https://forums.adobe.com/people/rob+day wrote No Engine, Intent, and Black Point Compensation has been used, because there is nothing to convert. With the current versions there is a conversion because the Pantone libraries are defined as Lab in both apps, so there's going to be a color managed conversion from Lab to CMYK, and the Color Intent as well as the destination CMYK profile will come into play. Lab color has no profile because it is and abstract color space, which is device independent. I meant there is no CMYK conversion from one color space to another. That conversion from Lab to CMYK you are indicating is handled in both InDesign and Photoshop by the same Color Settings and thus any variable (intent, black point, etc) is the same. I have repeated your experiment with the same Pantones you suggested and yes: they do match. But then I repeated with my Pantones: 7701C and 362C. Seems to me that you are getting a match, but are not allowing for Photoshop's rounding. I won't call this a match, Rob. The difference between values might be low and not to be perceived by the human eye once printed, but exist and is enough to be noticed on screen. However, accurate color conversion has been an issue with Adobe software for ages - same problems arise with Illustrator. This have improved greatly since Pantone works with Lab, but still anyone can encounter this kind of situations. Instead of suggesting to move into 32-bits and back to 8 (quite an annoyance), I would suggest any user reading this topic just to be careful, measure color difference, assess the difference (is it really significant?), and allow a bit of divergence if the document intent is print and you're going from Pantone to CMYK. I would also like to thank you for your kind and helpful responses and indications.
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