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Yep, HDMI devices have two different ways in representing intensity. 0 to 255, or 16 to 235. You want to use the latter, as that will allow the composite output of the converter to be more close to NTSC, otherwise it will be dark.
These devices simply fill the frame, so even if it's outputting 1920x1080, if the adapter even has the ability to downscale (unlike my Radioshack one), it will still be squashed into the 480i output. So it's up to your device to have the proper aspect ratio setting selected. IF it doesn't have it, then you might be out of luck, no matter what adapter you use. My Roku streaming stick won't do 4:3 on HDMI no matter what I do, so 4:3 content have black bars on the left and right side, however my PS3, even on the HDMI output (ignoring the fact it does have native composite output), DOES do 4:3 on HDMI, and it looks identical to its own composite output.
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