https://github.com/doehm/cropcircles
Crops an image to a circle in R
https://github.com/doehm/cropcircles
Last synced: 3 months ago
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Crops an image to a circle in R
- Host: GitHub
- URL: https://github.com/doehm/cropcircles
- Owner: doehm
- License: other
- Created: 2022-09-10T07:57:40.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2023-12-01T07:45:01.000Z (about 1 year ago)
- Last Synced: 2024-11-24T04:37:15.609Z (3 months ago)
- Language: R
- Homepage:
- Size: 6.56 MB
- Stars: 42
- Watchers: 2
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.Rmd
- License: LICENSE
Awesome Lists containing this project
- jimsghstars - doehm/cropcircles - Crops an image to a circle in R (R)
README
---
output: github_document
---
```{r, echo=FALSE}
library(cropcircles)
```
# cropcircles 
Crop an image into a circle with a transparent background.
The purpose of this package is to provide a simple and straight forward way to circle crop an image, with a transparent background and plot it with `ggimage`, `ggpath`, or include in tables using e.g. `gt`, `reactable`, etc. There are a few ways to do this, but this package intends to make it as simplified as possible.
## Release notes
Version 0.2.4 has changed the function naming convention to `crop_*`. `circle_crop` and `hex_crop` are still available and work the same way so won't break existing code but will be deprecated at some stage.
## Installation
From CRAN
```{r, eval = FALSE}
install.packages("cropcircles")
```
Or Git
```{r, eval = FALSE}
devtools::install_github("doehm/cropcircles")
```
## Usage
The main function `crop_circle` takes a vector of image paths, either local or URL links, crops the image and returns the path. The path of the cropped images can be provided or if left blank it will save them to a temp location which is cleared when the session ends.
A border can be added by specifying the size (in pixels) and colour.
```{r, echo=TRUE, eval=TRUE}
library(cropcircles)
library(magick)
img_path <- file.path(system.file(package = "cropcircles"), "images", "walter-jesse.png")
# saves to a temporary path
img_cropped <- crop_circle(img_path, border_size = 4)
# plot image with magic
# can be used with ggimage or ggpath
image_read(img_cropped)
# other geometries
image_read(crop_hex(img_path, border_size = 4))
image_read(crop_heart(img_path, border_size = 4))
```
The function can take an image with any dimensions. It will circle crop the image from the center with a diameter of the smallest dimension.
## Justify
With rectangular images the subject for focus may not be centered. The `crop_*` functions include a `just` argument which can take values `left`, `right`, `top` and `bottom`. It simply shifts the initial cropping window to the desired side.
```{r}
library(magick)
# justification example
img_path <- file.path(system.file(package = "cropcircles"), "images", "walter-jesse.png")
orig <- image_read(img_path)
# center (default)
center <- image_read(crop_circle(img_path, border_size = 4))
# left
left <- image_read(crop_circle(img_path, border_size = 4, just = "left"))
# right
right <- image_read(crop_circle(img_path, border_size = 4, just = "right"))
image_montage(c(orig, center, left, right))
```