| Type: | Package |
| Title: | A New Format for Lossless and Lossy Image Compression |
| Version: | 1.3.0 |
| Description: | Lossless webp images are 26% smaller in size compared to PNG. Lossy webp images are 25-34% smaller in size compared to JPEG. This package reads and writes webp images into a 3 (rgb) or 4 (rgba) channel bitmap array using conventions from the 'jpeg' and 'png' packages. |
| License: | MIT + file LICENSE |
| URL: | https://jeroen.r-universe.dev/webp |
| BugReports: | https://github.com/jeroen/webp/issues |
| SystemRequirements: | libwebp |
| Encoding: | UTF-8 |
| Suggests: | jpeg, png |
| RoxygenNote: | 7.1.1 |
| Language: | en-GB |
| NeedsCompilation: | yes |
| Packaged: | 2024-12-16 14:17:03 UTC; jeroen |
| Author: | Jeroen Ooms  [aut,
cre] |
| Maintainer: | Jeroen Ooms <jeroenooms@gmail.com> |
| Repository: | CRAN |
| Date/Publication: | 2024-12-16 15:10:02 UTC |
Webp image format
Description
Read and write webp images into a bitmap array. The bitmap array uses the same
conventions as the png and jpeg package.
Usage
read_webp(source, numeric = TRUE)
write_webp(image, target = NULL, quality = 80)
Arguments
source |
raw vector or path to webp file |
numeric |
convert the image to 0-1 real numbers to be compatible with images from the jpeg or png package. |
image |
array of 3 dimensions (width * height * channel) with real numbers between 0 and 1. |
target |
path to a file or |
quality |
value between 0 and 100 for lossy compression, or |
Examples
# Convert to webp
library(png)
img <- readPNG(system.file("img", "Rlogo.png", package="png"))
out <- file.path(tempdir(), "rlogo.webp")
write_webp(img, out)
# browseURL(out)
# Convert from webp
library(jpeg)
img <- read_webp(out)
jpeg <- file.path(tempdir(), "rlogo.jpeg")
writeJPEG(img, jpeg)
# browseURL(jpeg)