How to Make a Dual-Tone Pressure Brush in GIMP

Creating a dual-tone brush in GIMP allows digital artists to seamlessly blend between the active foreground and background colors using the pressure of a graphics tablet stylus. This effect is achieved through GIMP’s Paint Dynamics engine by mapping stylus pressure directly to the brush's color output using an active Foreground-to-Background gradient. Following the steps below, you will configure a custom dynamic, assign the correct gradient, and achieve dynamic two-color blending in your strokes.

Step 1: Open the Paint Dynamics Dialog

  1. Launch GIMP.
  2. In the top menu, navigate to Windows > Dockable Dialogs > Paint Dynamics.
  3. In the Paint Dynamics panel, click the Create new dynamics button (the notepad icon at the bottom of the panel). This opens the Paint Dynamics Editor.

Step 2: Configure the Pressure-to-Color Dynamic

  1. In the Paint Dynamics Editor, name your preset (for example, "Pressure Color Blend").
  2. Locate the dynamics matrix, which lists inputs along the vertical axis and outputs along the horizontal axis.
  3. Find the Pressure row and track across to the Color column.
  4. Check the box at the intersection of Pressure and Color.
  5. Close the Paint Dynamics Editor. The new dynamic is automatically saved.

Step 3: Configure the Brush Tool Options

  1. Select the Paintbrush Tool (P) from the Toolbox.
  2. Go to the Tool Options panel.
  3. Under the Dynamics section, click the dynamic preview icon and select your newly created dynamic ("Pressure Color Blend").
  4. Expand the Color Options subsection located beneath Dynamics in the Tool Options panel.
  5. Set the Gradient to FG to BG (RGB).
  6. Ensure the Repeat option is set to None.

Step 4: Set Swatches and Paint

  1. Click the active Foreground Color swatch in the toolbox and pick your starting tone (e.g., light blue).
  2. Click the active Background Color swatch and pick your secondary tone (e.g., deep purple).
  3. Test your brush on the canvas using your pressure-sensitive stylus. Applying minimal pressure outputs the foreground tone, while increasing pressure progressively blends the stroke into the background tone.