使用iPhone相机拍摄的图像的设置类型

Question

如果我们使用iPhone相机拍摄图片，图像将默认保存为JPEG格式。

我想保存以PNG等其他格式捕获的图像。可能吗？

当我们从我们的应用程序调用iPhone摄像头时，是否可以从代码执行此操作，我们可以设置捕获图片后必须保存的图片类型吗？我的意思是在拍摄照片之前打开相机并设置类型？

Answer 1

这将帮助你保存图像为PNG键入

-(void)imagePickerController:(UIImagePickerController *)picker 
    didFinishPickingImage : (UIImage *)image 
      editingInfo:(NSDictionary *)editingInfo 
{ 
NSError *error; 

NSString *pngPath = [NSHomeDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"Documents/%@.png",@"photoname"]]; 
[UIImagePNGRepresentation(image) writeToFile:pngPath atomically:NO]; 


NSString *documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; 

NSLog(@"Documents directory: %@", [fileManager contentsOfDirectoryAtPath:documentsDirectory error:&error]); 

[self dismissModalViewControllerAnimated:YES]; 
} 

Answer 2

您可以使用类似这样的东西在你的方法到拍摄对象保存为PNG：

// Create paths to output images 
NSString *thePngPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Example.png"]; 
NSString *theJpgPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Example.jpg"]; 

// Write a UIImage to JPEG with minimum compression (best quality) 
// The value 'image' must be a UIImage object 
// The value '1.0' represents image compression quality as value from 0.0 to 1.0 
[UIImageJPEGRepresentation(image, 1.0) writeToFile:theJpgPath atomically:YES]; 

// Write image to PNG 
[UIImagePNGRepresentation(image) writeToFile:thePngPath atomically:YES]; 

Answer 3

使用此代码，

NSData* pngdata = UIImagePNGRepresentation (image); //PNG wrap 
UIImage* img = [UIImage imageWithData:pngdata]; 
UIImageWriteToSavedPhotosAlbum(img, nil, nil, nil); 

Answer 4

UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage]; 

// png image data 

NSData *pngData = UIImagePNGRepresentation(image); 

// jpeg image data 

NSData *jpegData = UIImageJPEGRepresentation(image, compressionQuality); // compressionQuality = 0.0 to 1.0 --> 0 means maximum compression and 1 means minimum compression 

一旦你获得NSData，你可以将这些数据保存到特定的文件。欲了解更多详情，请通过此link

希望这会帮助你。