Touch Kobo Touch is less sharp and less dark

eggzorcist · 07-31-2011, 10:50 AM

Is it normal that whenever I turn the pages, the text become less sharp and less dark until refresh?

SF&F Reader · 07-31-2011, 11:40 AM

Yes, unfortunately. It is less noticeable with some fonts, I think. If it bothers you, try decreasing the number of page turns before refresh.

Also, is your Kobo up-to-date? I think it has improved somewhat with the firmware updates.

Joe563 · 07-31-2011, 11:40 AM

Yes, that is normal unless you set the page refresh rate to 1 page. i.e. tap middle of screen then select Options Menu>Advanced Settings

the.Mtn.Man · 07-31-2011, 02:16 PM

Frankly, I can't think of any reason why you wouldn't want the screen to refresh with every page turn.

SF&F Reader · 07-31-2011, 02:49 PM

Battery life.

I have mine set to refresh every 6 turns. It doesn't bother me at all while reading either way.

Different fonts work differently of course. I have one where the letters are fairly thick. Some people use perma-bold font.

DizzC · 07-31-2011, 03:48 PM

Quote:

Originally Posted by the.Mtn.Man

Frankly, I can't think of any reason why you wouldn't want the screen to refresh with every page turn.

I imagine its because the black flash is distracting to some. I have mine set to refresh every 3 pages and I barely even notice it unless I'm reading outside in the sun. For whatever reason I seem to notice the page refresh a lot more when I'm outdoors.

SCION · 07-31-2011, 04:00 PM

Quote:

Originally Posted by SF&F Reader

Battery life.

I have mine set to refresh every 6 turns. It doesn't bother me at all while reading either way.

Different fonts work differently of course. I have one where the letters are fairly thick. Some people use perma-bold font.

Yes, mine is set to 6 pages as well. Using a bold font.

JD Gumby · 07-31-2011, 05:20 PM

Quote:

Originally Posted by the.Mtn.Man

Frankly, I can't think of any reason why you wouldn't want the screen to refresh with every page turn.

Because the flashing black of the full-screen refresh is *VERY* irritating when it happens on every page (which is why I got the Touch rather than the Wi-Fi - that feature alone is worth much of the extra $30...).

the.Mtn.Man · 07-31-2011, 07:34 PM

Quote:

Originally Posted by SF&F Reader

Battery life.

I can't imagine a full screen refresh uses significantly more battery power than a partial screen refresh.

----------

Quote:

Originally Posted by JD Gumby

Because the flashing black of the full-screen refresh is *VERY* irritating when it happens on every page (which is why I got the Touch rather than the Wi-Fi - that feature alone is worth much of the extra $30...).

Curious. I don't find the full screen refresh any more visually distracting than turning the page of an actual book, and since it happens regularly and predictably, I've found that my mind effectively blanks it out and I don't even consciously notice it. I actually find a refresh after every X pages more distracting because it becomes an anomaly.

Pistos · 07-31-2011, 07:47 PM

Quote:

Originally Posted by the.Mtn.Man

I can't imagine a full screen refresh uses significantly more battery power than a partial screen refresh.

I'm no expert on the matter, but my guess is that it is simply because it takes power to change the shade of a pixel. When the Kobo doesn't do a full refresh, it only "clears" the necessary pixels, leaves alone the necessary pixels, and then darkens the necessary pixels for the text of the new page. That is always fewer pixel flips than shading the whole screen, then clearing out the pixels to show the text of the new page.

the.Mtn.Man · 07-31-2011, 08:51 PM

Quote:

Originally Posted by Pistos

I'm no expert on the matter, but my guess is that it is simply because it takes power to change the shade of a pixel. When the Kobo doesn't do a full refresh, it only "clears" the necessary pixels, leaves alone the necessary pixels, and then darkens the necessary pixels for the text of the new page. That is always fewer pixel flips than shading the whole screen, then clearing out the pixels to show the text of the new page.

Yes, it no doubt uses less energy, but I can't imagine the difference is substantial.

Pistos · 07-31-2011, 10:29 PM

Well, it's probably in the ballpark of 50% savings per page, or even better, because a full page "wipe" would at least flip the pixels of the space between lines and between letters, and also the entire margin all around the page. All those pixel changes wouldn't happen with the non-refresh page turn.

the.Mtn.Man · 08-01-2011, 07:13 AM

Well whatever the difference is, it's well worth it in my opinion to have sharp, ghost-free text page after page.

TedJ · 08-01-2011, 07:20 AM

There is a reduction in power consumption with partial refreshes, but it's not significant. I believe the primary reason for using it is page turn speed.

danskmacabre · 08-01-2011, 07:55 AM

I have it refresh every 6 pages.
I do see some ghosting if I look reall yclose, but when just reading, it causes no problems, so I've just left it at every 6 pages, which I believe is the default.

07-31-2011, 10:50 AM	#1
eggzorcist Junior Member Posts: 1 Karma: 10 Join Date: Jul 2011 Device: Kobo Touch	Kobo Touch is less sharp and less dark Is it normal that whenever I turn the pages, the text become less sharp and less dark until refresh?

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07-31-2011, 11:40 AM	#2
SF&F Reader Groupie Posts: 150 Karma: 100855 Join Date: Jun 2011 Location: Saskatchewan, Canada Device: Kobo Touch, Blackberry Playbook, Samsung Galaxy SII HD LTE	Yes, unfortunately. It is less noticeable with some fonts, I think. If it bothers you, try decreasing the number of page turns before refresh. Also, is your Kobo up-to-date? I think it has improved somewhat with the firmware updates.

07-31-2011, 11:40 AM	#3
Joe563 Never spit into the wind. Posts: 328 Karma: 23499 Join Date: Jun 2011 Location: New Westminster, BC Device: Kobo Original, Kobo Touch, Kobo Android(smartphone & tablet)	Yes, that is normal unless you set the page refresh rate to 1 page. i.e. tap middle of screen then select Options Menu>Advanced Settings

07-31-2011, 02:16 PM	#4
the.Mtn.Man Guru Posts: 710 Karma: 2483502 Join Date: Jul 2011 Device: Kobo Aura	Frankly, I can't think of any reason why you wouldn't want the screen to refresh with every page turn.

07-31-2011, 02:49 PM	#5
SF&F Reader Groupie Posts: 150 Karma: 100855 Join Date: Jun 2011 Location: Saskatchewan, Canada Device: Kobo Touch, Blackberry Playbook, Samsung Galaxy SII HD LTE	Battery life. I have mine set to refresh every 6 turns. It doesn't bother me at all while reading either way. Different fonts work differently of course. I have one where the letters are fairly thick. Some people use perma-bold font.

07-31-2011, 10:29 PM	#12
Pistos Connoisseur Posts: 95 Karma: 3198 Join Date: Jul 2011 Location: Canada Device: Kobo Touch	Well, it's probably in the ballpark of 50% savings per page, or even better, because a full page "wipe" would at least flip the pixels of the space between lines and between letters, and also the entire margin all around the page. All those pixel changes wouldn't happen with the non-refresh page turn.

08-01-2011, 07:13 AM	#13
the.Mtn.Man Guru Posts: 710 Karma: 2483502 Join Date: Jul 2011 Device: Kobo Aura	Well whatever the difference is, it's well worth it in my opinion to have sharp, ghost-free text page after page.

08-01-2011, 07:20 AM	#14
TedJ Groupie Posts: 189 Karma: 86778 Join Date: Jun 2011 Location: Brisbane, Australia Device: Kobo Touch	There is a reduction in power consumption with partial refreshes, but it's not significant. I believe the primary reason for using it is page turn speed.

08-01-2011, 07:55 AM	#15
danskmacabre Guru Posts: 733 Karma: 3593438 Join Date: Jun 2011 Location: Australia Device: Kobo Glo. Galaxy Tab S 8.4	I have it refresh every 6 pages. I do see some ghosting if I look reall yclose, but when just reading, it causes no problems, so I've just left it at every 6 pages, which I believe is the default.

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