Forum: Animation


Subject: 720x480

Bongo opened this issue on Jan 31, 2005 ยท 16 posts


Bobasaur posted Wed, 02 February 2005 at 2:18 PM

Markshun, I beg to differ with your usenet video group's recommendation. As mentioned, video uses a .9 pixel ratio - the vertical is .9 of the horizontal. Poser does not render in the rectangular pixels of video, it uses the square pixels of a computer. Therefore you have to convert the number from one relevant to rectangular pixels to one relevant to square pixels. The '480' figure is in rectangular pixels and therefore is .9 of what the square pixel number would be. If you do the math the formula would look like this: 90/100 = 480/x (where 'x' represents the square pixel dimension) When you solve for x you find that the actual number of square pixels should be 533.333333. For your image to perfectly convert, you'd render it at 720 x 534 and then import that into a program capable of converting the square pixels into rectangular pixels. It MediaStudioPro is a true video editing program it should be able to do so. I do this professionally for both broadcast TV commercials and corporate materials. I normally create my graphics at 720 x 540 (square pixels) because that dimension is a true 4:3 ratio and my work often goes to Digibeta or BetaSP tape (which has a 720x486 dimension) as well as to DVD. In fact, that's the square pixel Preset dimension for full screen TV offered in Adobe After Effects. Technically when I take it to DVD there are 6 pixels (540-534=6) worth of vertical distortion but that's better than the 54 (534-480=54) pixels of vertical distortion that would occur if I used 720x480 square pixels. As far as your "visible area" reference, there is a "video safe area" which is usually set at 90% of the image resolution. For ease of memory I usually create a 720x540 graphic in Photoshop and then use a 640x480 rectangle. You can also create a "Title Safe" area by shrinking that 640x480 rectangle 90%. Both the video safe area and title safe area are displayable on most professional video editing programs. They're probably available in that MediaStudioPro. In fact, it may come with a sample still image of the proper dimensions displaying the video safe and title safe areas in it's "goodies" (I've seen that a few times with different software).

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