Superia X-TRA 400 and Superia Premium 400 are both different films and are sold side by side here in Japan, theres a chart in some of the shops illustrating the difference
階調 translates as tone, 硬調 on the high side of the up/down scale means high contrast
色調 translates as colour tone.
So up is high contrast, down is low contrast, left is low saturation, right is high saturation.
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