REDcolor4 LUT

REDWideGamutRGB is the new standardized colorspace option for RED footage. It can reproduce a much larger range of colors than REDcolor4, which is very useful for shots that have high saturation levels. However, it will look desaturated on a Rec709 monitor.

Our LUT converts REDWideGamutRGB to REDcolor4 using additional saturation mapping for out-of-gamut colors.

Background

Currently Rec709 is the colorspace standard for HDTVs and consumer displays. It is depicted as the triangle below, surrounded by all visible colors of light. If a color falls outside of the triangle, it is considered out-of-gamut and cannot be seen on the display.

Digital cinema cameras (like RED) capture a much wider gamut of color than Rec709 devices can reproduce. In order to view the image properly, some color transformations must take place.

Example

The REDWideGamutRGB colorspace encompasses every color the camera sees, but it appears desaturated on a normal Rec709 device:

REDcolor4 scales up the saturation, but it is unable to reproduce all the colors that were captured by the camera. This eventually can result in clipping image data for out-of-gamut colors:

Using REDWideGamutRGB combined with our REDcolor4 LUT, gamut mapping can be controlled while still achieving a decent level of saturation:

The differences can also be seen on a color chart:

The LUT does not merely increase saturation but instead matches REDWideGamutRGB to REDcolor4 – allowing for more consistency when intercutting footage using both colorspace settings. Learn more about the Camera Profiling process.

Download

You can download the free REDcolor4 LUT here:
www.truecolor.us/downloads/redcolor4-lut/

To work as intended, the source material needs to be set to REDWideGamutRGB / REDlogFilm. The suggested workflow is as follows:

If you have any feedback regarding the LUT, please let us know.