A few new IR images

[John Bower]

So Diane,

Does this mean that the other "RAW" shot that you posted, the one with the pastel blue colors was done with your custom white point?

Let me ask you this, do you get any tonal information in either the red or green channels (actually it would be in the green, cyan and yellow channels)? It looks like you may not be getting much at all. Therefore completely shooting my theory to bits... :-(

John Bower

 

[Diane B]

So Diane,

Does this mean that the other "RAW" shot that you posted, the one
with the pastel blue colors was done with your custom white point?

Let me ask you this, do you get any tonal information in either
the red or green channels (actually it would be in the green, cyan
and yellow channels)? It looks like you may not be getting much at
all. Therefore completely shooting my theory to bits... :-(

John Bower

If I understand what you are asking--you think that in the histogram, the red and green channels would be flat or limited to just some spiky areas?? They extend across most of the histogram, quite 'mountainous' in the center, less at black and white ends.

Yes,the pastel-y one was done with my custom white point. It is the converted tiff from my RAW. I did not do any editing in the RAW--as it came from camera (with my selected white point, as opposed to the auto in the 'red' image).

 

[John Bower]

So Diane,

Does this mean that the other "RAW" shot that you posted, the one
with the pastel blue colors was done with your custom white point?

Let me ask you this, do you get any tonal information in either
the red or green channels (actually it would be in the green, cyan
and yellow channels)? It looks like you may not be getting much at
all. Therefore completely shooting my theory to bits... :-(

John Bower

If I understand what you are asking--you think that in the
histogram, the red and green channels would be flat or limited to
just some spiky areas?? They extend across most of the histogram,
quite 'mountainous' in the center, less at black and white ends.

I should have said blue and green not red and green. So the histogram for the green channel isn't just flat, if you are to look at the green or blue channel, are you seeing a signal throughout range of the histogram?

I downloaded your samples and looked at the separate channels in Photoshop and the custom WB seems to have pretty similar histograms on each of the channels, this would seem to imply that once you do a custom WB, IR is getting through pretty evenly to all the channels. Whether this is enough to make a decent twain driver that would not interpolate would be another question.

John Bower