Re: New HD Media Center Edition



"Ted Miller" wrote:

>
> "dwswager" <dwswager@xxxxxxxxxxx> wrote in message
> news:1123703261.296601.17210@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > For your application (I also am a Nikon Boy), the key is matching the
> > image resolution to that of the TV. If your shooting 6MP RAW, you need
> > to downsample the image in Nikon Convert or Photoshop to the number of
> > pixels being displayed on the screen. Hence on a 720p set, the image
> > should be no more than 1280 x 720.
>
> Why? Any slideshow application (including the one in MCE) will shrink the
> image to fit in the available output resolution.
>

Becasue an image must be targeted specifically to the output in terms of
both color, luminosity and sharpening. Yes of course, and the photomat can
make a print. I suspect Nikon Boy is looking for more than that.

> > Oh and to screw you up even more
> > check the pixel size. Images use square pixels. NTSC uses non-square
> > pixels so the aspects are different.
>
> NTSC doesn't use 'pixels' at all. It uses 480 lines which are scanned with
> an electron beam in a continuous, non-discrete motion. On a computer, NTSC
> video is typically represented as 640x480 (square pixels) or sometimes
> 704x480 or 720x480 (non-square pixels).
> >

And of course an image based on square pixels converted to a format
represented by nonsquare pixels will either not maintain it's aspect ration
or have to be resampled which introduces all new problems.

> > I'll clue you in now. Your photos will never look as good on a TV
> > screen as they do on a computer monitor. Two reasons. First your
> > monitor is refreshing the screen between 70 and 85hz.
>
> Photos on my 50" plasma TV look just as good if not better than on an LCD
> computer monitor.
>
> > TV in the USA
> > Refresh at 60hz (30hz effective for interlaced resolutions like 1080i).
>
> This has little to do with how good a picture looks, and in any case NTSC TV
> refreshes at 60 *fields* per second (effective 30 frames) and 1080i ATSC is
> the same.
>
> > Second, Your smearing the data over a much larger area. Compare a 19
> > inch monitor to say a 50 inch TV. This is much like the dithering
> > issue with inkjet prints. If you view from far enough back that you
> > can't see the dither then it looks fine.
>
> No, not the same issue. Dithering attempts to simulate a larger range of
> colors than are physical available. A TV or computer monitor don't have
> issues with dithering. You might argue that a larger monitor could be
> subject to pixellation, but this has to be evaluated on a case by case
> basis.
>

Think of making a poster print from a 35mm slide here. Pixelation is a real
issue. At normal viewing distances it won't be a problem. Tell that to the
guy vieiwng prints with a 10x loupe though.

Bottom line here is the images aren't specifically targeted for output on
the TV and Nikon Boy is the type of photographic enthusiast his screen name
implies, he will be unhappy with autopilot results he gets just dumping 6MP
Nikon NEFs to the screen.

He will want to account for:
1. Different Color Space
2. Lower Dmax
3. Lower resolution
4. Different pixel aspects

I just went through this in a DVD project. You can do it the quick and easy
way or the long, complicated way. Depends on the results you want.


.

Relevant Pages

  • Re: Canon EOS 5D Review
    ... Have you got an explanation why the resolution of the D2X is ... I see also what the caveat of the APS sensor is - one needs to compare the ... then show that the Nikon is by a factor of about 1,5 better if one takes the ... > camera but as their pixels are significantly smaller, ...
    (rec.photo.digital.slr-systems)
  • Re: Nikon and Megapixels
    ... Does it even occur to you that a doubling of pixels from 12 Mpix to 24 is only a 41% increase in resolution for a given sensor area? ... Does it occur to you that the resolution of these 21 - 24 Mpix cameras is about the same as the high end MF cameras - just with fewer overall pixels. ... and the Nikon fans seem to have some digesting it is that Canon beat Nikon to full frame and to higher pixel counts leaving Nikon users cold. ...
    (alt.photography)
  • Re: Canon EOS 5D Review
    ... sensor, but this paragraph from your review is questionable. ... camera but as their pixels are significantly smaller, ... theoretical resolution can not be realized due to the less efficient ... The linear resolution of the Nikon would be ...
    (rec.photo.digital.slr-systems)
  • Re: Canon EOS 5D Review
    ... Have you got an explanation why the resolution of the D2X is ... D2X as with the larger Canon sensor, that would mean that more than ... >then show that the Nikon is by a factor of about 1,5 better if one takes the ... owing to it's larger pixels. ...
    (rec.photo.digital.slr-systems)
  • Re: [SLE] Need advice
    ... Pixels are display device entities. ... Are you thinking of half-tone screens? ... the principals and the engineering practice. ... jagged because of low resolution, ...
    (SuSE)
Loading