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Chapter 18. CONTROLLING BITMAPS > TROUBLESHOOTING BITMAPS

TROUBLESHOOTING BITMAPS

  • Nothing is free. When you rotate, skew, or stretch sprites, you take a speed hit. You cannot expect to have dozens of constantly rotating sprites on the Stage and others stretched with quad and still have your animation running as fast as an animation without all that. Keep this in mind when designing.

  • If a 32-bit image is displayed incorrectly, or it looks different in the Paint window than on the Stage, try turning off the “Use Alpha” property. Sometimes bad Alpha channels creep into 32-bit images.

  • Using straight PhotoShop documents with an Alpha channel produces a “premultiplied” Alpha channel. This just means a white halo appears around the images. One easy way to correct this is to open the file in Macromedia Fireworks first, save it as a PNG file, and then import that file.


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