How can I save a NSImage as a new file (png, jpg, ...) in a certain directory?
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.