Well, #ff0000 is the definition of &quot;red&quot; within the RGB colorspace,  corresponding to the full brightness of the &quot;red&quot; (only) pixel components, constrained by your monitor&#x27;s limited reproduction gamut.<p>So yeah, it&#x27;s &quot;red&quot;. But it&#x27;s not the color of anything that has ever been viewed by humans in real life (except itself). There are few pure colors in nature anyway, but you can talk about &quot;red&quot; being wavelength of the center of the &quot;reddish&quot; range of the visible light spectrum.<p>Of course, names for colors are always subjective. Crayola might be the best universal reference. Crayola red bears little resemblance to #ff0000, even discounting the pigment vs. light mixing and perception differences.<p>But you have to call it something, right? So #ff0000 is &quot;pure red, RGB, luminous&quot;. :)