tweak: tweak: Quick image modification.

In moodymudskipper/tweak: Modifies PNG images

Description

tweak: Quick image modification.

Recolor, add transparency, cut an image into two parts etc

Usage

tweak(img, color = NA, bold = NA, alpha = NA, cuts = NULL, dir = "v")

Arguments

img	pth, url, array or raster of image to transform, supports tif jpg and png
color	the color to convert to, only R colors, original colors kept if NULL
bold	set all color values to chosen color, leaves alpha untouched (0 to 1)
alpha	to add more transparency (0 to 1)
cuts	vector of relative positions of cuts (0 to 1)
dir	direction of separation

Details

Originally designed to help build infographics in R.

Examples

img <- system.file("img", "Rlogo.png", package="png")
imgs <- list(
  tweak(img),            # original
  tweak(img,alpha=0.5),  # transparent
  tweak(img,"black"),    # greyscales
  tweak(img,"darkred"),    # any R color
  tweak(img,cuts=c(0.7),alpha = c(0,NA)),          # clean cut
  tweak(img,cuts=c(0.7),alpha = c(0.5,NA)),        #   transparency
  tweak(img,cut=c(0.33,0.66), dir = "h",
    color=c("black","gold","darkred")),      #   color on both side
  tweak(img,"darkred",bold = 1),            # make completely bold
  tweak(img,"darkred",bold = 0.3)          # make partially bold
)
showcase(imgs)

moodymudskipper/tweak documentation built on May 20, 2019, 8:49 a.m.