rayimage (version 0.26.1)

render_resized: Resize Image

Description

Resizes an image or a matrix, using bilinear interpolation.

Usage

render_resized(
  image,
  mag = 1,
  dims = NULL,
  filename = NULL,
  preview = FALSE,
  method = "tri"
)

Value

A rayimg RGBA array.

Arguments

image

3-layer RGB/4-layer RGBA array, rayimg class, or filename of an image.

mag

Default 1. Amount to magnify the image, preserving aspect ratio. Overridden if dim is not NULL.

dims

Default NULL. Exact resized dimensions.

filename

Default NULL. The filename of the image to be saved. If this is not given, the image will be plotted instead.

preview

Default FALSE. Whether to plot the convolved image, or just to return the values.

method

Default trilinear. Filters to up/downsample the image. Options: bilinear, box, trilinear, catmull, mitchell.

Examples

if (FALSE) { # interactive() || identical(Sys.getenv("IN_PKGDOWN"), "true")
#Plot the image with a title
dragon |>
 render_title("Dragon", title_offset=c(10,10), title_bar_color="black",
           title_size=20, title_color = "white") |>
 plot_image()
#Half of the resolution
render_resized(dragon, mag = 1/2) |>
 render_title("Dragon (half res)", title_offset=c(5,5), title_bar_color="black",
           title_size=10, title_color = "white") |>
 plot_image()
#Double the resolution
render_resized(dragon, mag = 2) |>
 render_title("Dragon (2x res)", title_offset=c(20,20), title_bar_color="black",
           title_size=40, title_color = "white") |>
 plot_image()
#Specify the exact resulting dimensions
render_resized(dragon, dim = c(160,320)) |>
 render_title("Dragon (custom size)", title_offset=c(10,10), title_bar_color="black",
           title_size=20, title_color = "white") |>
 plot_image()
}