将ciimage转换为可写格式

Question

I need to convert CIImage to a format which could be written to disk.

Currently I am using the following code to convert it to JPG format .

 NSBitmapImageRep* rep = [[[NSBitmapImageRep alloc] initWithCIImage:result] autorelease];

 NSData *JPEGData = [rep representationUsingType:NSJPEGFileType properties:nil];
[JPEGData writeToFile:targetPath atomically:YES]; 

But the real memory usage shoots up to above 100 MB . My application requires me to handle a large number of images so i need to optimise my memory usage.

Can anyone please suggest anything ???

Answer 1

If it's the cumulative memory that's an issue, and not just one image, you can try wrapping the two last lines in your own autorelease pool:

@autoreleasepool {
    NSData *JPEGData = [rep representationUsingType:NSJPEGFileType properties:nil];
    [JPEGData writeToFile:targetPath atomically:YES];
}