Photoshop, the basics

Member lesson

Layers and masks, without destroying anything

Lesson 2 of 8 in Photoshop, the basics.

Checked against the makers' documentation on 9 October 2026.

Adobe Photoshop: Layer Masks Explained in 7 Minutes with Jesús Ramirez · Adobe Live
Lesson

Adobe's own help describes layers as transparent sheets stacked on each other, and that picture is worth keeping. Each sheet holds one part of the image. You can change, hide or move one without touching the rest, and what you see is the whole stack looked at from above. A phone photograph opens as a single locked Background layer. Since the May 2026 release there is a preference to open JPEGs as an ordinary layer instead, though Adobe left it off by default.

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  1. Question 1, locked

    You paint grey onto a layer mask. What happens to that part of the layer?

    • It is hidden completely
    • It becomes partly see-through
    • It is shown at full strength
    • It turns grey in the final image
  2. Question 2, locked

    A client wants back the shadow you removed last week. Which way of removing it would make that easy?

    • Erasing it with the Eraser on the photograph
    • Cropping it out with Delete Cropped Pixels on
    • Hiding it with black on a layer mask
    • Painting over it on the Background layer
  3. Question 3, locked

    What does Remove background in the Contextual Task Bar actually do to the photograph?

    • Adds a layer mask, so the edge can still be painted by hand
    • Deletes the background pixels permanently
    • Generates a new background from a prompt
    • Turns the photograph into a Smart Object

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