Yeah, it&#x27;s usually the latter - and when we do know it&#x27;s Adobe RGB we do exactly what you recommend, going via CIELAB - but it&#x27;s not precise, and clipping does occur.<p>We&#x27;re leaning towards &quot;please upload a valid image&quot; as a solution, which is a shame, but the whole perceptual end of things makes doing this automatically nigh on impossible - can&#x27;t come up with a solution that works for all cases.