"Apple processing" with OpenCV3 + Python3
There seems to be an image filter called "Apple processing", so I imitated it with OpenCV + Python.
It is also called a simple hue (H) extraction filter. It looks lighter than the original image, probably because the complementary colors are gone. It may be better to play with the saturation (S) additionally.
Converted image:
Original image (Image exhibit):
Source: https://gist.github.com/yohhoy/4f762ccf7c7a0bfcccfe
$ curl https://upload.wikimedia.org/wikipedia/commons/0/0b/ItsukushimaTorii7396.jpg > download.jpg
$ convert -resize 400 download.jpg image1.jpg
$ ./redgray.py image1.jpg output1.jpg
(The convert command is provided by ImageMagick)
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