Aspect Ratio
- Thread starter Guessmaster
- Start date
Buff Jigsaw
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This is because a tv has a different pixel aspect. Hopefully future versions of Chankast will have aspect correction. However, VGA mode should be correctly.
OP
Guessmaster
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- Thread Starter
- #4
Could you explain the difference, out of curiousity?
Dreamcast displays the picture similarly with VGA output, except the Dreamcast boot logo is in 640 pixels.
I'd make a disc with pictures of circles and stuff with a DC image viewer and use that for comparision, but I don't have access to the computer with Chankast at the moment.
Buff Jigsaw
New member
Guessmaster said:
A pixel on a computer monitor is square whereas a pixel on a tv screen is rectangular. The image aspect of a tv and a monitor are close but each have different pixel aspects. So if you were to take a 720X486 D1 ntsc frame, you would need to resize it to 640X480 (creating a very slight vertical stretch) in order to view it on a monitor correctly.
ScorpionZero
New member
Interesting, how did you take the exact same picture from both sources? It looks like you got it on the same frame too. :happy:
OP
Guessmaster
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- Thread Starter
- #7
It's an easy shot because she stands there like that for a few seconds 
Nightmare
(when dream come true)
give me a gun please, i'm gonna liberate the forum from those guys
it's the worst thread ever, it sould be closed before they develop other stupid theories like "no-real balck screen (when you switch on your tv) wich is not implemented yet in chankast"...
it's the worst thread ever, it sould be closed before they develop other stupid theories like "no-real balck screen (when you switch on your tv) wich is not implemented yet in chankast"...
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Nightmare said:
Er... don't know what offended you here...
Chankast obviously doesn't have aspect correction yet as the shots shows. I'm sure the authors will implement an aspect ratio correction feature later on, since it is a feature that quite a few emulators provide (eg. ePSXe, ZSNES).
Nightmare
(when dream come true)
Clements said:
a screenshot of a guy who is unable to set his tv parameters correctly ?
a pixel is a pixel, you can't correct his aspect, or you have to connect your computer on a tv screen if you want to obtain the same result...
concerning epsxe, zsnes an other emulators, its not an aspect correction, they only add differents screen mode, and add the possibility to output the result in differents ways (with stretching/scalling features)... it's not the same thing.
an image with 640x480 pixels on chankast has also 64Ox480 pixels with the dreamcast, so want do you want to correct ? those guys clearly don't know what they're talking about...
when i said the thread should be closed, it was not a request, it was just a manner to tell them what i think about their theories...
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Nightmare said:
Agreed.... besides on the real console it didn't really matter about the aspect ratio because the dreamcast outputted everything to a 3:4 ratio, as it should. You only have to worry about resolutions on newer consoles that support progressive scan and all this other nonsense.
Also it should be noted that your video card will NOT do this for you. As you said you need to adjust it. And yes the tv-out and the regular monitor out have seperate adjustment settings on any decent video card.
Buff Jigsaw
New member
HowardC said:
you mean 4:3 aspect, not 3:4. Anyhow, you are wrong.
Buff Jigsaw
New member
Nightmare said:
"a pixel is a pixel" is ignorance. Why would an anamorphic dvd appear correct on a widescreen tv unless the pixels were strethced horizontally? A non anamorphic dvd (SAME DAMN RESOLUTION) would appear incorrect on a widescreen tv. That is because real time correction occurs dumbass. An anamophic dvd is corrected to view on a non-widscreen tv correctly. Real time aspect correction. D1 was invented many decades ago and is not resolute in its pixel dispersion. You need to understand this if you are going to understand the past 20 years of video games being played on pc monitors and modern tvs.
If you worked in broadcast or vfx you would understand that it is not a simple matter of authoring on pc then exporting to ntsc.
you need to understand that if you are preparing an image for ntsc playback you need to compensate for its natural distortion. If you plan to view the result on a pc you need to counter compensate the distortion.
it is not a theory, it is plain fact.
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Nightmare
(when dream come true)
Buff Jigsaw said:
really ? your are a funny guy ! do you know what is a pixel ??? it's only the result of a signal send by your computer or your console, the result of an impact signal on a crt screen and the result of a reaction signal on a lcd screen... since it's only a signal you can't have any control on it (except for color of course)...
Buff Jigsaw said:
plain fact ? really ? this "plain fact" is based on how it look like, and i told you how it work in the real world !
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the Black border around the edges on the dreamcast is for overscan on your TV, you also get this on some DVD's, Some N64 games (F-Zero). instead of making the image fill the resolution they some times put a black border round the edges as it takes up less info on DVD's and less processing on console games
Buff Jigsaw
New member
Nightmare said:
*sigh*...read this... http://www.adobe.com/support/techdocs/1809a.htm
here is a quote if your lazy.
"Editing DV or D1 source footage accurately in Adobe After Effects can be challenging because DV and D1 footage consists of non-square pixels while computer monitors use square pixels to display images; this difference often causes DV and D1 footage to appear stretched on computer monitors. Because of the discrepancy between square and non-square pixels, graphics created with square pixels may not scale correctly in non-square compositions. By using the correct composition preset, preparing graphics with the appropriate frame size, and interpreting the pixel aspect ratio of imported files correctly, you can accurately edit, view, and export non-square pixel source footage. For more information, see "About D1, DV, and various pixel aspect ratio footage," "Setting pixel aspect ratio," and "Using square-pixel footage for output to D1 or DV NTSC" in After Effects Help."
Buff Jigsaw
New member
Nightmare, read this. It will help you to understand how all this stuff works. Its a good read.
http://nickyguides.digital-digest.com/interlace.htm
http://nickyguides.digital-digest.com/interlace.htm
Buff Jigsaw
New member
For the record I am fully aware that IF the DC does EVERYTHING internally at 640X480 than it should be proper on both pc and tv. However, the original post pics on this thread looked exactly like a classic ntsc capture that did not scale properly on a pc. The DC's signal mode must be dynamic. Does RE have variable output modes?
OR, the orignal pics were CAPTURES rather than Chankast in which case it makes sense that they are the inconsistent.
OR, the orignal pics were CAPTURES rather than Chankast in which case it makes sense that they are the inconsistent.
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