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To: lightwave@webcom.webcom.com
Subject: Re: Graphics resolutions for video
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Date: Fri, 11 Aug 95 19:15:04 PDT
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Joe Freeman writes:
>I had some more thoughts on your message after I repied.
>>
>> When rendering graphics, e.g. on Photoshop, at 640x480 size in order to
>> transfer to video and do DVE's, what is the ideal resolution (dpi) to work
>> with so that you don't use anymore storage space than necessary, but do
>> not compromise on the final video output?
>
>When going to video forget about dpi. When you change to 752 by 480, by
>resizing or addition to the sides of a 640 by 480, you must also take into
>account video overscan. TVs don't show the entire picture area the way a
>computer monitor does. <SNIP>
It's worse/more complicated than that.
Toaster fs=752x480.
PAR =752x480
PVR
They vary somewhat in what they leave in the
>overscan, border, area. Generally it is accepted that the middle 640 by
>400 of a full averscan video display will be seen by all TVs. This is
>called the text safe area. A slightly larger area but not the entire
>picture space is called the graphic safe area.
>
>Your 640 by 480 might present problems when trying to get the usefull
>information into the 640 by 400 depending on the content and intended
>use. I get stuff all the time designed for print media. It usually
>has text right to the edges of the picture. I usually have to extend
>the backgrounds to 752 by 480 rather than size up the original.
>
>I usually run it through lightwave, mapped onto a plane rectangle sized to
>fill the screen, to do the antialiasing and bring the colors into ntsc
>legality. I save it as an rgb or a framestore ready for use in my
>project. You can also see the safe areas in LW and deal with extending
>the background for the overscaned areas there. Sizing the plane to the
>safe area and set up an appropriate background.
>
>I don't have direct access to photo shop on my computers but I can do
>almost anything it can do right through LW with a little thought.
>
>Joe Freeman the Video Junky vidjunk@yakko.cs.wmich.edu
>--
>Joe <vidjunk@yakko.cs.wmich.edu> sent this message.
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