2.1.1172 Part 1 Section 19.5.63, rgb (RGB)

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a.   The standard does not state how to interpret a negative r attribute value.

PowerPoint decreases the red color value when the r attribute's value is negative.

b.   The standard does not state how to interpret a negative g attribute value.

PowerPoint decreases the green color value when the g attribute's value is negative.

c.   The standard does not state how to interpret a negative b attribute value.

PowerPoint decreases the blue color value when the b attribute's value is negative.