Subtract Freehand Selection from Ellipse in GIMP

Modifying active selections in GIMP allows for complex masking and precision editing by combining different selection tools. To subtract an irregular freehand shape from an existing elliptical selection, you combine the Ellipse Select Tool with the Free Select Tool (Lasso) set to the "Subtract from the current selection" mode. This technique enables you to carve out customized, non-geometric sections from smooth circular or oval boundaries.

Step 1: Create the Initial Elliptical Selection

Select the Ellipse Select Tool from the toolbox or press the shortcut key E. Click and drag on your canvas to establish the initial elliptical or circular selection boundary.

Step 2: Switch to the Free Select Tool

Activate the Free Select Tool (commonly known as the Lasso tool) from the toolbox or by pressing the shortcut key F. This tool allows you to draw irregular, freeform boundaries around any part of the image.

Step 3: Enable Subtract Mode

Look at the Tool Options dock, typically located beneath the main toolbox on the left side of the screen. Under the Mode setting, click the fourth icon representing Subtract from the current selection.

Alternative Shortcut: Instead of clicking the icon in the Tool Options dock, you can simply press and hold the Ctrl key on Windows/Linux or Command on macOS before starting your selection. A small minus sign (-) will appear next to your cursor, confirming that subtract mode is active.

Step 4: Draw and Close the Freehand Shape

Click and drag to freely draw the irregular contour you wish to remove, ensuring the path crosses into the existing elliptical selection. Complete the freehand shape by connecting the end of the line back to the starting point or by double-clicking.

Once closed, the overlapping area created by the freehand selection will instantly be subtracted from the elliptical selection, leaving only the remaining customized shape active on the canvas.