https://elsamuko.github.io/gimp-elsamuko/scripts.html

film_grain.rb

# encoding: UTF-8
#
# ELSAMUKO FILM GRAIN
#
# gem install --user-install ruby-vips
# gem install --user-install pry

require "vips"
require "pry"

INPUT_IMAGE_PATH = "input.jpg"
OUTPUT_IMAGE_PATH = "output.jpg"
HOLDNESS = 2
VALUE = 100
STRENGTH = 128
GRAIN_BLUR = 1
BLACK_WHITE = false

def elsamuko_grain(image_path, output_path)
  image = Vips::Image.new_from_file(image_path)
  drawable = image.get("drawable")

  bw_layer = drawable.copy(interpolate: true)
  grain_layer = Vips::Image.grey(1, 1)
  floatingsel = nil

  bw_layer.desaturate(:desaturate_lightness)

  grain_layer = grain_layer
    .draw_rect([128], fill: true)
    .add_noise(:hsv, 2, 0, 0, 100)
    .gaussblur(1, precision: :float)
    .paste(drawable.copy_buffer, true)

    floatingsel.anchor

    grain_layer.mask(curves: [:histogram_value, [0, 128, 255, 0, 255, 0], 6])

    image.insert(bw_layer, 0)
    image.insert(grain_layer, 0)

    image.write_to_file(output_path)
end

elsamuko_grain(INPUT_IMAGE_PATH, OUTPUT_IMAGE_PATH)

lomography.rb

# encoding: UTF-8
#
# ELSAMUKO LOMOGRAPHY
#
# gem install --user-install ruby-vips
# gem install --user-install pry

require "vips"
require "pry"

INPUT_IMAGE_PATH = "input.jpg"
OUTPUT_IMAGE_PATH = "output.jpg"
BRIGHTNESS = 0.5
CONTRAST = 1.0
SATURATION = 1.0
GRAIN = 0.05
VIGNETTE_BLUR_RADIUS = 200
VIGNETTE_OPACITY = 0.5
DISTORTION = 0.1
GAUSS_BLUR_RADIUS = 1
MOTION_BLUR_LENGTH = 20
MOTION_BLUR_ANGLE = 30
COLOR_PROFILE = "Vintage"

# Color Profiles
COLOR_PROFILES = {
  "Neutral" => [0, 0, 32, 16, 128, 192, 192, 228, 255, 255],
  "Old Red" => [0, 0, 0, 0, 128, 128, 128, 192, 255, 255],
  "XPro Green" => [0, 16, 64, 64, 128, 128, 192, 192, 255, 255],
  "Blue" => [255, 128, 64, 32, 0, 0, 0, 0, 0, 0],
  "XPro Autumn" => [255, 0, 0, 0, 255, 255, 255, 255, 255, 255],
  "Movie" => [16, 32, 64, 128, 192, 192, 192, 224, 255, 255],
  "Vintage" => [0, 20, 40, 80, 160, 200, 220, 240, 255, 255],
  "Xpro LAB" => [0, 0, 64, 128, 192, 228, 228, 255, 255, 255],
  "Light Blue" => [0, 32, 64, 128, 192, 192, 192, 224, 255, 255],
  "Pink Shadow" => [0, 16, 32, 64, 128, 192, 192, 224, 255, 255],
  "Redscale" => [0, 0, 16, 32, 128, 192, 192, 224, 255, 255],
  "Retro B/W" => [0, 32, 64, 96, 128, 160, 192, 224, 255, 255],
  "Paynes B/W" => [0, 16, 32, 64, 128, 192, 224, 240, 255, 255],
  "Sepia" => [0, 16, 32, 64, 128, 192, 224, 240, 255, 255]
}

def lomo(
    image,
    brightness,
    contrast,
    saturation,
    grain,
    vignette_blur_radius,
    vignette_opacity,
    distortion,
    gauss_blur_radius,
    motion_blur_length,
    motion_blur_angle,
    color_profile
  )

  image = image
    .linear(brightness, 0, contrast)
    .maplut(COLOR_PROFILES[color_profile])
    .colourspace("srgb")
    .linear(saturation, 20, 235)
    .gaussnoise(grain)
    .bandjoin(Vips::Image.black(image.width, image.height).gaussblur(vignette_blur_radius).linear(0, vignette_opacity))
    .composite(0, 0, composite_mode: :multiply)
    .distort("barrel", distortion)
    .gaussblur(gauss_blur_radius)
    .rot(angle: -motion_blur_angle)
    .similarity(angle: motion_blur_angle, scale: 1.0)
    .crop(motion_blur_length, 0, image.width, image.height)
end

# Load input image
input_image = Vips::Image.new_from_file(INPUT_IMAGE_PATH)

# Apply lomo effect
output_image = lomo(
  input_image,
  BRIGHTNESS,
  CONTRAST,
  SATURATION,
  GRAIN,
  VIGNETTE_BLUR_RADIUS,
  VIGNETTE_OPACITY,
  DISTORTION,
  GAUSS_BLUR_RADIUS,
  MOTION_BLUR_LENGTH,
  MOTION_BLUR_ANGLE,
  COLOR_PROFILE
)

# Save output image
output_image.write_to_file(OUTPUT_IMAGE_PATH)