Also, just completely ignore CMYK unless you’re intending to print the image, CMYK is a colour profile intended for print, it’s the mixture of inks (C=cyan, M=Magenta, Y=Yellow, K=Key/Black) If you started an image as RGB, then converted to CMYK, then converted it back to RGB this could be the problem with why the colours are looking off. RGB has 16 million colours within it gamut, CMYK doesn’t have nearly this many colours (Realistically, it would be impractical for a printer to house 16 million different inks) So when you convert it from RGB > CMYK Photoshop will adjust the colours that are not within the CMYK colour gamut but once that process has happened there is no way of ‘retrieving’ that information back. E.G once you go CMYK you can’t then go back to RGB as the colour is lost. Well, you can go back to RGB of course but the colour is still lost. Also if it’s intended for the web, I would always recommend saving a PNG, as JPEG images compress some of the files information (without getting technical), so every time you save a JPEG, edit it, save JPEG, edit it and so on… you actually lose information and the image get worse and worse in quality. (I don’t suspect you’re doing this, just some advice to note)
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