Changing an image's colorspace

With ArcV, it is extremely easy to modify an image's colorspace. It just requires one function call, where the parameter mat is an image:

Arcv::Matrix<float> res = Arcv::Image::changeColorspace<ARCV_COLORSPACE_XXXXX>(mat);  // "mat" is an Arcv::Mat (or Arcv::Matrix<>)

The template ARCV_COLORSPACE_XXXXX is to be subsituted with any of the following values:

ARCV_COLORSPACE_GRAY        // Grayscale
ARCV_COLORSPACE_GRAY_ALPHA  // Grayscale with alpha channel
ARCV_COLORSPACE_RGB         // Red/Green/Blue, standard colorspace
ARCV_COLORSPACE_RGBA        // RGB with alpha channel
ARCV_COLORSPACE_HSV         // Hue/Saturation/Value, useful in case of color thresholding

And here goes! Just write your image to a file if you want to see the result:

Arcv::Image::write("output.png", res);

Original image (simple RGB colorspace):

Colorspace	Output image
ARCV_COLORSPACE_GRAY
ARCV_COLORSPACE_HSV

Note: HSV's output is not meant to be shown, this is why the result is nonsense.