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Sampling Isn't Sampling

When you use the Healing Brush and Clone Stamp tools, you sample a photograph.

You press and hold Alt, and click on a photograph.

You may think that part of the photograph is sampled.

That's because of the term, sample.

And, perhaps, because the sampling cursor is circular.

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Let's say we sample the above forehead.

It's easy to think that the sample looks like the image below.

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And, it's easy to imagine this sample getting bigger or smaller depending on the brush size.

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Incorrect

Nope

As you probably surmised, the above is incorrect.

A sample isn't a sample.

A sample is a center point.

When you sample, you're choosing a new center point for the entire photograph.

When you enlarge the brush, you get more of the photograph, from the new center point.

For example, below, a point between the eyebrows was sampled.

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Correct

On the right side, above, the sampled area was cloned using three different sized brushes.

As the brush size size increased, more of the photograph was included.

With a small brush, you get a small portion of the photograph.

With a large brush, you'll probably get to much of the photograph.