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Question

Answer 1

+3 A:

Do something like this:

NSBitmapImageRep *imgRep = [[image representations] objectAtIndex: 0];
NSData *data = [imgRep representationUsingType: NSPNGFileType properties: nil];
[data writeToFile: @"/path/to/file.png" atomically: NO];

garph0 2010-06-14 16:18:43

You should get the bitmap image rep in a more reliable way than assuming that it is the first representation. You also cannot assume that there is one; if the image was loaded from a PDF, for example, then there will be an NSPDFImageRep, not an NSBitmapImageRep.

Peter Hosey 2010-06-15 02:09:10

This is buggy hack. See below for regular answer.

Eonil 2010-09-12 08:24:29

Answer 2

+2 A:

You could add a category to NSImage like this

@interface NSImage(saveAsJpegWithName)
- (void) saveAsJpegWithName:(NSString*) fileName;
@end

@implementation NSImage(saveAsJpegWithName)

- (void) saveAsJpegWithName:(NSString*) fileName
{
    // Cache the reduced image
    NSData *imageData = [self TIFFRepresentation];
    NSBitmapImageRep *imageRep = [NSBitmapImageRep imageRepWithData:imageData];
    NSDictionary *imageProps = [NSDictionary dictionaryWithObject:[NSNumber numberWithFloat:1.0] forKey:NSImageCompressionFactor];
    imageData = [imageRep representationUsingType:NSJPEGFileType properties:imageProps];
    [imageData writeToFile:fileName atomically:NO];        
}

@end

The call to "TIFFRepresentation" is essential otherwise you may not get a valid image.

Pegolon 2010-07-09 13:29:23

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How to save a NSImage as a new file

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