[js1138]

I'm not getting the conceptual difference between the missing pixel and the missing color.

[Alamo-Girl]

Thank you for your reply!

I'm not getting the conceptual difference between the missing pixel and the missing color.

A missing pixel will be a gap in the image on the screen or paper. It might appear as black space on the screen or white space on paper. It is null, not there, empty, void.

With a missing color, all pixels still appear but the color is often wrong. The image is faithful but not true when a primary color is missing. In the extreme, imagine a color portrait converted to black and white.

Primary colors can be added or subtracted - the effects can be seen at this link.