var provider = CGImageGetDataProvider(imageArray[imageNumber]?.CGImage) //Get data provider for image in an array at index No. imageNumber
    let data = CGDataProviderCopyData(provider)
    var buffer = [Byte](count: CFDataGetLength(data), repeatedValue: 0) //create buffer for image data
    CFDataGetBytes(data, CFRangeMake(0, CFDataGetLength(data)), &buffer) //load the image's bytes into buffer
    var newBuffer = [Byte](count:buffer.count, repeatedValue: 0) //Going to make some changes, need a place to save new image
    var index = 0
    for aByte in buffer {
        if aByte > 0xa && aByte != 0xff {
       newBuffer[index] = (aByte - 0xa) //subtract 0xa from buffer, where possible
        }
        else{
            newBuffer[index] = (0xff) //I *think* there is no alpha channel, but every fourth byte in buffer is 0xff
        }
        index += 1
    }
    var coreGraphicsImage = CGImageCreateWithJPEGDataProvider(CGDataProviderCreateWithCFData( CFDataCreate(kCFAllocatorDefault, newBuffer, newBuffer.count)), nil, true, kCGRenderingIntentDefault) //create CGimage from newBuffer.RETURNS NIL!
    let myImage = UIImage(CGImage: coreGraphicsImage) //also nil
    imageView.image = myImage