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What's the difference between the Blur filter and the Blur tool?

You can apply the Blur tool as if it were a paintbrush to as small an area as you want. The Blur filter blurs the entire image or selection evenly.

If I change my mind about applying a filter, can I stop the process?

To cancel the filter as it's being applied, press Command+period (Mac) or Esc (Windows). To undo a filter, use the Undo command: Command+Z (Mac) or Control+Z (Windows). If it's too late to undo, use the History palette to revert to a stage before you applied the filter.

I have a photo that's slightly out of focus. Is there any way to make the subject stand out more?

Select the subject and copy it to a new layer. Use Gaussian Blur on the original, and Sharpen on the subject only.

Sharpen More applies _______ as much correction as Sharpen.

1. Exactly

2. Twice

3. Half

Gaussian Blur uses a _______ to determine how blur is applied.

1. Mathematical formula

2. Random memory algorithm

3. Prismatic crystal filter

Many experts advise applying which filter to every photograph you bring into Photoshop?

1. Sharpen

2. Gaussian Blur

3. Unsharp Mask

Fading a filter has this effect:

1. It fades an action such as applying a filter according to a percentage you determine.

2. It applies the filter at half strength.

3. It applies a 50% gray tone over the filter.

b. To get the same effect, apply Sharpen twice.

a. The blur follows Gaussian distribution (the bell curve).

c. The Unsharp Mask filter is especially helpful with scanned images.

a. You can fade from 100% down to 1%.