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By J. Ortega, R. Voight

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The stylus could end up anywhere: at least a mouse can’t be more than a cord’s length away. My main problem with the stylus, though, was that although it seemed perfectly adequate for shading and painting, it was too clumsy for web browsing and general use. There’s also the problem that while a mouse moves the cursor in the direction you choose – and you can site a mouse anywhere on the mouse pad while you drag it around – the stylus and tablet have a one-toone relationship with the monitor: the top left corner of the tablet represents the top left corner of the screen.

Entering a figure of 1 pixel in the dialog removes the white by sampling the colors just inside the radius specified, and pushing those colors outwards to replace those already there. It gets rid of the white, but is a little clumsy: we tend to get hard blocks of unwanted color this way. There are times when deleting a pixel all the way round doesn’t work – if the elements on the layer are particularly fine, for example. In these cases, you need to take a more painstaking approach: lock the transparency of the layer using / and then, using a small soft-edged brush, paint around the edge of the layer, sampling the adjacent colors with the Eyedropper tool frequently as you go.

It performs a task almost identical to the Replace Color dialog, discussed earlier in this chapter, but it has one significant advantage: you can paint the new color directly onto the image, without having to go through a dialog first. In one way, it’s simply more satisfying to paint the new color straight on. But there are many other advantages to the new tool: where Replace Color would globally change one color for another, the brush allows us to mix our colors at will. In addition, we can control the area we color with more precision than we could with the dialog.

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Solution of Partial Differential Eqns on Vector and Parallel Computers by J. Ortega, R. Voight

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