A layer with 100% opacity is completely opaque.

A layer with 100% opacity is completely opaque.

• A. False
• B. True
• C. Depends on blending mode
• D. Only on background layers

Answer: (B)

Opacity controls how transparent a layer is. When opacity is 100%, the layer’s pixels are fully opaque, so nothing from the layers beneath shows through at those pixels. That makes the statement true. Blending modes change how the layer’s colors interact with underlying content, but they don’t make a 100% opaque layer partially transparent. A layer mask can hide parts of the layer regardless of opacity, but that’s a separate visibility control, not a property of opacity itself. The idea that it depends on blending mode or only applies to background layers isn’t accurate.

Opacity controls how transparent a layer is. When opacity is 100%, the layer’s pixels are fully opaque, so nothing from the layers beneath shows through at those pixels. That makes the statement true. Blending modes change how the layer’s colors interact with underlying content, but they don’t make a 100% opaque layer partially transparent. A layer mask can hide parts of the layer regardless of opacity, but that’s a separate visibility control, not a property of opacity itself. The idea that it depends on blending mode or only applies to background layers isn’t accurate.