Re: Best pixel dimensions to display slides on TV?


"VidMan" <spammenot@xxxxxxxxxxxxx> wrote in message
news:vhanb3t7ui8k7gjaufm3rs6comscjmu2k0@xxxxxxxxxx
On Thu, 09 Aug 2007 16:57:19 GMT, "Dennis Pogson"
<dennis_nospampogson@xxxxxxxxxxxx> wrote:

isw wrote:
I'm in the process of scanning a couple thousand slides (nearly 40
years worth), at high resolution. I just want to get them digitized
before the fade any more.

Next, I want to prepare some "slide shows" for display on a standard
(not HD) television. I'll be Photoshopping them to improve color,
gamma, etc. I've noticed that (compared to lower pixel-count images)
it takes a while to display these, so I expect resampling to a lower
resolution will be a good idea too. What pixel dimensions are best
for standard TV display?

thanks, Isaac

I found 1024 by 768 appropriate when I did a similar project last year.

Dennis.


Considering that the highest resolution available from an NTSC signal,
that
being S-VHS quality, is only 400x576 and much of that is taken up by the
vertical blanking and sync lines, you really only end up with a max
resolution
of 400x485. Take away another 10-20 pixels on each side that are displayed
beyond the bounds of the usual TV display framing. Most TVs are adjusted
to have
the display "zoomed in" a bit make sure that the borders and sync bars are
not
seen. This is why you can see a ticker-tape scroll on the bottom of some
TV
displays more than others. Or a weather-alert radar side-bar showing fully
on
some TVs but cut off at the edge on others. No two different TV makes and
models
ever have the same out-of-bounds framing, and it can even vary from one
day's
production of TV-sets to another.

If your most used (or camera's default) image ratio is 4:3, then you'd do
well
to just go with 640x480. That will be more than enough resolution to play
back
on an NTSC (TV) display or the 400x575 max resolution for PAL display,
without
being able to resolve individual pixels. If you are not going to play back
through a S-VHS input then you could go even lower because the normal NTSC
broadcast resolution is no higher than 330x400. Anything beyond that is
wasted.
Just choose the highest resolution in the X or Y access available and
downsize
your images' X or Y axis to meet that. You won't get more detail than your
weakest link, that being your video's display resolution.

This is why an SLDC's (P&S's) lowest-resolution video of 320x240 is often
quite
acceptable if the main viewing method will be on a TV. Don't bother
wasting that
640x480 (or higher) memory gobbling resolution on a lengthy kids'-party
video if
you're only going to play it back on a standard TV.

Broadcast TV display has been surprisingly low-resolution all these years.
You
just never notice it due to average viewing distances and the mind's
ability to
invent the missing detail between individual frames of video. Even large
amounts
of noise in individual video frames becomes averaged out in your mind to
cause
it to disappear.
This is certainly correct. However, if the OP is using an HDTV, the best
pixel
dimensions are greater. Surely, the fine manual for the OP's TV discusses
this
setting more fully.

Back in the old days, getting more than 400 lines was unusual because the
horizontal oscilattor did not have sufficient power.
Jim


.

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