wallpaper

Given a square image, this script creates a wallpaper with

• an upscaled, blurred version of the image in the background, and
• an upscaled version of the image in the foreground.

Usage

./run <path-to-image>

• Writes to output.png in the current directory.
• Reads config.json in the current directory for config. See below for the format of this file.

Example

Input	Output	Config
		{ "bg": { "blur": 15, "delta": 60 }, "fg": { "upscale": 2, "border": 0 }, "rotate": 0, "height": 2778, "width": 1284 }
		{ "bg": { "blur": 25, "delta": 0 }, "fg": { "upscale": 2, "border": 10 }, "rotate": 90, "height": 2778, "width": 1284, "enable_fg": true }
		{ "bg": { "blur": 25, "delta": 0 }, "fg": { "upscale": 2, "border": 10 }, "rotate": 90, "height": 1080, "width": 1920, "enable_fg": true }
		{ "bg": { "blur": 0, "delta": 0 }, "fg": { "upscale": 1, "border": 0 }, "rotate": 0, "height": 2778, "width": 1284, "enable_fg": false }

Config file

The config file is a JSON file with the following structure:

{
    "bg": {
        "blur": 15,
        "delta": 60
    },
    "fg": {
        "upscale": 2,
        "border": 0
    },
    "rotate": 0,
    "height": 2778,
    "width": 1284,
    "enable_fg": true
}

• bg:
  • blur: Gaussian blur sigma for the background image.
  • delta: Crop the background image by this amount (in pixels) on the top and bottom.
• fg:
  • upscale: Upscale the foreground image by this factor.
  • border: Add a white border to the foreground image of this width.
• rotate: The amount to rotate the original image by (counter-clockwise, in degrees)
• height: The height of the output image.
• width: The width of the output image.