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Brenda, Chris -- thanks for your comments.
Brenda, you say that your eyedropper used the color from one pixel, and that you use Photoshop. I use Phototshop Elements, a slightly stripped down version of Photoshop. However, in Photoshop Elements -- and I'll bet it's this way in Photoshop, also -- you have an option to sample one (1) pixel, nine (9) pixels or twenty five (25) pixels when you click your eyedropper anywhere inside your image area.
In Photoshop Elements, when you click on (select) your eyedropper, a little box appears in a "task bar" just above where you find your eyedropper. It shows a small, square picture of your eyedropper and a drop down menu. This drop down menu lets you decide whether you're going to sample a "point sample," which is just one pixel; 3X3 pixels (9), or 5X5 (25) pixels.
If you choose the 3X3 or the 5X5, you will be selecting an average color from the larger pixel area. This is a nice feature because, as you say, each pixel in a digital picture is one color, and one color only. So, if you happened to land on the only green pixel in a field that seems to be red, you'd be in trouble. But, you would be alright if you had used, say, the 5X5 (25 pixel) sample.
Hope this makes sense. Surely, Photoshop has a similar situation in which you can choose how many pixels you are going to sample.
Note: I just discovered that Photoshop also allows the same sampling options. Just look straight up to find the "task bar" where the drop down menu appears.
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