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This guide discusses a complete color palette for season one Princess Luna. Luna's colors were hard to decide on, because most of the options I was picking from printed color guides in overprint preview were producing something that was not to my liking in terms of differences from everything we have available on Luna. In the end, I felt the best result was to pick the best values in sRGB colorspace and let the cards fall where they may, since most users are probably just eyedropping these things anyway. Without some insight from the person who actually chose these colors in the first place, there's only so much reverse engineering can do.
Note that Luna's palette has changed consdierably in Season 2. Until I get a new color guide up, read the following journal post for more information. [link]
The intent of using a standard color library (Pantone Solid Coated) is to stay within the bounds of said official artwork, plus give some consistency to colors used. This should help when sourcing supplies for non-digital work. If your application does not support color libraries, then using the eyedropper on the swatch should give you an answer. However, this means you lose the more accurate simulations available by using Overprint preview mode.
This guide is not affiliated with Hasbro in any way and is produced solely in the interest of color science. For a changelog, more long-winded explanations, and other discussions, see this forum topic: [link]
They need to show Princess Luna more.
I personally like her Season 2 design.
Because of such things, I practically spent 4-6 hours trying to redesign Luna's colours in order to have a decent base for my Luna-related artwork (see examples here: [link]).
We'll see if she gets any tweaks in her upcoming episode!
*Giggles, squees then explodes... then explodes again*
This was a very useful comment.