Casio projector colors do not match colors on Macbook air screen, casio projector colors do not match colors on Macbook air screen

When I hook my MacBook Air to a Casio projector, the sky blue colors on the Macbook screen look purple on the projector image.  It occurs whether I use a VGA or HDMI connector to display port so it can't be the cable.  I tried adjusting colors in the display preferences and on the projector. Doesn't help.  Any other ideas?

There is one point which nobody have made mention of, which also is something anyone who works in print should know about.
The first thing to know is that there are some Green and Red Pantones that are IMPOSSIBLE to reproduce on screen because of the limitation of the RGB gamut. (The RGB of screens can only reproduce a bit more than 60% of the real-life colors and around 50% of the Pantone are situated inside the remaining missing 40%. Almost EVERY Pantone, on your charts, that are situation on the 2 top and 2 bottom positions are not reproducible on screen.)
So, it's always normal that some Pantone never look the same between a screen and the Pantone chart even if the screen is calibrated in the best ways and that is why you uses a Pantone chart. The Pantone chart isn't just a "decision" tool, but also a "preview" tool so that you can see the exact final color regardless of what's on screen.
If that is not working with your workflow, then it simply means that your workflow is flawed as it's how it has been made to be. It's not a choice, but a limitation of physics with computer hardware which you have to live with as a professional.

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