Lesson 11 Quiz

GIMP is a full-featured, open-source image editor that covers most of the retouching, selection, and layering tasks that photographers need, making it a practical entry point for learning digital editing without a software subscription.

Keyboard shortcuts speed up repetitive editing steps. Creating a new layer with Ctrl+Shift+N keeps work on separate levels, making it possible to adjust or delete one element without affecting anything beneath it.

Holding Shift while drawing with the Elliptical Marquee constrains the selection to a perfect circle. Without that constraint, the tool produces ovals, which are rarely what is needed when isolating round subjects.

Feathering blends a selection's boundary by spreading the transition across a specified number of pixels. The result is a gradual fade rather than a hard cut, which makes composites and adjustments look natural rather than pasted.

Applying Gaussian Blur to a selected background layer mimics the way a wide aperture throws distant planes out of focus, isolating a subject without changing the actual camera settings.

The Magnetic Lasso traces a path along strong tonal contrasts between a subject and its background. It works well on clearly defined edges but struggles where the subject and background share similar tones.

The Magic Wand selects pixels that are similar in tone and color to the spot you click, within a tolerance you set. It works well on areas that stand apart in tone or color, such as a clear sky. A Hue/Saturation layer and a layer mask change or hide pixels; they do not make a selection.

Adjustment layers apply tonal or color changes through a mask that can be painted on or off, leaving the original pixel data untouched. This lets photographers experiment and revise without permanent consequences.

The Liquefy tool lets you push, pull, and warp pixels as if they were soft material. Photographers use it to reshape contours, reduce distracting bulges, or make subtle adjustments to posture and proportion in portraits.

On a layer mask, black paint conceals the corresponding pixels on that layer, revealing whatever is below it. White reveals, black hides: this simple rule governs all mask-based compositing and selective editing.