vegas pro - how to set hexadecimal color values

Solution 1:

You may use, for example, the website RGB to HSV color conversion to convert the colors from RGB to HSV.

For your example of #0099cc, when entering the hex value and pressing Convert:

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The HSV values are in percentage, so need to be divided by 100. This then gives: 1.95;1.0;0.8. The R,G,B values are divided by 255 to change the range from 0..255 to 0..1.

I have heard it mentioned that if you change the color picker to RGB, Vegas Pro will use RGB values. (I don't use it so cannot verify).