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NSImage *resizedImage = [[NSImage alloc] initWithSize: theNewSize];

// lock focus on resized image
[resizedImage lockFocus];

[NSGraphicsContext saveGraphicsState];

// set image interpolation -> high (better resize quality)
[[NSGraphicsContext currentContext] setImageInterpolation:NSImageInterpolationHigh];

// src draw to resized
[image drawInRect:NSMakeRect(0.0,0.0,theNewSize.width, theNewSize.height)
fromRect:NSMakeRect(0.0,0.0,[image size].width, [image size].height)
operation:NSCompositeCopy fraction:1.0];

[NSGraphicsContext restoreGraphicsState];

[resizedImage unlockFocus];