Usage:

node bmpInspect.js file.bmp

where file.bmp is the path of the file to load. The JSON output will be saved to file.json, overwriting it if it already exists.

Input:

This program is compatibile with .bmp files exported by GIMP with default settings (24bit/ no alpha channel). Byte offsets and other information about the spec can be found at Wikipedia: BMP file format.

Output:

node bmpToJson.js square.bmp

The JSON output (square.json) is structured like so:

{
  "name": "square",
  "width": 3,
  "height": 3,
  "palette": [
    "0000ff",
    "00ff00",
    "ff0000"
  ],
  "pixels": [
    [0, 0, 0],
    [1, 1, 1],
    [2, 2, 2]
  ]
}

The image it represents is 3 pixels by 3 pixels in size. The top row is red, the middle row is green, and the bottom row is blue. The value in pixels[row][col] is the index of the corresponding color (hex string) in palette.

So for example if palette[3] has a value of 'FFFFFF', and pixels[0][4] has a value of 3, it means that the 5th pixel of the first (bottom) row is white.

JussaMouse/bmpToJson

Usage:

Input:

Output: