09-21-2013, 12:42 PM | #1 |
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Typegenius "Sharpness"
Kobo's "Typegenius" feature (accessible if you select "Advanced" next to a font name) lets you adjust "Weight" and "Sharpness."
I get what "Weight" does -- it makes the characters bolder -- and can clearly see the difference as I adjust the slider. But I don't understand what "Sharpness" does. I can't see a visible difference on my Kobo Glo (although I have aging eyes, so that shouldn't be taken to mean that there is no difference). What, precisely, does Sharpness adjust? What does it change on a per-pixel basis? Thanks! |
09-21-2013, 01:29 PM | #2 |
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I think it refers to anti-aliasing, or the addition of grey pixels surrounding the sharp edges of the font. Sharper would mean less anti-aliasing. The effect could be invisible if the DPI is high enough or if you hold the device far enough away, or if your eyesight is not sharp enough to see pixels.
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09-21-2013, 06:14 PM | #3 | |
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You can check Wikipedia for more on subpixel rendering and other anti-aliasing techniques. One quick link is http://en.wikipedia.org/wiki/Font_rasterization. Regards, David |
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09-23-2013, 05:15 PM | #4 | |
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At the maximum level, that halo is gone. Edges will be sharp black/white. |
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09-24-2013, 04:09 AM | #5 |
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So is it correct that it is faster to render fonts with higher sharpness? If so, and if I can't tell the difference between maximum and minimum sharpness, then I may as well just set it to maximum.
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09-24-2013, 11:48 AM | #6 |
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The amount of sharpness effect you'll see depends on the font you're using.
It's based on how the human eye perceives sharpness. When something looks blurry or out-of-focus to you, it's because the lines and edges are fuzzy, spread out in space and blending into each other. When something looks sharp, it's because there's high contrast at the lines and edges, changing quickly from dark to light (or vice-versa) instead of blending gradually. So to make something appear artificially "sharper" to your eyes, they simply increase the contrast of lines and edges, often exaggerating them to the point where there's a bright line on one side of the edge and a dark line on the other side. On the eInk screen it's a little bit more limited. All they can do is reduce or remove the grey blending pixels used for anti-aliasing the font. |
09-24-2013, 04:16 PM | #8 | |
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regards Jack |
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09-24-2013, 04:17 PM | #9 |
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Thank you, everybody!
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