Has anyone ever thought about reproducing the X-Rite color checker passport as a transparency, or a negative so you could profile your backlight source?
I think it would be helpful for:
Transparency Capture: Including slides, medium, and large format. This would give you the ability to capture the slide base including any discoloration due to age of the acetate. Then you’d have a duplicate of the absolute original before any corrections are applied in LR.
Negative Capture: Ditto here but now you’d have an accurate profile to apply to the negative stock. Maybe this could make conversions more consistent and help NLP do it’s thing better.
I don’t know of anyone who has tried doing this. I think the problem might be that no one I know owns a densitometer to read the white point of a transparency or a negative. I suppose the late it would be processed at would have one but then we’re also talking about testing color filtration over the lens of a film camera.
Has anyone else thought about this?
Here is a page on X-Rites website that shows what the white patch (#19) color build should be. https://xritephoto.com/ph_product_overview.aspx?ID=2572&Action=Support&SupportID=5159