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tinyimg

An R package for optimizing and compressing images using Rust libraries. Currently supports PNG optimization via exoquant (lossy palette reduction) and oxipng (lossless optimization).

Installation

You can install the development version of {tinyimg} from r-universe.dev:

install.packages("tinyimg", repos = "https://yihui.r-universe.dev")

Usage

Basic PNG optimization

library(tinyimg)

# Create a test PNG
tmp = tempfile()
png(tmp, width = 400, height = 400)
plot(1:10)
dev.off()

# Optimize with different levels (lossless)
tinypng(tmp, paste0(tmp, "-o1.png"), level = 1)
tinypng(tmp, paste0(tmp, "-o6.png"), level = 6)
# Lossy
tinypng(tmp, paste0(tmp, "-lossy.png"), lossy = 2.3)

Directory optimization

# Optimize all PNGs in a directory
tinypng("path/to/directory")

Optimization levels

The level parameter controls the optimization level (0-6):

• 0: Fast optimization with minimal compression
• 2: Default - good balance between speed and compression
• 6: Maximum optimization - best compression but slower

See the benchmark results for detailed comparisons of optimization levels and ?tinypng for full documentation.

For Package Developers

When installing from GitHub via remotes::install_github("yihui/tinyimg"), the package will automatically create the vendor directory if Rust is installed on your system.

If you’re developing and need to manually create the vendor directory:

# Run the update script to create vendor/ directory
./src/rust/update-vendor.sh

This creates the local vendor/ directory needed for development. Neither vendor/ nor vendor.tar.xz are tracked in git.

License

MIT License. See LICENSE file for details.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.