Hi Graeme,I'll take the lack of interest as a "get a life" reply? :)Hi,
Typically no reply means that you've asked a questions to which
it's difficult to frame a useful response.
Sorry - what exactly are you asking ? - it's not clear. i.e. what are you expecting here that's different from what you are getting ? Note that there is nothing magical about a step wedge - i.e. there is no reason to think that every step of some wedge should be visible when correctly calibrated, since visibility depends on the step size and the target curve shape. A sufficiently high pure gamma curve on top of a high black offset + 256 step wedge will be expected to have several steps that are not visibly different.
for example of a case where the first steps are expected
to be invisible.
So the best way would be to measure your step levels and compare to the expected
value, to assure yourself that the calibration is sufficiently accurate
your instrument is capable of the necessary accuracy). Easiest approach would
probably be to run a verification chart with the step wedge values as the
[ You could do this one step at a time using ColorMeter too. ]