Within the Settings tab of the Envision App, you can adjust the color detection preference. 

Envision can recognise a Standard Palette of 30 colours or a Descriptive Palette of 950 colours.

How to change the color detection preference? 

To adjust this setting, follow these steps:

Step 1: Navigate to the Settings tab within Envision App.

Step 2: Go to Color Detection and do a one-finger double tap. A new screen will open. 

Step 3: On this screen, you can change the Color Detection preference. You can switch between the Standard or Descriptive palettes according to your preference. 

For more information on how to enable this feature, see Detect Colors