Make a frame to an image in Julia-CodePudding

Images are represented as matrices. Is there a practical way to make sort of frame around the content of the image? (in a monoton color)

CodePudding user response：

using Images, TestImages, Colors

img = testimage("mandrill")

padarray(img, Fill(colorant"magenta", (40, 40), (40, 40)))

magenta mandrill1

Update

I don't understand your comment - but you might be asking how you can use this padded image as a normal image? One way is parent.

img_with_pretty_frame = 
    padarray(img, Fill(colorant"magenta", (40, 40), (40, 40)))

w, h = size(img_with_pretty_frame)

img2 = parent(img_with_pretty_frame)

img2[w ÷ 2 - 100:w ÷ 2   100, h÷2 - 200:h÷2   200] .= colorant"blue"

img2

mod mandrill