[argyllcms] Re: How can I tell if I'm using my profile? (and other questions)

Graeme Gill wrote:

Florian Höch wrote:
Just for the sake of completeness: Regardless of what gamma you end up calibrating your monitor to, and assumed that sRGB images should be viewed with a gamma of (say) 2.4 instead of with sRGB curve, then in a colormanaged workflow you'd actually have to discard the embedded sRGB profile from the image, and embed a profile with the same primaries but a gamma of 2.4 (I hope this is not too confusing, I myself start to get a bit dizzy at the moment ;)) 

In a color managed workflow, the transformation from the image profile
to the display profile should properly take into account the viewing
conditions. If it does so, then it will make a similar viewing transform
to that of displaying a 2.2 gamma source on a 2.4 gamma destination.
This can be accomplished using Argyll tools by using the viewing conditions parameters when creating profiles and/or device links (-c and -d parameters). 



Note that the (theoretical) correct way of setting up a display to be
calibrated to sRGB, is to select sRGB as a target in dispcal, but ensure
that the ambient light correction is used (either by measuring the
ambient light with your instrument (if it is capable of it), or
estimating your ambient level, and feeding it in via the -a argument)
I'm not sure, but I suspect my device is not able to read the ambient light level. (How can I tell for sure?) Is there some resource I can use to estimate it? (e.g. I have the room illuminated by one 19 W fluorescent bulb, the room has certain dimensions, and there is one window..... Light level is of course different at noon than at midnight, but I might have a night profile and a day profile, I suppose.) What assumption about ambient light level is the default? (Or what assumption is built in if you don't add a correction?)

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