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The central area of the Lagoon Nebula has intense blue-green emission of OIII atoms, and there is also a lot of broad band blue light. The "yellow" (I like to think "gold") arises because I have mapped the strong blue-green of OIII emission to the green channel so I can use the blue channel for broad band blue light. Superimpose these colours on a fainter background of red H alpha and the result is gold. I guess it is all a matter of one’s own sense of beauty ... the HST colour palette is very fashionable even though it does not map the emissions to "true colour" (the colour most people would see if they could see saturated colour in nebulas).
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