Crop an image to its content bounding box — image_crop_to

Removes background-coloured margin from the specified edges of the image. The first non-background pixel found on each edge defines the crop boundary.

Usage

image_crop_to_content(image, direction, background)

Arguments

image: An image list.
direction: One of "left", "right", "horizontal" (both left and right), "top", "bottom", "vertical" (both top and bottom), or "all" (all four sides).
background: Numeric vector of length 4 with RGBA values in [0, 1] defining the background colour to crop away.

Value

A new image list with cropped dimensions.

Examples

cube <- generate_cuboid(c(0, 0, 0), c(1, 1, 1))
img <- render_mesh(cube$vertices, cube$triangles,
                   options = render_options(background_color = c(0, 0, 0, 0)))
img <- image_crop_to_content(img, "all", c(0, 0, 0, 0))