In our example, 100% opacity was set on the left image and all of the new background with a gradient on it can be seen at full strength. Lowering the opacity means the colour you're removing will still be partially visible. An opacity of 100% will completely remove the background, leaving just a transparency (the chequered pattern). This defines how strong the eraser tool you're using is. Leave it un-ticked and only the chosen pixel colour on the layer you have selected will be removed. If you tick this option Photoshop will erase all similar pixels from all the layers you have created not just the one you have selected. So if you have a building, tree branch or, in our case, a person and their hair separating some of the background the pixels which are similar in colour that are sat on the other side of the object won't be erased. With this ticked the Magic Eraser tool will only remove similar pixels that are sat next to each other. Why is this useful? Well when you add a new background, it will look like your subject belongs on that background rather than looking like something that was lifted from another shot and badly dropped onto something new. This is automatically checked and you should leave it this way as it helps smooth edges. ![]() ![]() Set a low Tolerance and Photoshop will only remove pixels that are more similar in colour to the pixel you clicked. The higher the number you type in this box, the more pixels will be removed in one go as Photoshop will know you want to remove pixels from a broader range. Adjusting the Magic Eraser tool Tolerance
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