#' @details \emph{The main functions are:}
#' \itemize{
#' \item \code{\link[imagefluency]{img_contrast}} to get the visual contrast of an
#' image
#' \item \code{\link[imagefluency]{img_complexity}} to get the visual complexity of
#' an image (equals 1 minus image simplicity)
#' \item \code{\link[imagefluency]{img_self_similarity}} to get the visual
#' self-similarity of an image
#' \item \code{\link[imagefluency]{img_simplicity}} to get the visual simplicity
#' of an image (equals 1 minus image complexity)
#' \item \code{\link[imagefluency]{img_symmetry}} to get the vertical and
#' horizontal symmetry of an image
#' \item \code{\link[imagefluency]{img_typicality}} to get the visual typicality
#' of a list of images relative to each other
#' }
#' \emph{Other helpful functions are:}
#' \itemize{
#' \item \code{\link[imagefluency]{img_read}} wrapper function
#' to read images using \code{\link[readbitmap:read.bitmap]{readbitmap::read.bitmap}}
#' \item \code{\link[imagefluency]{run_imagefluency}} to launch a Shiny app
#' for an interactive demo of the main functions
#' \item \code{\link[imagefluency]{rgb2gray}} to convert images from
#' RGB into grayscale
#' }
#'
#'
#' @references Mayer, S. & Landwehr, J, R. (2018). Quantifying Visual Aesthetics
#' Based on Processing Fluency Theory: Four Algorithmic Measures for
#' Antecedents of Aesthetic Preferences. \emph{Psychology of Aesthetics,
#' Creativity, and the Arts}, \emph{12}(4), 399--431.
#' \doi{10.1037/aca0000187}
#'
#' @references Mayer, S. & Landwehr, J. R. (2018). Objective measures of design
#' typicality. \emph{Design Studies}, \emph{54}, 146--161.
#' \doi{10.31219/osf.io/gtbhw}
#'
#' @keywords internal
"_PACKAGE"
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