countcolors (version 0.9.1)

changePixelColor: Change all specified pixels to a new color

Description

Changes pixels in an image to a different color and displays and/or returns the re-colored image.

Usage

changePixelColor(pixel.array, pixel.idx, target.color = "green",
  return.img = FALSE, plotting = TRUE, main = "")

Arguments

pixel.array

An image represented as a 3D array (as read in by readJPEG, readPNG, or loadImage) in which to change pixel colors.

pixel.idx

An n x 2 matrix of index coordinates specifying which pixels to change, where rows are pixels and columns are X and Y coordinates in the image.

target.color

Color with which to replace specified pixels. Can be either a an RGB triplet or one of the colors listed by colors.

return.img

Logical. Should RGB array with swapped colors be returned?

plotting

Logical. Should output be plotted in the plot window?

main

Optional title to display for image.

Value

Raster array with indicated pixels changed to target color, if return.img = TRUE.

Examples

# NOT RUN {
# Change a rectangle in the center to black
flowers <- jpeg::readJPEG(system.file("extdata", "flowers.jpg", package =
"countcolors"))

sinister.object <- expand.grid(c(114:314), c(170:470))

countcolors::changePixelColor(flowers, sinister.object, target.color = "black")

# }
# NOT RUN {
# Change all the white flowers to magenta
indicator.img <- countcolors::sphericalRange(flowers, center = c(1, 1, 1),
radius = 0.1, color.pixels = TRUE, plotting = FALSE)

countcolors::changePixelColor(flowers, indicator.img$pixel.idx,
target.color="magenta")
# }