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The printing company that I use prefer all files to be supplied in RGB. The only problem for me is accidentally picking a colour that is too bright.

Is there an easy way around this? I recently heard about the gamut warning in Photoshop when picking colours so maybe I could use that.

Alternatively I could convert all images and swatches to CMYK, and then back to RGB... but that feels a little messy

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    Does this answer your question? Photoshop colour picker with only colours within the printable gamut? - the accepted answer should do what you want.
    – Billy Kerr
    Commented Mar 21, 2023 at 10:39
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    Another option is to set View > Proof Setup correctly for CMYK output, then choose View > Proof Colors this will display files as if they are CMYK, even though they are still RGB.
    – Scott
    Commented Mar 21, 2023 at 11:05
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    Have you asked them for a printer profile? They may not even be using 'straight' CMYK. High-end 'art' inkjets are 8-colour & can get a lot closer to sRGB than a standard separation process. I send a lot of photographic work to be done on canvases from sRGB files & I've stopped worrying the returned work won't be almost indistinguishable or at least within acceptable tolerance.
    – Tetsujin
    Commented Mar 21, 2023 at 11:06
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    ermm.. yeah I just assumed Photoshop for RGB.. dunno why :) I'd guess because RGB in Ai, for me, is strictly web stuff.
    – Scott
    Commented Mar 21, 2023 at 11:40
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    Illustrator does work, just a bit differently. Choose View > Proof Setup > Customize... and choose your CMYK profile of choice and click OK. This turns on the proof view by itself, you can turn off again with View > Proof Colors.
    – Vincent
    Commented Mar 21, 2023 at 11:49

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Summarizing comments...

One option with Photoshop is to set View > Proof Setup correctly for CMYK output, then choose View > Proof Colors this will display files as if they are CMYK, even though they are still RGB. It's does not alter the files, it merely changes how things are displayed.

One can also turn on the Gamut Warning in the View Menu in Photoshop.

For Illustrator (from @Vincent)

Illustrator works a bit differently. Choose View > Proof Setup > Customize... and choose your CMYK profile of choice and click OK. This turns on the proof view automatically, you can turn off the proof view with View > Proof Colors.

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