After a full day of searching, I've found a few similar answers, but nothing that seems to work for me.
I've built an app to be used in OSX which fetches a list of images from a user inputted directory, runs each through a renaming process, converts to a JPG, and hopefully with your help, converts to RGB color.
NSImage *image = [[NSImage alloc] initWithContentsOfFile:from];
NSInteger imageWidth = image.size.width * 4.16666666667;
NSInteger imageHeight = image.size.height * 4.16666666667;
NSBitmapImageRep* theRGBImageRep = [[NSBitmapImageRep alloc]
initWithBitmapDataPlanes:NULL pixelsWide:imageWidth pixelsHigh:imageHeight
bitsPerSample: 8 samplesPerPixel: 4 hasAlpha: YES isPlanar: NO
colorSpaceName: NSCalibratedRGBColorSpace bytesPerRow: 0 bitsPerPixel: 0];
NSGraphicsContext* theContext = [NSGraphicsContext
graphicsContextWithBitmapImageRep: theRGBImageRep];
NSImageRep* theImageRep = [image bestRepresentationForRect:
NSMakeRect(0.0, 0.0, imageWidth, imageHeight) context:theContext
hints:[NSDictionary dictionaryWithObject:NSDeviceRGBColorSpace
forKey:NSDeviceColorSpaceName]];
[NSGraphicsContext saveGraphicsState];
[NSGraphicsContext setCurrentContext: theContext];
NSRect theBoundsRect = NSMakeRect(0.0, 0.0, [theRGBImageRep pixelsWide],
[theRGBImageRep pixelsHigh]);
[[NSColor clearColor] set];
NSRectFill(theBoundsRect);
[theImageRep drawInRect: theBoundsRect];
[NSGraphicsContext restoreGraphicsState];;
[image addRepresentation: theRGBImageRep];
NSDictionary *imageProps = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithFloat:1.0],NSImageCompressionFactor, nil];
NSData *bitmapData = [theRGBImageRep representationUsingType:NSJPEGFileType
properties:imageProps];
if ([bitmapData writeToFile:toJPG atomically:YES] == YES){
feedback = [NSString stringWithFormat:@"%@ -> %@\n", string, jpgFileName];
[readOut insertText:feedback];
[readOut display];
} else {
feedback = [NSString stringWithFormat:@"%@ - FAILED\n", string];
[errorLog insertText:feedback];
[errorLog display];
}
It the image is output correctly as a JPEG, in the designated folder, but always remains CMYK. Anyone else run into this?
EDITED TO SHOW WASHED OUT RESULTS:
UPDATED CODE (this is what is currently giving washed out results)
try this
NSImageRep* theImageRep = [inputImage bestRepresentationForDevice:
[NSDictionary dictionaryWithObject: NSDeviceRGBColorSpace
forKey: NSDeviceColorSpaceName]];
NSString* theColorSpace = [theImageRep colorSpaceName];
if ([theColorSpace isEqualToString: NSDeviceCMYKColorSpace])
{
NSBitmapImageRep* theRGBImageRep = [[[NSBitmapImageRep alloc]
initWithBitmapDataPlanes: NULL
pixelsWide: [theImageRep pixelsWide]
pixelsHigh: [theImageRep pixelsHigh]
bitsPerSample: 8
samplesPerPixel: 4
hasAlpha: YES
isPlanar: NO
colorSpaceName: NSDeviceRGBColorSpace
bytesPerRow: 0
bitsPerPixel: 0] autorelease];
NSGraphicsContext* theContext = [NSGraphicsContext
graphicsContextWithBitmapImageRep: theRGBImageRep];
[NSGraphicsContext saveGraphicsState];
[NSGraphicsContext setCurrentContext: theContext];
NSRect theBoundsRect = NSMakeRect(0.0, 0.0, [theRGBImageRep pixelsWide],
[theRGBImageRep pixelsHigh]);
[[NSColor clearColor] set];
NSRectFill(theBoundsRect);
[theImageRep drawInRect: theBoundsRect];
[NSGraphicsContext restoreGraphicsState];
ASSIGNOBJECT(rgbImage, [[[NSImage alloc] initWithSize: [theImageRepsize]] autorelease]);
[rgbImage addRepresentation: theRGBImageRep];
}
else
{
ASSIGNOBJECT(rgbImage, inputImage);
}