Tableau provides several color options to visualize the data into different chart forms where a lot of color options are available already and if we need to add more colors then we can customize the color palettes where Tableau Desktop comes with color palettes that have been carefully designed to work well together and effectively apply color to data in many situations, such as on maps, heat maps, bar charts, etc. You can also create and use your own custom color palettes by modifying the Preferences.tps file that comes with Tableau Desktop.
The Preferences.tps file is located in your My Tableau Repository. The file is a basic XML file that you can open in a text editor to modify. An unedited preferences file looks like this:
we can add as many custom palettes as you like to your Preferences.tps file, each with as many colors as you want. When we modify Preferences.tps to add colors, use the standard HTML format for the new colors (hexadecimal value #RRGGBB or Red Green Blue format). When you save the workbook and restart Tableau Desktop, the color palette names you added to Preferences.tps appear in the Select Color Palette drop-down list (Edit Color dialog). You can use a new palette like you would any other.
Tableau doesn't test or support custom color palettes, so be sure to back up your workbooks before you continue. Also, there is no guarantee that custom color palettes you create will work with future Tableau Desktop upgrades.
When you edit your Preferences.tps file, be sure to use straight quotation marks (' ' or " ") to delimit the palette name and type, not curly quotation marks (“ ” or ‘ ’).
To edit your preferences file:
Go to the My Tableau Repository folder in your Documents directory, and open the Preferences.tps file.
Between the opening and closing
workbooktags, insert opening and closingpreferencestags.
For more options to modify the preferences file:
https://help.tableau.com/current/pro/desktop/en-us/formatting_create_custom_colors.htm
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