Oh right I suppose it makes it a bit difficult but I suppose you can always ask someone how the colours look or to help with the palette.
Straight ramp meaning the Hue is the same for light and dark.
Your skin tone uses a straight ramp as opposed to the red-orange for example.
Open colour picker and click through different ramps with eye dropper and you will see the Hue (H) shifting.
A common example of this is some greenery would be warm yellow in the sunlight, cooler green through to dark blue (and low saturation is good at that point).
Cute edit Ran