Frank
Stunt Coordinator
- Joined
- Aug 4, 1997
- Messages
- 162
I've been playing around with capturing DVD images from a computer and manipulating them in Adobe Photoshop.
I have noticed that I can scale a DVD down to 360 by 240 pixels thus reducing its resolution to 25 percent of the original and the image looks just as sharp. If I then take the downsampled image and upsample it back to the original pixel resolution the images are basically identical.
I have tried numerous tests and they all seem to point to the fact that the effective resolution of these DVDs is no more then 360 by 240 and often less then that.
High resolution images that I downsample to 640 by 480 looks much, much sharper then any DVD. I even tried downsampling high resolution sources to 320 by 240 and they still look better then DVD quality.
I believe that the image quality of DVDs is seriously compromised by the resolution filtering that is necessary to make them look acceptable on interlaced NTSC displays.
I really wonder what a DVD could look like if it was mastered for a 480P display with no regard to how it looks on an NTSC interlaced display.
Frank
I have noticed that I can scale a DVD down to 360 by 240 pixels thus reducing its resolution to 25 percent of the original and the image looks just as sharp. If I then take the downsampled image and upsample it back to the original pixel resolution the images are basically identical.
I have tried numerous tests and they all seem to point to the fact that the effective resolution of these DVDs is no more then 360 by 240 and often less then that.
High resolution images that I downsample to 640 by 480 looks much, much sharper then any DVD. I even tried downsampling high resolution sources to 320 by 240 and they still look better then DVD quality.
I believe that the image quality of DVDs is seriously compromised by the resolution filtering that is necessary to make them look acceptable on interlaced NTSC displays.
I really wonder what a DVD could look like if it was mastered for a 480P display with no regard to how it looks on an NTSC interlaced display.
Frank