dennda

    uint16_t pix = 0;
    uint16_t min = 34464;
    uint16_t max = 0;
    uint16_t *d = (uint16_t*) imgData;
    for (int i = 0; i < 512 * 512; i++) {
        pix = d[i];
        if (pix > max)
            max = pix;
        else if (pix < min)
            min = pix;

dennda

    uint16_t pix;
    uint16_t min = 34464;
    uint16_t max = 0;
    uint16_t *d = (uint16_t*) imgData;
    for (int i = 0; i < 512 * 512; i++) {
        pix = d[i];
        if (pix > max)
            max = pix;
        else if (pix < min)
            min = pix;

dennda

    CGDataProviderRef provider = CGDataProviderCreateWithCFData((__bridge CFDataRef) data);
    CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceGray();
  
    CGImageRef img = CGImageCreate(width, height, bits_allocated, bits_allocated,
                                   width,// * (bits_allocated / 8),
                                   colorspace,
                                   kCGBitmapByteOrderDefault,
                                   provider, NULL, YES,
                                   kCGRenderingIntentDefault
                                   );

dennda

// In the interface:
@interface TransferFunction : NSObject {
     id <TransferFunctionDrawingDelegate> _delegate;
}
@property (nonatomic, weak) id <TransferFunctionDrawingDelegate> delegate;

// In the implementation:
@synthesize delegate=setDelegate;

- (void)setDelegate:(id <TransferFunctionDrawingDelegate>)delegate {

dennda

    uint16_t *remapped = (uint16_t*) malloc(width * height * sizeof(uint16_t));
    vImage_Buffer src = {imgData,
                         (vImagePixelCount) height,
                         (vImagePixelCount) width,
                         bytes_per_row
                        };
    vImage_Buffer dst = {remapped,
                         (vImagePixelCount) height,
                         (vImagePixelCount) width,
                         bytes_per_row

dennda

    NSMutableArray *histo = [NSMutableArray array];
    for (int i = 0; i < num_bins; i++)
        [histo insertObject:[NSNumber numberWithUnsignedLong:histogram[i]] atIndex:i];

dennda

            uint8 *fourchan = (uint8*) malloc(sizeof(uint8) * width * height * 4);
            short cur;
            short *subscript = (short*) imgData;
            for (int i = 0; i < width * height; i++) {
                cur = (subscript[i] + 1000) / (int) pow(2., sizeof(short)/2.);
                fourchan[i*4] = (uint8) cur;
            }

dennda

            uint8 *fourchan = (uint8*) malloc(sizeof(uint8) * width * height * 4);
            short cur;
            short *subscript = (short*) imgData;
            for (int i = 0; i < width * height; i++) {
                cur = subscript[i] + 1000;
                fourchan[i*4] = cur;
            }

dennda

// works:
return [TransferFunctionPoint pointWithX:x
                                       Y:intercol.w
                                   Color:[UIColor greenColor]];

// runtime error:
    return [TransferFunctionPoint pointWithX:x
                                           Y:intercol.w
                                       Color:[UIColor colorWithRed:1. green:1. blue:0. alpha:1.]];

dennda

+ (TransferFunctionPoint *)pointWithX:(double)_x Y:(double)_y Color:(UIColor*)_color {
    TransferFunctionPoint *p = [[[self class] alloc] init];
    p.x = _x;
    p.y = _y;
    p.color = _color;
    return p;
}