Untitled22

library(magick)

## Warning: package 'magick' was built under R version 4.2.2

## Linking to ImageMagick 6.9.12.3
## Enabled features: cairo, freetype, fftw, ghostscript, heic, lcms, pango, raw, rsvg, webp
## Disabled features: fontconfig, x11

library(magick)
str(magick::magick_config())

## List of 24
##  $ version           :Class 'numeric_version'  hidden list of 1
##   ..$ : int [1:4] 6 9 12 3
##  $ modules           : logi FALSE
##  $ cairo             : logi TRUE
##  $ fontconfig        : logi FALSE
##  $ freetype          : logi TRUE
##  $ fftw              : logi TRUE
##  $ ghostscript       : logi TRUE
##  $ heic              : logi TRUE
##  $ jpeg              : logi TRUE
##  $ lcms              : logi TRUE
##  $ libopenjp2        : logi TRUE
##  $ lzma              : logi TRUE
##  $ pangocairo        : logi TRUE
##  $ pango             : logi TRUE
##  $ png               : logi TRUE
##  $ raw               : logi TRUE
##  $ rsvg              : logi TRUE
##  $ tiff              : logi TRUE
##  $ webp              : logi TRUE
##  $ wmf               : logi FALSE
##  $ x11               : logi FALSE
##  $ xml               : logi TRUE
##  $ zero-configuration: logi TRUE
##  $ threads           : int 1

Membangun dari sumber

library(magick)
tiger <- image_read_svg('http://jeroen.github.io/images/tiger.svg', width = 350)
print(tiger)

##   format width height colorspace matte filesize density
## 1    PNG   350    350       sRGB  TRUE        0   72x72

frink <- image_read("https://jeroen.github.io/images/frink.png")
print(frink)

##   format width height colorspace matte filesize density
## 1    PNG   220    445       sRGB  TRUE    73494   72x72

image_border(image_background(frink, "hotpink"), "#000080", "20x10")

image_trim(frink)

image_crop(frink, "100x150+50")

image_charcoal(frink)

image_negate(frink)

image_rotate(frink, 45)

image_flip(frink)

image_flop(frink)

image_modulate(frink, brightness = 80, saturation = 120, hue = 90)

konvolusi kernel
Fungsi image_convolve() menerapkan kernel di atas gambar. Konvolusi kernel berarti bahwa setiap nilai piksel dihitung ulang menggunakan jumlah lingkungan berbobot yang ditentukan dalam matriks kernel. Sebagai contoh mari kita lihat kernel sederhana ini:

kern <- matrix(0, ncol = 3, nrow = 3)
kern[1, 2] <- 0.25
kern[2, c(1, 3)] <- 0.25
kern[3, 2] <- 0.25
kern

##      [,1] [,2] [,3]
## [1,] 0.00 0.25 0.00
## [2,] 0.25 0.00 0.25
## [3,] 0.00 0.25 0.00

img <- image_resize(logo, "300x300")
img_blurred <- image_convolve(img, kern)
image_append(c(img, img_blurred))

img %>% image_convolve('Sobel') %>% image_negate()

img %>% image_convolve('DoG:0,0,2') %>% image_negate()

Anotasi teks

image_annotate(frink, "I like R!", size = 70, gravity = "southwest", color = "green")

image_annotate(frink, "CONFIDENTIAL", size = 30, color = "red", boxcolor = "pink",
  degrees = 60, location = "+50+100")

Menggabungkan dengan pipa

frink <- image_read("https://jeroen.github.io/images/frink.png")
frink2 <- image_scale(frink, "100")
image_info(frink)

##   format width height colorspace matte filesize density
## 1    PNG   220    445       sRGB  TRUE    73494   72x72

test <- image_rotate(frink, 90)
test <- image_background(test, "blue", flatten = TRUE)
test <- image_border(test, "red", "10x10")
test <- image_annotate(test, "This is how we combine transformations", color = "white", size = 30)
print(test)

##   format width height colorspace matte filesize density
## 1    PNG   465    240       sRGB  TRUE        0   72x72

Vektor Gambar

earth <- image_read("https://jeroen.github.io/images/earth.gif") %>%
  image_scale("200x") %>%
  image_quantize(128)

length(earth)

## [1] 44

earth

Lapisan

bigdata <- image_read('https://jeroen.github.io/images/bigdata.jpg')
frink <- image_read("https://jeroen.github.io/images/frink.png")
logo <- image_read("https://jeroen.github.io/images/Rlogo.png")
img <- c(bigdata, logo, frink)
img <- image_scale(img, "300x300")
image_info(img)

##   format width height colorspace matte filesize density
## 1   JPEG   300    225       sRGB FALSE        0   72x72
## 2    PNG   300    232       sRGB  TRUE        0   72x72
## 3    PNG   148    300       sRGB  TRUE        0   72x72

image_mosaic(img)

image_flatten(img, 'Add')

image_append(image_scale(img, "x200"))

bigdatafrink <- image_scale(image_rotate(image_background(frink, "none"), 300), "x200")
image_composite(image_scale(bigdata, "x400"), bigdatafrink, offset = "+180+100")