[Math] Name for percentage as a decimal between 0 and 1 inclusive

Question

Problem

I'm unsure if I should be asking this here or on English Language, so sorry if it's not a good fit for a site.

I'm looking for a term that describes a number between 0 and 1, inclusive, that represents a percentage. For example, 0.5 would be 50%. I've considered decimal and floating point, but this doesn't convey the fact that such values should only be between 0 and 1 (as values outside this range can also be considered decimals and floating point numbers).

Context

In a programming library, there is a colour type. This type has a member function provides it's RGBA values in different formats, such as the one above. The term I am looking for would fit the following sentence:

Get the colour as a <insert term here>

Answer 1

So as to clear this off the unanswered queue (from comments):

A "portion of 1", or a "decimal portion of 1" seems to be agreeable.