The waveform in LW is scaled from 0-100, is this based on RGB (0-255) or R709 (16-235)?

you can choose which one you need
right click on the top of the window as far as I remember

adjustment is for vector scope not waveform, anyone else?

I generated a gradient

16 to 235 shows 0 to 85% on the waveform
0 to 255 shows 0 to 100% on the waveform

from RGB 0 0 0 to RGB 32 32 32 you always get 0% on the waveform

2 possibilities:

the waveform is wrong or the gradient generator is wrong...or both....

Hi royfphoto

As far as I can tell Lightworks operates/processes video in a YUV colour space environment not RGB.

It conforms to ITU-R-BT-601 standard for SD
ITU-R-BT-709 standard for HD

The Standard colour space environment in YUV is 16-235 = RGB 0-255
The Expanded colour space environment in YUV is 0-255 = RGB 0-255

I haven't found any switching available in Lightworks for Expanded colour space, so I assume it is set to Standard. I would therefore assume the waveform display scaling would also assume O IRE units to be black and 100 IRE units to be peak white.

FWIW. I notice that there are also no Gammut Limiters or RGB Limiters which can be applied to the O/P within Lightworks but usually these are supplied with any attached I/P O/P hardware devices anyway for example the Black Magic drivers and or Matrox Hardware.

Hope that helps.

Cheers
RO

I created a png graphic in an external photo editing app with a 0 to 255 gradient and imported it into Lightworks. Added it to an edit. The waveform monitor shows a straight diagonal line from 0% to 100%. I created another from 32 to 0 and the waveform monitor shows a straight diagonal line from 13% to 0%.

I don't know for sure but it seems Lightworks works in RGB 0 to 255 (actually it converts to floating point 0 to 1. So what you put in is what you get. As to color space, I don't know. Though in the LwFxResource.dll file there are some references to color space conversion effects. These might get applied automatically at import time or they might be used to convert RGB to YUV for use in the Waveform Monitor.