UIImagePickerControllerOriginalImage"],0);
}  

你可以通过name来设置大小

    NSLog(@"Video size >> %d",(videodta.length/1024)/1024);
    [picker addAttachmentData:videodta mimeType:@"video/mp4" fileName:[NSString stringWithFormat:@"My Data (size = %d MB)",(videodta.length/1024)/1024 ]];

Answer 2

试试这个：

-(UIImage *)imageWithImage:(UIImage *)imageToCompress scaledToSize:(CGSize)newSize {

    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [imageToCompress drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}