CocoaCreateBlankImage.m

- (NSImage *)blankImageOfSize:(NSSize)size;
{
	NSBitmapImageRep *rep=[[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL
																  pixelsWide:size.width
																  pixelsHigh:size.height
															   bitsPerSample:8
															 samplesPerPixel:4
																	hasAlpha:YES
																	isPlanar:NO
															  colorSpaceName:NSDeviceRGBColorSpace
																 bytesPerRow:0
																bitsPerPixel:0];
	
	// blank the image
	unsigned char *data=[rep bitmapData];
	NSUInteger count=[rep bytesPerPlane];
	memset(data, 0, count);
	
	NSImage *img=[[NSImage alloc] initWithSize:size];	
	[img addRepresentation:rep];
	return img;
}