Roger Breton wrote:
Just to make sure I follow the arguments here, is the adaptation required strictly when the colorimetry of the measurements is calculated for something *other* than D50? Let's say I measure the color patches using D50/2 then, there is no adaptation required, right? But if I measure the color patches using A/2 or D65/2 then, what I understand the v4 spec says is that the media white still needs to be encoded in D50/2. Therefore, the only way to go from A/2 or D65/2, for instance, to D50/2 is through a chromatic adaptation like Bradford.
Yes, this seems to be the case. Argyll is still pre-V4, and pre-V4 didn't really have a way of dealing with profiles intended for non-D50 environments (apart from simply discarding this information).
I'm not convinced that this is much of a problem though. Under what circumstances does one deliberately create a profile with absolute measurements made under non-D50, and then want to use the profile in absolute mode as if it had been measured under D50 ? Why not simply create a profile that has absolute mode that has been measured under D50, if that's how you want to use it ?
Graeme Gill.
