Blur the image background

Objectives & Principles

Blur the background of an image. We are given the original image, and the product segmented from that image (with an alpha mask). This livebook does not cover segmenting the background from the image.

Install Dependencoes

Mix.install([:image, :kino])

original_image = Image.open!("/Users/kip/Desktop/original_image.png")
product_image = Image.open!("/Users/kip/Desktop/product.png")

# The inverted mask masks the product (not the background)
inverted_mask = Image.invert!(product_image[3])

background = Image.add_alpha!(original_image, inverted_mask)

# Blur only the rgb channels, then add back the mask
# which has crisp edges
blurred_background = Image.blur!(background[0..2]) |> Image.add_alpha!(background[3])

composed = Image.compose!(blurred_background, product_image)