Tableau comes pre-packaged with many useful color palettes. Tableau also allows you to use a custom sequential or custom diverging palette from withing Tableau. Unfortunately the custom option only allows a two color options. But lets say you see a Tableau packages 3-color-palette you like and you want to make a few adjustments to it and make it lighter or darker. Here is an example of what I did to the temperature palette, I added 2 lighter lights.
The first think you will need to do is of course take a screen-shot of the tableau palette. You can then paste that into a paint program and use the eyedropper tool. I suggest that you download a free tool such as Paint.Net. That program gives you an eye-dropper tool and gives you the color code in hexadecimal (ie #FFFFFF is white). Unfortunately Microsoft’s pre-loaded paint program doesn’t give you this info. It can be converted from the link below though if you don’t want to download Paint.net.
Go to http://colllor.com (I have no idea how to pronounce that, I can only assume its similar to the many ‘L’s after someone scores a goal in soccer), choose paste in the hexadecimal (or choose it from the selector). Collor will give you a wide range of similar colors. I was interested in the shades/tones section right on top. I wanted to take the default temperature palette that Tableau provides and lighten it up for a bit. Another option for finding similar colors and hex numbers is this website http://encycolorpedia.com/. It could be useful in certain circumstances, but it provides far too many options. So instead the links below will be via colllor. I used the eyedropper tool and found that Tableau has these 5 colors for that first temperature palette.
I have gone ahead and picked two sets of lighter Tableau Temperature colors: “Lighter” and “Lightest”.
Navigate to here: C:\Users\<username>\Documents\My Tableau Repository\ and edit Preferences.tps in a text editor (make a copy in case). Between the <preferences> tag add in this XML
<color-palette name=”Temperature_Lighter” type=”ordered-diverging”>
<color-palette name=”Temperature_Lightest” type=”ordered-diverging”>
This will give you two additional temperature palettes.