Join Chris Meyer for an in-depth discussion in this video Working with pixel aspect ratios, part of After Effects Apprentice 04: Layer Control.
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Most of the compositions in this lesson were created at a size that's suitable…for standard definition video and when we talk about standard definition we talk…about an image aspect ratio that's four units wide to three units tall.…If you were to pull out a calculator that would be four divided by three equals…an image aspect ratio of 1.333.…However, you might have noticed in most of the compositions we created and…footage we used don't match these number.…Go back to After Effects, to Composition > New Composition…and look at Standard Presets like NTSC, D1 or DV.…
these have dimensions like a 720 x 480 or in the case of the D1, 720 x 486.…The PAL standard has even different numbers, such as 720 x 576.…And if we were to haul out our calculator again and do clear, 720 divided by 486,…we'd find that we're nowhere close to 1.33 Image Aspect Ratio.…We have something strange here. 1.48 with a bunch of numbers afterwards.…
What's going on here?…Well, it's video's fault.…Most computers draw each pixel, each picture element, square. As wide as it is tall.…
The After Effects Apprentice videos on lynda.com were created by Trish and Chris Meyer and are designed to be used on their own and as a companion to their book After Effects Apprentice. We are honored to host these tutorials in the lynda.com Online Training Library®.
- Sliding and trimming
- Slip-editing and insert-editing layers
- Employing blending modes to enhance layers and composites
- Applying, modifying, and saving animation presets and layer styles
- Using adjustment layers to affect multiple layers
- Experimenting with effects using Brainstorm
- Understanding pixel aspect ratios