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ishihara colour test prints

The  name of Dr. Shinobu Ishihara is known worldwide because of The Ishihara Colour Vision Charts which he established  in 1918. Even today, his test remains the one of choice throughout the world.  Dr. Ishihara developed a Japanese visual acuity chart and an apparatus for determining the near point, both still currently in wide use in Japan. He also made significant contributions to the study of trachoma and myopia.

 In 1908, Dr. Ishihara entered the postgraduate course in ophthalmology at the
Imperial  University of Tokyo, studying under Prof. Jujiro Komoto.  Subsequently, he studied in Germany under Professors Stock, Axenfeld and Hess. Dr Ishihara was appointed the Professor and Chairman, to succeed Prof. Komoto,  at the Ophthalmology Department of The Imperial University of Tokyo in 1922 and  served until March 1940.

 Dr. Ishihara had always led a very modest life, with no interest in material possessions. He was greatly revered by his students who, after his retirement,  built a cottage for him near a hot spring on the
Izu
Peninsula
. There he served as a country doctor, conducting clinics for his neighbours, asking no payment. As was the custom in those days, the patients left tokens of their gratitude in home-grown produce and small sums  of money. After covering his expenses, Dr. Ishihara returned all remaining money  to the villagers. These funds were used to build a library and a study room for the village children, a fitting tribute to the highly respected benefactor who came to live in their midst until his death in 1963.

The photographs below are C Y M K screen prints .

C=Cyan
Y=Yellow
M=Magenta
K=Black

Coloured jelly beans were used to mimic the colours of The Ishihara Test which I then photographed.
The image was then manipulated in Photoshop to produce the four screens needed for the C Y M K image.

The orange print is made up of c y m k and is a true representation of the original colours.
The green prints are made using only c y and k. Substituting one of them for the m in the print.
The grey prints are printed using different strengths of  grey instead of c y m k.

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