How to resize keeping the quality???EXPERTS????THANXS!!!!

[fgtan]

I have tons of vcds with a really good quality, 352x288, and I want to convert them to dvd resolution 704x480.
Just using tmpgenc it expands the image, givin me a bad result...

Any ideas, or filter, or softwares to use, so I can have the same quality as in my vcds???


Thanxs

[jkl]

sorry but you can't. all that you do when you resize larger is fill in missing space by expandining pixels(little blocks). the more you increase the size the bigger the blocks get.

[BJ_M]

the best program to do this is either "eyeon digital fusion" or RAYZ

but neither works with mpeg files .. you have to save your mpeg as frames or avi ..

[ahfairley]

sorry but you can't. all that you do when you resize larger is fill in missing space by expandining pixels(little blocks). the more you increase the size the bigger the blocks get

If jkl were talking about still pix he would be wrong - a program like Photoshop doesn't just increase the size of the pixels, it uses "bicubic interpolation" to create new pixels based on the color and luminance of the surrounding pixels when it upsizes. My guess is that the same can be done for video with the right program. I would think it would take a while though, you would have to resize frame by frame.

Since you can't really get more information when you upsize, have you thought about burning to DVD as half D1 (352 x 480). I can't tell the difference between D1 and half D1 capped and burned from old 8mm home videos.

Alan

[sterno]

VirtualDub and AVIsynth both have bicubic resizing functions. They both have two types of resize functions, bicubic and bilinear. In general bilinear is better for reducing the size and bicubic is better for increasing the size.

[jkl]

If jkl were talking about still pix he would be wrong -

ok i'm wrong, i'll admit there is a way. but i doubt he is going to do it frame by frame. even for a clip 60 secs long. at a frame rate of 20fps, that would be 1200 frames. yeah, i really doubt he will do that.

[vhelp]

evening.

fgtan,
* First, you got the 352x288-to-704x480 incorrect (though you can do
the convert that way)
* the 352x288 is PAL specifics, vs. 352x240 which NTSC specifs
* Now, you wanna convert the 352x288 (whatever) to 704x480, which
you can do, but the quality will suffer because, (a) you are stretch
ing to high the resolution, and (b) you will get more blurryness out
of this higher stretch.

My guess, is that you are thinking that if you take any kind of
MPEG ie VCD w/ 352x288 and convert up to so called DVD specs, that
you will in effect, GET DVD QUALITY! But, NOT gonna happen. Doesn't
matter if you know for sure that the source is from a direct DVD
rip. You are simply using too low a resolution source for this.
You see, the 352x288's resolution was set, hence whatever quality
was left, is gone. There's really no mericle filter like the so
call bicubic that will increase the qualiy, despite what has already
ben posted (falsely in this case) - - You know this to be true, as
you have already done this.

vdub and AVIsynth have these bicubic resizers, but that's still not
going to help you here, as you've ben mislead due to the missunder
standing w/ the resizer. You see, the resizer will yield that or
shall I say, WORK as the posters above has mention, but ONLY IF,
the source is already at 720x480 for instance!! NOT when the size
in finalized as is, in your case, 352x288!!

It's really not worth even going 352x480 NTSC, again, as your source
is PAL specs. And, NO, not even if you shoot for 352x576 PAL. You
wont get the sharpness that you would normally get IF your source
was original higher than 352x288, ie,
* PAL: 352x576, 704x576, 720x576
* NTSC: 352x480, 704x480, 720x480

Here is the rule of thumb in 99% cases:
----------------------------------------------
Resizing would be:
- - SOURCE - - - - - - - - VCD - - - xVCD/xSVCD/CVD - SVCD - - - - - - DVD D1 - - DVD
* 352x240/288: - - 352x240/288
* 352x480/576: - - 352x240/288, 352x480/576**
* 480x480/576: - - 352x240/288, 352x480/576, 480x480/576
* 704x480/576: - - 352x240/288, 352x480/576, 480x480/576, 704x480/576
* 720x480/576: - - 352x240/288, 352x480/576, 480x480/576, 704x480/576, 720x480/576

** you can get away 704x480/576 on some source materias, but depends on quality of it.

Please correct me on the DVD D1, and DVD D2, etc above, as I may have placed
incorrectly.

I hope the above help anyone else w/ this issue.
Later.

-vhelp

[fgtan]

the best program to do this is either "eyeon digital fusion" or RAYZ

but neither works with mpeg files .. you have to save your mpeg as frames or avi ..

Any ideas where can I get them for a trial??? Changing the vcds back to avi is not a problem...

Thanxs again

[vhelp]

fgtan,

just continue doing what you were... load them up in vdub, and save
as, another AVI format, ie, Huffy, or PIC or whatever format you
prefer.

-vhelp

[BJ_M]

RAYZ is/was a super program used for many a hollywood flick (unix and nt versions) but apple bought them out and whats going to happen is a big ???? as its not seemly sold anymore (just like spruce and a few other programs - apple is doing us in).


http://vixen.eyeonline.com/dfreg/demo/access2.asp is the legal demo version of fusion ...

http://www.eyeonline.com/products/index.html info on the program ...

its a $5000 program but RAYZ is 3x as much so its a bargin ..