At the risk of boring you to death, they use that number and not a sliding percent of threshold because 255 equals the largest number you can represent in an 8-bit number. If you slide the slider all the way to the right, you will find that the highest value for the tool - the highest level of threshold - is "255", which is really an uber-geek notation for "make no distinctions - include everything". ![]() That slider (and the numbers next to it) indicate a degree of difference between the base pixel you select from and the most-different pixel color the tool will select. Now, what does that mean? Take a look at your tool options for a second and notice that there's a slider there marked "Threshold". ![]() they all fall inside the same color threshold as the first pixel you selected What the magic wand does is select an area of all the pixels in an image which meet the following criteria: That's sorta weird, huh? You got a lot of area that's surrounded by the "marching ants", but not all of of the picture was selected. Now - without changing any of the tool's setting, click someplace on the cheekbone of the knight's head. In that snapshot of my desktop (I'm using my Mac laptop), you can see that I have selected the wand tool, and I have the tool options open so we can sort of skip over the basics. Well, let's open it in the GiMP and find out. But how did I peel it off the photo without, for example, picking up any of the grain of the chess board? This is also the image I used to nab the knight for the image we looked at, above. The image below was downloaded from, and falls under the wikimedia license for wikimedia images: But before we talk about the tool, let's all get the same base image to work with. That's where the magic wand (or, as the GiMP calls it, the "fuzzy select") tool comes in. And to make an image like this from other images, you have to be able to select areas of an image in ways a little more, um, artistic than merely using the rectangle-select tool. See: this image has 4 components - the white background, the foreshortened logo which looks like it's laying flat on a surface, the shadow over the logo but under the knight, and the knight itself. How do I go about building or designing really cool images like this one: OK: we have covered the really no-brainer tools in the tool set, but as we said, those tools aren't really all that better than the one you get with MS Paint.
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