This setting adds the sampled color to the currently active color palette (see the Making Palettes section for more info on using color palettes). When selected, you can hold down the Ctrl / Command key to temporarily switch to set the foreground color instead. This automatically sets the current background color to match the sample color. When selected, you can hold down the Ctrl / Command key to temporarily switch to set the background color instead. This automatically sets the current foreground color to match the sample color. This setting displays the color in the info window if enabled, and nothing else.
This setting allows you to specify what you want to do with the sampled color: This is useful for sampling composite images that contain layers with transparent pixels, but it has no effect on a single-layer image, so it’s usually best to leave it enabled unless you specifically need to turn it off. This setting only applies to images with multiple layers, and it tells GIMP to sample all the visible layers at your click point as though they had been merged into a single layer. This setting is especially useful when picking colors from high-resolution photos since single-pixel samples don’t always match accurately with the color gradients in photographs, but don’t set the sample size too high! Sample merged
It probably shouldn’t be named “radius” since GIMP displays the current sample area size as a square centered around the cursor (as you can see above), but at least you can get a quick preview of the sample area by moving the cursor around over your image.
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