This package is made as the final project for CS50R course.

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imgarith

Overview

imgarith is an R package that provides tools for performing arithmetic operations on images. It extends the functionality of the magick package by allowing direct arithmetic operations between images and numeric values.

Features

• Arithmetic operations on images:

  • Addition (+): Combine images or increase pixel values
  • Subtraction (-): Difference between images or decrease pixel values
  • Multiplication (*): Scale pixel values
  • Division (/): Divide pixel values

• Image manipulation utilities:

  • image_adjust(): Modify pixel values in specific image regions
  • image_resize_all(): Resize multiple images to matching dimensions
  • image_scale(): Scale images by integer factors (ideal for pixel art)

Installation

You can install the development version of imgarith from GitHub:

# install.packages("devtools")
devtools::install_github("abrormaksudov/imgarith")

Usage

Basic Arithmetic

library(imgarith)
library(magick)

Create test images

img1 <- magick::image_blank(100, 100, "rgb(100,150,200)")
img2 <- magick::image_blank(100, 100, "rgb(200,100,50)")

Image-image operations

sum_img <- img1 + img2      # Add images
diff_img <- img1 - img2     # Subtract images
prod_img <- img1 * img2     # Multiply images
quot_img <- img1 / img2     # Divide images

Image-number operations

bright <- img1 + 50         # Increase brightness
dark <- img1 - 30           # Decrease brightness
double <- img1 * 2          # Double pixel values
half <- img1 / 2            # Halve pixel values

Image Manipulation

Adjust specific region

result <- image_adjust(img1, 1:50, 1:50, 100, channels = 1)  # Make upper left quarter more red

Scale image

scaled <- image_scale(img1, factor = 2, how = "both")  # Double size in both dimensions

Resize multiple images to match

resized <- image_resize_all(img1, img2, width = 800, height = 600)

Requirements

• magick

License

MIT License