Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

Manual – Table of Content

Chroma keying basic

Table of Contents

Green Screen / Blue Screen

This page explains how to combine a video and background by adding transparency to the video using the Chroma Keying Basic Filter of mimoLive™.

To learn more about how to work and set up a Green Screen including correct lighting refer to Chroma Keying.

Chroma keying basic

Activate the Chroma Keying Basic filter

Navigate to the fx dropdown menu and activate the Chroma Keying Basic filter.

c80a2bb3 154c 4e2e b142 39caf165862c

Setup: Auto Adjust

2451713e 365e 4b4f a150 a72da25cad43 edited
bc4976b5 978d 4b49 84c3 55e98f6c397a

The Chroma Keying Basic Filter is a quick and easy solution. There is an Auto Adjust option available. By clicking on the “Start” button the filter will analyse the current video image and try to find optimal values for the current content. Later on you can fine adjust the values.

*In order to let the Auto Adjust work properly please step out of the green screen so that the video frame just shows the backdrop.

Manually Setup

This is a step by step procedure on how to setup the Chroma Keying Basic Filter:

ee7abc4e 1017 49a0 8b00 0ba5019543c5

1. Switch to the “Hue Setup” view by selecting it in the “Mode” popup menu. A rainbow bar with a histogram should appear at the bottom of the filter preview area. The histogram tells you how much of a certain color is seen in the video. The maximum peak should be your backdrop color.

83e76908 85a0 43e5 b928 afb13dbda159

2. Now you can either click with the mouse cursor into the filter preview and select the backdrop color you want to key directly in the video or adjust the “Hue Min” and “Hue Max” values to select the backdrop color. You can do so either with the parameters or drag them in the histogram.

3. After you selected the hue of your backdrop color you need to specify the saturation. Please use the “Mode” popup menu to switch to the “Saturation Setup” view.

58080dea a337 4c35 aeab 9591c6e5fee9

4. Use the “Saturation Min” and “Saturation Max” parameter to narrow down the selection of your color range. You can do so either with the parameters or drag them in the histogram.

5. The next step is to specify the lightness. Please use the “Mode” popup menu to switch to the “Lightness Setup” view and clamp the reds in the histogram like you did with the “Saturation”.

228b57b2 313a 4c65 9880 97bc8ce2ab5f
  1. 6. If you switch to the “Feather Check” view with the “Mode” popup you can see wether your key is good or has still pixels that aren’t keyed out correctly. The blinking red dots tells you that this particular pixel has some transparency with it. This may not be a bad thing because this is exactly what is desirable for hairs. If there are unwanted artefacts you need to go back to step 2 and refine your settings. The “Feather” value let you widen or shrink the feather area.
41fa152b 960d 4f9d a033 ae332cdd3b5e

7. Finally you may switch to the “Despill Check” view with the “Mode” popup. This view shows you in a blinking manner where the backdrop spilled onto the actor and what the despill feature will change. You can setup the “Despill Amount” (how much the backdrop color should be changed) and the “Despill Color” (the color which is used to replace the spilled backdrop color). It makes sense to set the Despill Color to the same tone that the inserted background will look like in the

f3f6a3dd a6cd 41fb 88c3 20b70bd6d0d2

Adding A Drop Shadow To Create Illusion Of Depth

If your final background will be a wall of any kind (e.g. a weather map) you may want to have a drop shadow on this wall to create the illusion of depth. The “Drop Shadow” option will allow you to control the offset of the drop shadow in “X” and “Y” direction as well as the “Opacity” and the “Blur”.

1fe51253 69dc 400c a4ed af4c46ed4baa
eba04807 b6de 452f a588 aaca480e16e0

Applying A Quick Mask To Cover Unwanted Content

If your video image shows some unwanted pixels at the edges you can crop them away with the “Quick Mask” option. E.g. this is helpful if your chroma key backdrop is not wide enough to fill the complete video frame.

22e95bb4 7a3c 4b27 9acf 1ebf638e5d03
af1330cc a872 4f39 b3e4 1e7a70797712

Checking The Result On A Sample Background

In the filter setup you have the option to add a sample background to check if your chromakey works well. Make sure to choose a background that matches the final background of your video production the most. You have the options to have

  • No Background
  • Custom Image
  • White
  • Black
  • Custom Solid Color

Adjust the Color Of The Video Frame

Sometimes it may be necessary to apply some color corrections before the chroma keyer can do a proper job. In the “Color Correction” section you can adjust “Saturation”, “Brightness” and “Contrast”. However we recommend to fix the backdrop and your camera settings before using this option.

Your Feedback

How would you rate your experience with this feature of mimoLive?