Mark Antony
Member
It emphasises red even during normal exposures, Kodak even tout this feature. There is no 'colour wheel' as such just a relationship between the three layers, Kodak have ensured the three records are kept pretty parallel over the normal exposure densities. The red is emphasised because of the structure of the dyes in the cyan layer being quite pure (they are vinyl colloids & synthetic) and sharper than old technology.
You can see this at all exposures because the dyes themselves govern the range of colour and the gamut. So it is entirely possible for films to emphasise blue or red and yet still be capable of neutral results under the right conditions.
The dyes aren't exposed 'askew' in relationship if you take a red rose on a grey b/g you can retain the neutral and have a saturated red, dyes are generated during development and the purity of the dye in the final image can be and is often down to the chemical make up of the coupler.
So you can emphasise reds while keeping neutrals and relationships tonally within an emulsion.
The way it works is the narrower the spectral peaks the purer the dyes, compare Portra and Ektar below:
You can see Ektar has narrower peaks (thus greater saturation) and also it shows nicely the extended red and the little peak in the red (650nm) this is why Ektar makes reds 'pop'
You can see this at all exposures because the dyes themselves govern the range of colour and the gamut. So it is entirely possible for films to emphasise blue or red and yet still be capable of neutral results under the right conditions.
The dyes aren't exposed 'askew' in relationship if you take a red rose on a grey b/g you can retain the neutral and have a saturated red, dyes are generated during development and the purity of the dye in the final image can be and is often down to the chemical make up of the coupler.
So you can emphasise reds while keeping neutrals and relationships tonally within an emulsion.

The way it works is the narrower the spectral peaks the purer the dyes, compare Portra and Ektar below:

You can see Ektar has narrower peaks (thus greater saturation) and also it shows nicely the extended red and the little peak in the red (650nm) this is why Ektar makes reds 'pop'
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