Originally Posted by AV Science Sales 5
Are you asking about using NLS (non lineal stretch) on a Lumagen compared to using an A-lens? If so, some people use this to stretch 16:9 images to fill their scope screen. NLS is not used on scope images.
Before anyone runs away with this being an idea solution since it's in a Lumagen and therefore must be good
you should realise how this works to fill a scope screen:
1. Zoom the image so that a 2.35:1 image fills the 2.35 screen and the 200 or so rows of pixels are projected off the top and bottom of the screen (the black bars).
2. Change the output resolution of the Lumagen such that for 16:9 viewing this content is shown within the now zoomed screen height, therefore 16:9 is now shown at approx 1400 x 800 resolution. In other words it is a rectangle surrounded on 4 sides with black borders, the top and bottom pair being projected off the top and bottom of the screen as per 1 above.
3. Use the NLS setting so that the 16:9 content is now electronically stretched from 1400 x 800 so that the 2.35:1 screen is now filled. You now have an image that is stretched at the sides (like when a TV stretches 4:3 to fill a 16:9 screen) but importantly, you have also reduced the resolution as well, so are viewing 16:9 content shrunk and stretched to 2.35:1 at 1920 x 800 pixels.
However, if you have a Lumagen you have another option (apart from just watching it in 16:9 with side masks which suits me fine
1. As per 1 above.
2. Set up a memory in the Lumagen so that the masking is adjusted so that the top and bottom of the image is cropped off to fit the 2.35:1 screen. You then at least see what is left of the cropped image at 1:1 pixel mapping, so less artefacts than the process described above. Of course parts of the image will be cut off and it might mean people's heads and subtitles being cut off. This is a similar effect as watching a 16:9 film using an A Lens and vertical stretch (except the vertical stretch involves scaling).
Note that neither of these solutions will help those wanting to use a curved screen without an A Lens, just those who insist on viewing everything at 2.35:1 on their 2.35:1 screens. Personally, I found that the recent addition of some simple black velvet side masks means that I no longer feel the need to fill my 2.35:1 screen for everything, despite having a Lumagen.