2012年10月15日星期一

Design Pixel Perfect Photoshop


Design Pixel Perfect Photoshop

When creating Web and app interfaces, most designers slave over every single pixel, making sure it’s got exactly the right color, texture and position. If you’re not careful, though, some common functions like moving, rotating and pasting can undo your hard work, resulting in a blurry mess. But with some small changes to your workflow, you should be able to maintain the highest-quality artwork from the start to the end of the project.Pixel-Perfect Rotation
If you’re not careful, rotating layers in Photoshop can damage them in a very noticeable, pixel-mashing way.
When rotating layers with Free Transform (and some other tools) to exactly 90 or 270°, the quality of the outcome is determined by the layer’s size. If the layer is of an even width and even height, then you’ll be fine. If it’s of an odd width and odd height, you’ll also be okay. But if they’re of an odd width by even height or even width by odd height, then you’ll see something like the result below:In this case, the artwork is 20 × 9 pixels: even-by-odd dimensions. The results for bitmap layers and vector layers are different, but they both produce unusable results because the origin of rotation doesn’t fall on an exact pixel boundary.
A Fix
Because even-by-odd or odd-by-even dimensions are the problem, we need a way to ensure that the contents of the layer are odd-by-odd or even-by-even. Probably any method you can think of will solve this problem, be it adding a square bitmap mask to a layer or adding more content to the layer that you’re rotating. You could also draw a square on another layer and rotate both at once.
As long as the dimensions for the layer or layers are even-by-even or odd-by-odd, it’ll be fine.
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