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Originally Posted by ottischwenk
The contrast percentage remains the same, only the brightness is reduced.
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For a reflective display such as an eInk or paper, contrast ratio is the ratio between the reflectance of the lightest white and the darkest black. If the screen's closest approach to white is a mid-grey, it's not going to have the contrast ratio of a screen with a lighter grey white assuming that both have the same black reflectance.
Quote:
Originally Posted by ottischwenk
By using the lighting, the brightness is increased and the contrast of Carta 1200 is reached again in values.
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An interesting theory. Sadly contrary to physical reality. You are getting more light from the frontlight but you would also get more light by holding the screen closer to any light source. This does not affect the ratio between the darkest and lightest parts of the screen.
Quote:
Originally Posted by ottischwenk
In addition, the Boox Tab devices have a multiple screen speed compared to the Galery 3 devices and are also superior to the rest of the "Einks".
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Kaleido 3 is a B&W display with a colour filter array so it can have the same frame rate as any other same generation B&W display. Sadly, the Kaleido 3 has a contrast ration of 10 and a colour gamut of 4096. So basically, muted comic book colours at best. Since Gallery 3 uses 4 colour particles in a single cup, it does take more time to move the cyan, magenta, yellow and white particles into place though when using B&W, the speed is a respectable (for eInk display) 350ms. OTOH, this means that a 300DPI display is a 300DPI colour display in comparison to the Kaleido 3's 150DPI colour.
I sadly was unimpressed by a Onyx Boox Tab Ultra C attempting to display an animation. As near as I could tell, it was using an old mode reverting to black or white for each pixel in comparison to the 16 shades of grey normally used. This results in a massive 8 colours at ~6FPS.