![]() ![]() I am using the thin gray line as an easy way to illustrate the change the Video Limiter is about to make. NOTE: These chroma levels are not, in themselves, illegal. Luma levels are pushing 110% and chroma saturation is exceeding the inner boundary. NOTE: Adding the Limiter to the Adjustment Layer means that it is processed after all color effects applied to the clips themselves. Then, drag the Video Limiter on top of the Adjustment Layer. Instead, search for Limiter in the Effects panel. The Lumetri Color Panel does not have a Broadcast Safe filter built into it. Then, drag that Adjustment layer so it is above all the clips in your timeline. In the Project panel, right-click in the gray area and select New Item > Adjustment Layer.Īccept the settings displayed in the Adjustment Layer panel, these will match your project settings. The Video Limiter, which is what Adobe calls this effect, works best when it is applied to an Adjustment layer placed above all the clips in your project. The Clamp Signal checkbox at the bottom of the Lumetri Scopes affects the scope display only and does not change the video levels in your clips. This catches any excessive levels that may have slipped through the cracks. Generally, you apply the Broadcast Safe effect to a completed project after all color grading work is complete. ![]() Any effects added after this that adjust luma or chroma levels means that you lose the protection afforded by the Broadcast Safe filter. The Broadcast Safe filter must be the last filter applied to a clip.Pure white or pure black do not allow any saturation. ![]() Saturation levels decrease the closer a pixel gets to luma levels of 100% or 0%. Video supports the greatest amount of saturation at 50% gray. NOTE: Acceptable saturation levels vary by luma levels. The image above is from Adobe Premiere the white boundaries indicate chroma saturation levels about 75%. Chroma levels can not exceed the color targets on the Vectorscope.(Personally, I try to set my white levels to 98%, just to be safe.) There are several basic rules about levels that apply in both applications: ![]() The effect would mush all the lovely white texture of the white lace into an amorphous blob, resulting in life-long animosity from the bride. But you would NOT use the Broadcast Safe effect to protect white levels on a close-up of a bride wearing a white wedding dress. You would use the Broadcast Safe effect to clamp, say, video levels coming from street or ceiling lights, where you don’t care about retaining texture detail about the light. (100% in the case of Luma levels.) This clamping means that any texture or detail associated with those levels will be lost. What the Video Limiter/Broadcast Safe effect does is clamp – or lock – luma and chroma levels so that they don’t exceed a specific level. The only exception is when you create images on the computer, which makes it easy to create images with excessive levels. NOTE: While there are also limits on chroma saturation, most of the time chroma levels will be fine. This is because the technology involved in each of these distribution platforms has limits and excessive luma levels, especially with highlights, will get your program rejected by QA (Quality Assurance) at the distributor. If you are creating videos exclusively for the web, you don’t need to worry about illegal luma or chroma levels.īut… if you are creating programs for broadcast, cable, DVD, DCP or HDR, then video levels are critically important. ![]()
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