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Review questions

Q1: What is a blending mode, and what are the three types of color that are helpful for visualizing a blending mode's effect?
A1: A blending mode controls how pixels in an image are affected by the tools or other layers. It's helpful to think in terms of the following colors when visualizing a blending mode's effect:
  • The base color is the original color in the image.

  • The blend color is the color being applied with the painting or editing tool.

  • The result color is the color resulting from the blend.

Q2: What do the History palette, eraser tool, and history brush tools have in common?
A2: The History palette, eraser tool, and history brush tools can all revert your image to an earlier state so you can undo an operation or correct a mistake.
Q3: What is the difference between the art history brush tool and the history brush tool?
A3: The art history brush tool paints with a stylized stroke based on a selected state or snapshot. The stylized stroke of the art history brush tool simulates the look of different paint styles. The history brush tool paints a copy of the selected state or snapshot into the current image window. You can use the history brush tool to remove the strokes made with the art history brush tool.
Q4: Why would you use the smudge tool?
A4: You can use the smudge tool to soften the edges of your paint strokes. The smudge tool simulates the actions of dragging a finger through wet paint. The tool picks up color where the stroke begins and pushes it in the direction you drag.
Q5: How do you prevent layer properties from being changed?
A5: Locking layers and layer sets makes certain properties of a layer unchangeable. You can lock transparent pixels to confine your painting and editing to those areas of a layer already containing pixels. You can also lock image pixels and the position of an image layer.
Q6: Describe what the Gradient Editor dialog box is used for and how you display it.
A6: The Gradient Editor dialog box lets you define a new gradient by modifying a copy of an existing gradient. You can also add intermediate colors to a gradient, creating a blend between more than two colors. To display the Gradient Editor dialog box, select the gradient tool ( ) and click the gradient sample box in the tool option bar.
Q7: What are noise filters used for?
A7: Noise filters can create unusual textures or remove problem areas, such as dust and scratches from an image. The Noise filters add or remove either pixels or noise in an image with randomly distributed color levels.

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