MobileRead Forums - View Single Post - Color E-Paper not without problems

kacir · 05-08-2009, 05:33 AM

I do not understand.

With monitors you ADD green, blue, red LIGHT to achieve colors. Funny thing is, that 100% red + 100% blue + 100% green do not give you white light. It is just our eye that perceives it as white light.
see http://en.wikipedia.org/wiki/RGB

When printing on papers, instead of adding light, you SUBTRACT. That is why a color printer uses Cyan, Magenta and Yellow ink to mix ink dots on paper and achieve colors. Most often CMYK is used, adding blacK, so you so not use 100%C + 100%M + 100%Y, but instead you only use 100%K.
see http://en.wikipedia.org/wiki/CMYK

Elektrophoretic displays http://en.wikipedia.org/wiki/Electrophoretic_display do not mix light. They work more like paper. So I would expect, that instead of RGB pixels they would mix CMY(K) colors.

05-08-2009, 05:33 AM	#3
kacir Wizard Posts: 3,463 Karma: 10684861 Join Date: May 2006 Device: PocketBook 360, before it was Sony Reader, cassiopeia A-20	I do not understand. With monitors you ADD green, blue, red LIGHT to achieve colors. Funny thing is, that 100% red + 100% blue + 100% green do not give you white light. It is just our eye that perceives it as white light. see http://en.wikipedia.org/wiki/RGB When printing on papers, instead of adding light, you SUBTRACT. That is why a color printer uses Cyan, Magenta and Yellow ink to mix ink dots on paper and achieve colors. Most often CMYK is used, adding blacK, so you so not use 100%C + 100%M + 100%Y, but instead you only use 100%K. see http://en.wikipedia.org/wiki/CMYK Elektrophoretic displays http://en.wikipedia.org/wiki/Electrophoretic_display do not mix light. They work more like paper. So I would expect, that instead of RGB pixels they would mix CMY(K) colors.