Create a Retro Synthwave Sunset in GIMP

Creating an authentic 1980s synthwave sunset background in GIMP involves combining neon color palettes, geometric perspective grids, a sliced glowing sun, and vintage post-processing effects. This guide walks you through the step-by-step process of setting up your canvas, generating the iconic retro-futuristic landscape, and applying retro digital textures using GIMP’s built-in tools.

1. Set Up the Canvas and Sky Gradient

  1. Open GIMP and create a new project via File > New (e.g., 1920x1080 pixels).
  2. Select the Gradient Tool (G).
  3. Set your Foreground color to a deep purple (#1a0033) and your Background color to a vibrant hot magenta (#ff007f).
  4. Set the gradient shape to Linear and drag from the top of the canvas to roughly two-thirds down to create the night sky.

2. Create the Perspective Grid Floor

  1. Add a new transparent layer named "Grid Floor".
  2. Fill the lower third of the canvas with solid black to establish the horizon and ground.
  3. Go to Filters > Render > Pattern > Grid.
  4. Set the line color to bright cyan (#00ffff) or neon pink (#ff007f), adjust the spacing to roughly 40–60 pixels, and set the line width to 2 pixels.
  5. Select the Perspective Tool (Shift + P) and pull the top-left and top-right corners inward toward the center horizon line to create 3D depth receding into the distance.
  6. Lower the layer opacity slightly or duplicate the layer, apply Filters > Blur > Gaussian Blur (around 5–10 px), and set the layer mode to Addition to make the grid glow.

3. Design the Sliced Retro Sun

  1. Create a new layer named "Sun" placed between the sky and the grid layer.
  2. Select the Ellipse Select Tool (E), hold Shift to maintain a 1:1 aspect ratio, and draw a large circle resting on the horizon.
  3. Use the Gradient Tool inside the selection with a gradient transitioning from bright yellow (#ffff00) at the top to vibrant orange or pink (#ff0066) at the bottom.
  4. To create the iconic horizontal synthwave slices, switch to the Rectangle Select Tool (R).
  5. Select thin horizontal strips across the lower half of the sun, making each subsequent cut thicker as you move down toward the horizon, and press Delete to clear each strip.
  6. Deselect (Ctrl + Shift + A), duplicate the sun layer, apply a Gaussian Blur (15–20 px), and set the blend mode to Addition for a neon glow.

4. Add Horizon Mountains

  1. Create a new layer named "Mountains" directly above the Sun layer.
  2. Use the Free Select Tool (L) or Paths Tool (B) to draw jagged, low-poly mountain silhouettes along the horizon line.
  3. Fill the selection with very dark purple or black.
  4. Right-click the Mountain layer, choose Alpha to Selection, go to Select > Border (2 pixels), create a new layer, and fill the border with neon cyan or magenta to create a glowing mountain edge.

5. Apply Retro Post-Processing

  1. Scanlines: Create a new transparent layer on top of all layers. Go to Filters > Render > Pattern > Grid, set vertical lines to 0, horizontal line spacing to 4 pixels, line width to 1 pixel, and color to black. Lower this layer's opacity to 15–25%.
  2. Chromatic Aberration: Create a merged visible layer (Layer > New from Visible). Go to Filters > Light and Shadow > Lens Distortion or use Filters > Distorts > Shift on separate color channels to slightly misalign red and blue values for an authentic VHS aesthetic.
  3. Film Grain: Add a final transparent layer, go to Filters > Noise > RGB Noise, set the values low (around 0.10–0.15), and set the layer mode to Overlay with reduced opacity.