Cleartrans Apr 3, 2009:

Agree With Tony. First place the checker in the subject plane, then make sure it has the right angle.

You might want to confirm we're talking about a colour checker here (99% chance). If you don't know what they look like: http://images.google.be/images?hl=nl&q=color checker&um=1&ie...

French Foodie (asker) Apr 3, 2009:

Super! Ok, thanks Tony. I just needed confirmation from someone familiar with the techniques that what I have makes sense. :-)

Tony M Apr 3, 2009:

It makes perfect sense In order to have results that are consistent from a colorimetric point of view (clearly one important factor when dealing with cosmetics), it is important that the reference test chart should not only be in the same plane as the subject to be photographed (both in terms of focus, and also being subject to exactly the same lighting conditions), but also be at the same angle (since colours/exposure may change according to the angle). These are perfectly standard techniques in photometry.

French Foodie (asker) Apr 3, 2009:

Thanks everyone. Christoph, just after this I have: Verifier l'inclinaison de la mire vis a vis du plan focal - which I have as "Verifier angle of checker with respect to focal plane". I think that is why I am having trouble determining the difference between that and "Placer la mire dans le plan de la zone a photographier." First you place the checker (dans le plan) and then you check the angle?

kashew Apr 2, 2009:

You are the expert: so, plane it is!

Cleartrans Apr 2, 2009:

Contrary to 'frame', 'plane' would indicate that angle is important. Besides, to a photographer 'frame' and 'zone à photographier' are more or less functionally the same.

kashew Apr 2, 2009:

Yes, colour checker (or simple target?).
Does "plane" allow for depth-of-field? So I go more for your idea of "frame".