General Forum

Re: photo's viewing on BeoVision 7-40MKIII

rvanham — Fri, 26 Oct 2007 02:26:02 GMT

thanks jvezina,

I cerntainly am going to try this, but one questions remains. Why downsampling and upscaling in the firts place. Why not send the JPEG info directly to the monitor screen? If I put the same cd with JPEG's in my laptop and conect this to the BeO 7, the result is perfect. Why can't the BeO 7 handle this?

thanks

Re: photo's viewing on BeoVision 7-40MKIII

jvezina — Thu, 25 Oct 2007 21:09:04 GMT

The problem is that the JPEG viewers used in most (if not all) DVD players use a very simple algorithm for resampling still images to the DVD player native resolution. Unfortunately, the built-in DVD player in the Beovision-7 also suffers from that limitation. I have also an upscaling Sony DVD recorder and it's not better in that aspect. Good downsampling is not trivial and requires a computationally expensive algorithm.

The workaround is to resample the images using a computer program that uses a better algorithm to 640x480 (NTSC) or 768x576 (PAL) pixels and to prepare a disk with the resampled pictures (keep your originals intact).

The steps are:

1- Download and install the IrfanView free image processing program.

2- Open the original image.

3- In the menu, select Image, then Resize/Resample.

4- Set the vertical resolution to 480 (NTSC) or 576 (PAL). Select the Lanczos filter (that's the key to obtain good results). Make tests with both resolutions.

5- Save the image to a new name in JPEG format with the 90 quality setting.

6- IrfanView has a batch mode that allows the conversion of several pictures in one run.

7- Burn a disk (CD or DVD) and put the new images.You will see a substantial improvement in quality. Put a few original images and you will see the differences.

When I was using the Sony DVD recorder with my MX-5000, the limitations of the downsampling algorithm were not as noticeable, but with a high definition TV, this is different.

Good luck!

Jean

Re: photo's viewing on BeoVision 7-40MKIII

Bingo — Thu, 25 Oct 2007 10:50:33 GMT

Because Beovision 7 MKIII does not have pixel-mapping?

photo's viewing on BeoVision 7-40MKIII

rvanham — Thu, 25 Oct 2007 10:26:20 GMT

I noticed that photo's (JPEG) played from the internal DVD player are much better on the BeoVision MKIII then on the MKII. However pictures played from a computer via the VGA connection are indeed much and much better still. Why is this?

regards