    // Copyright (C) 2011  Davis E. King (davis@dlib.net)
    // License: Boost Software License   See LICENSE.txt for the full license.
    #undef DLIB_RANDOMLY_COlOR_IMAGE_ABSTRACT_H__
    #ifdef DLIB_RANDOMLY_COlOR_IMAGE_ABSTRACT_H__

    #include "../hash.h"
    #include "../pixel.h"
    #include "../matrix.h"

    namespace dlib
    {

    // ----------------------------------------------------------------------------------------
    // ----------------------------------------------------------------------------------------

        template <
            typename image_type
            >
        const matrix_exp randomly_color_image (
            const image_type& img
        );
        /*!
            requires
                - image_type is an implementation of array2d/array2d_kernel_abstract.h
                - pixel_traits<image_type::type> must be defined
            ensures
                - randomly generates a mapping from gray level pixel values
                  to the RGB pixel space and then uses this mapping to create
                  a colored version of img.  Returns a matrix which represents
                  this colored version of img.
                - black pixels in img will remain black in the output image.
                - The returned matrix will have the same dimensions as img.
        !*/

    // ----------------------------------------------------------------------------------------
    // ----------------------------------------------------------------------------------------

        template <
            typename image_type
            >
        const matrix_exp heatmap (
            const image_type& img,
            double max_val,
            double min_val = 0
        );
        /*!
            requires
                - image_type is an implementation of array2d/array2d_kernel_abstract.h
                - pixel_traits<image_type::type> must be defined
            ensures
                - Interprets img as a grayscale image and returns a new matrix
                  which represents a colored version of img.  In particular, the
                  colors will depict img using a heatmap where pixels with a
                  value <= min_val are black and larger pixel values become
                  more red, then yellow, and then white as they approach max_val.
                - The returned matrix will have the same dimensions as img.
        !*/

    // ----------------------------------------------------------------------------------------

        template <
            typename image_type
            >
        const matrix_exp heatmap (
            const image_type& img
        );
        /*!
            requires
                - image_type is an implementation of array2d/array2d_kernel_abstract.h
                - pixel_traits<image_type::type> must be defined
            ensures
                - returns heatmap(img, max(mat(img)), min(mat(img)))
        !*/

    // ----------------------------------------------------------------------------------------
    // ----------------------------------------------------------------------------------------

        template <
            typename image_type
            >
        const matrix_exp jet (
            const image_type& img,
            double max_val,
            double min_val = 0
        );
        /*!
            requires
                - image_type is an implementation of array2d/array2d_kernel_abstract.h
                - pixel_traits<image_type::type> must be defined
            ensures
                - Interprets img as a grayscale image and returns a new matrix which represents
                  a colored version of img.  In particular, the colors will depict img using a
                  jet color scheme where pixels with a value <= min_val are dark blue and
                  larger pixel values become light blue, then yellow, and then finally red as
                  they approach max_Val.
                - The returned matrix will have the same dimensions as img.
        !*/

    // ----------------------------------------------------------------------------------------

        template <
            typename image_type
            >
        const matrix_exp jet (
            const image_type& img
        );
        /*!
            requires
                - image_type is an implementation of array2d/array2d_kernel_abstract.h
                - pixel_traits<image_type::type> must be defined
            ensures
                - returns jet(img, max(mat(img)), min(mat(img)))
        !*/

    // ----------------------------------------------------------------------------------------
    // ----------------------------------------------------------------------------------------

    }

    #endif // DLIB_RANDOMLY_COlOR_IMAGE_ABSTRACT_H__