The Brave Rabbit shares his little script for Maya which will allow you to choose and convert corresponding Linear Color values.

The script helps to set the correct colors in the selected Maya node by automatically converting selected colors to linear color space, and always refreshes values based on the current selection in Maya making it possible to leave the window open while you are working in Hypershade or your Shader Editor of choice.

…icLinearColorChooser helps setting the correct colors right in the selected node. It automatically converts selected colors to linear space. It refreshes based on the current selection so that it’s possible to have it open all the time during the setup of shaders…

icLinearColorChooser assumes as a default that the incoming colors for a selection are in sRGB space and choosing the color in the script’s panel automatically applies a gamma of 2.2 and sets the color in the selected shader, alleviating the need for what could be typically endless gamma nodes for correction.

Just copy the script to any script directory that is accessed via maya. Run the script by executing “icLinearColorChooser” (without quotes) in the script editor. You may as well build a shelf button for easy access.