Rotating image not working - c++

Question

I'm trying to rotate an image using openFrameworks, but I have a problem. My rotated image is red instead of its original color.
void testApp::setup(){
image.loadImage("abe2.jpg");
rotatedImage.allocate(image.width, image.height, OF_IMAGE_COLOR);
imageCenterX = image.getWidth() / 2;
imageCenterY = image.getHeight() / 2;
w = image.getWidth();
h = image.getHeight();
int degrees = 180;
float radians = (degrees*(PI / 180));
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
int index = image.getPixelsRef().getPixelIndex(x, y);
int newX = (cos(radians) * (x - imageCenterX) - sin(radians) * (y - imageCenterY) + imageCenterX);
int newY = (sin(radians) * (x - imageCenterX) + cos(radians) * (y - imageCenterY) + imageCenterY);
int newIndex = rotatedImage.getPixelsRef().getPixelIndex(newX, newY);
rotatedImage.getPixelsRef()[newIndex] = image.getPixelsRef()[index];
}
}
rotatedImage.update();
}
void testApp::update(){
}
void testApp::draw(){
image.draw(0,0);
rotatedImage.draw(0,400);
}
Can someone tell me what I am doing wrong?

Answer 1

If your image has three color components (Red, Green, Blue), you need to transform all three of those. The following should do the trick:
rotatedImage.getPixelsRef()[newIndex] = image.getPixelsRef()[index];
rotatedImage.getPixelsRef()[newIndex+1] = image.getPixelsRef()[index+1];
rotatedImage.getPixelsRef()[newIndex+2] = image.getPixelsRef()[index+2];