아이폰어플개발정보2010. 10. 23. 03:40
[아이폰 앱 개발] save it as a file after downloading image

Download an Image and Save it as PNG or JPEG in iPhone SDK

Here is a quick example to save an image as JPEG or PNG. In this tutorial, I’m getting the image from the Internet then I’m saving it as JPEG and PNG.

Key points:

  • NSData to retrieve the image from the URL
  • NSDocumentDirectory to find Document folder’s Path
  • UIImagePNGRepresentation to save it as PNG
  • UIImageJPEGRepresentation to save it as JPEG

        NSLog(@"Downloading...");
        // Get an image from the URL below
        UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.objectgraph.com/images/og_logo.png"]]];
 
        NSLog(@"%f,%f",image.size.width,image.size.height);
 
        // Let's save the file into Document folder.
        // You can also change this to your desktop for testing. (e.g. /Users/kiichi/Desktop/)
        // NSString *deskTopDir = @"/Users/kiichi/Desktop";
 
        NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
 
        // If you go to the folder below, you will find those pictures
        NSLog(@"%@",docDir);
 
        NSLog(@"saving png");
        NSString *pngFilePath = [NSString stringWithFormat:@"%@/test.png",docDir];
        NSData *data1 = [NSData dataWithData:UIImagePNGRepresentation(image)];
        [data1 writeToFile:pngFilePath atomically:YES];
 
        NSLog(@"saving jpeg");
        NSString *jpegFilePath = [NSString stringWithFormat:@"%@/test.jpeg",docDir];
        NSData *data2 = [NSData dataWithData:UIImageJPEGRepresentation(image, 1.0f)];//1.0f = 100% quality
        [data2 writeToFile:jpegFilePath atomically:YES];
 
        NSLog(@"saving image done");
 
        [image release];

Download Sample XCode Project from here


http://blog.objectgraph.com/index.php/2010/04/05/download-an-image-and-save-it-as-png-or-jpeg-in-iphone-sdk/

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아이폰어플개발정보2010. 10. 12. 05:25
Convert an Image (UIImage) to Grayscale

http://iphonedevelopertips.com/

Convert an Image (UIImage) to Grayscale

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아이폰어플개발정보2010. 10. 5. 23:52
Convert an Image (UIImage) to Grayscale

http://iphonedevelopertips.com/

Convert an Image (UIImage) to Grayscale



출처 : http://blog.naver.com/PostList.nhn?blogId=philipousys¤tPage=45
Posted by 오늘마감

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