The Eyedropper tool (I) is really useful for reading the values of colors and tones in your images. If you open the Info panel (Window>Info), you can see the color values. The panel and Eyedropper work hand in hand. As you move the Eyedropper, the values constantly update to show what’s beneath your cursor.
What if you want to freeze these values? You know, have them stay in the box. If you click-and-hold on the Eyedropper in the Toolbar, you’ll see a Color Sampler tool. This looks like the Eyedropper but it includes a crosshair. Click on the image with the Color Sampler and it will drop a little crosshair, and those values will show up in the Info panel labeled #1, #2, etc. You can add up to 10 samples. So, how do you remove those samples when you no longer need them? Hold down the Option (PC: Alt) key and hover your cursor over a sample. Your cursor will turn into a pair of scissors, and you can click to remove the sample.
This tip originally published in Colin Smith’s “Photoshop Tips” column in the June 2023 issue of Photoshop User magazine.