image_ggplot function

Image to ggplot

Create a ggplot with axes set to pixel coordinates and plot the raster image on it using ggplot2::annotation_raster . See examples for how to plot an image onto an existing ggplot.

image_ggplot(image, interpolate = FALSE)

Arguments

• image: magick image object returned by image_read() or image_graph()
• interpolate: passed to ggplot2::annotation_raster

Examples

# Plot with base R
plot(logo)

# Plot image with ggplot2
library(ggplot2)
myplot <- image_ggplot(logo)
myplot + ggtitle("Test plot")

# Show that coordinates are reversed:
myplot + theme_classic()

# Or add to plot as annotation
image <- image_fill(logo, 'none')
raster <- as.raster(image)
myplot <- qplot(mpg, wt, data = mtcars)
myplot + annotation_raster(raster, 25, 35, 3, 5)

# Or overplot image using grid
library(grid)
qplot(speed, dist, data = cars, geom = c("point", "smooth"))
grid.raster(image)