Lab Colour Space versus AdobeRGB
Treat it like saving to JPG, once is absolutely fine, a few times you can get away with if the quality is high, but it should be kept to a minimum where possible.
but it does help
At least one retouch expert suggest copying the image to a new image, do the conversion, then paste the results as a new layer in the original image (this keeps the original untouched - which is important for retouch work).
Matt
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So the conclusions might be: we can convert from AdobeRGB to Lab Colour Spaceand back, but only once and only if necessary. The idea of doing it in a copy layer is always useful.
Most of the functionality in Photoshop is done behind the scenes in Lab mode. So conversions are likely being done anyway. (adjustment layers probably help minimize this a bit by performing a lot of the mods in an intelligent order... one would hope)
Although you probably don't want to do repetitive conversions for no reason, you're probably doing so to make changes to the image that will FAR outweigh any rounding errors that might be introduced from the Lab<->RGB conversion itself.
In general I wouldn't worry that much about it.
If you're doing a lot of mods, work in 16 bit mode. When you convert back to 8 bit for viewing/printing those rounding errors wont make a significant difference (unless your performing thousands of conversions)
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