利用者:Sobotka/Color Management/Color Primaries and Issues

A Completely Base Level Understanding of Primaries

The colour wheels have been somewhat managed in recent builds. There is more work to do on them. This document remains as a visual explanation as to what colour primaries are and how they factor into colour management.

Primaries

• If you were to use a very strong lens to zoom in on your display, you will see three components to each pixel, which are called primaries.

The three color components, or primaries, in a pixel on your display.

Controlling Primaries

• You can only increase or decrease the amount of light emitted from a primary light.
• You never can change the color of a primary.
  • The only way to change a pixel's color is by changing the levels of the primaries.
  • You can never make something more saturated beyond the original colors of the primaries.

You can never change the absolute color of a primary, you can only increase or decrease its intensity.

Different Primaries

• All displays have different primaries.
  • They are not just more saturated, they are wildly different colors of filters.
  • Tremendously expensive wide gamut professional displays have radically different primaries.
  • Even displays from the same manufacturer and the same model with identical part numbers will be slightly different, and drift with age.
  • Consider that every single Apple device since 2015 does not use the REC.709 lights that sRGB uses.

Primaries vary wildly across different manufacturers, different quality of displays, and even within identical models.

Colorspaces Have Different Primaries Too

• All working colorspaces have different primaries as well.

Primaries vary wildly across different colorspaces. This is purely a fictional image for explanation purposes and the colours shown have no bearing on their respective labels.

Color Wheels in Blender

• Color wheels in Blender simply dump the data value from minimum to maximum with no clue about the differences between spaces, which means the resultant color is totally random.
  • No amount of money spent on hardware can save you from this as only color management can.

When you take a color space and dump the values to an output, the output is totally random.

When Color Managed, the Output is Consistent

• When a system uses color management, the output is transformed to display the intended color as best as the output's primaries can. Someone working within Blender can select a colour that, within the limits of their hardware, represents the colour in their reference as closely as possible.

When all color is routed through color management, the colors can be controlled and displayed with accuracy.

All Color Must Be Color Managed

• A color that is output must always route through color management systems in place to avoid this chaos. Blender's color wheel currently doesn't, and must.