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Add padding (border) to image

Source: R/masks.R
img_pad.Rd

Adds a border of pixels around an image. Useful for ensuring objects don't touch image edges before flood fill.

Usage

img_pad(img, n = 10, value = NULL)

Arguments

img

Matrix or array. Image from img_load() or binary mask

n

Integer. Number of pixels to add on each side. Default 10

value

Numeric or logical. Value for padding pixels.

  • For grayscale (0-255): Default 255 (white)

  • For masks: Default FALSE (background)

  • For color: Specify as c(R, G, B) or single value (default 255)

Value

Padded image with dimensions increased by 2*n in each direction

Examples

if (FALSE) { # \dontrun{
img <- img_load("leaf.png")
img_padded <- img_pad(img, n = 20)
dim(img)        # e.g., 100 x 100
dim(img_padded) # 140 x 140

# Pad a mask
mask <- img_mask(img)
mask_padded <- img_pad(mask, n = 10, value = FALSE)
} # }