Ive, I have the following suggestions for your online tutorial:

1) put the *Prerequisites* block at the top of the tutorial.

2) The command line option +E should be +FE (see Docs) in the tutorial 
and in all .pov files.

3) the *Quick Overview* block is a bit confusing as it mentions all kind 
of processes which are dealt with only later. I suggest to delete this 
block, or – better – to include it at the beginning of the *Some Hints* 
block.

4) In the *First Step* block, ColorChecker.pov does not render the shown 
image, strictly speaking. This is done by SpectralComposer.pov. I 
suggest to change the first paragraph to something like: “Render the 
file ColorChecker.pov animation. This will produce a series of 
grey-scale images of the GretagMacbeth(tm) ColorChecker Chart.”. Below, 
change the corresponding text: “...will create the final PNG image shown 
above. “

5) For better understanding just tell the user to uncomment #declare 
FName = "ColorChecker"; and to comment out #declare FName = 
"Diffraction"; That would be more comprehensive / less confusing.

Thomas

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