Pocketbook 302 display only 4 color ?

Crutiatix · 09-12-2010, 01:28 PM

Hi,
I noticed, that my e-book reader to display images instead of the sixteen color display only four. I checked it with various images of the crossings, but always display four colors, black screen, crossing of four colors, or a small icon.In the description of this e-book reader is written, that can display 16 colors in grayscale.
What is your experience with this?

wallcraft · 09-12-2010, 03:07 PM

The original PocketBook readers only supported 4 greyscales in hardware, but (like most EInk devices) they used dithering to increase the effective greyscale range. PocketBook claims that the 302 has 16 greyscales - but then they previously claimed that devices with 4 hardware greyscales also had 16 greyscales.

If an image only contains 4 grey levels, then that is all you will get. See More display issues on the DR for some images and ebooks to use for testing.

Dulin's Books · 09-12-2010, 10:42 PM

yes exactly. try the test image from that thread

Crutiatix · 09-13-2010, 01:23 PM

Thus, images with four colors display only in "Boot Logo" and "Power-off logo. In addition to these two cases, the images displayed correctly.
For a few hours i will add some photos.
All my batteries to camera are discharged. :/

sobukus · 09-13-2010, 01:51 PM

I am wondering about this, too, with my Pocketbook 360. Comparing some artwork in epub / HTML books between iRex DR 1000 and the PB clearly suggests that this is 4 color vs. 16 color rendering.
The example photos supplied with the machine also don't look like 16 color dithered display (there's a picture of a white swan ... not much structure to see).

I loaded a certain picture on the laptop and converted to 4 / 16 color dithered grayscale and thusly reproduced quite nicely what the two readers do. So I wonder, too: Can the Pocketbook hardware do 16 gray levels or not?

It wouldn't be a total deal breaker; for pretty graphics at proper scale the DR 1000 is much nicer anyway (though it totally loses on portability / power management); but nevertheless, the product info could be considered misleading...

09-12-2010, 01:28 PM	#1
Crutiatix Junior Member Posts: 3 Karma: 10 Join Date: Sep 2010 Device: Pocketbook 302	Pocketbook 302 display only 4 color ? Hi, I noticed, that my e-book reader to display images instead of the sixteen color display only four. I checked it with various images of the crossings, but always display four colors, black screen, crossing of four colors, or a small icon.In the description of this e-book reader is written, that can display 16 colors in grayscale. What is your experience with this?

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09-12-2010, 03:07 PM	#2
wallcraft reader Posts: 6,975 Karma: 5183568 Join Date: Mar 2006 Location: Mississippi, USA Device: Kindle 3, Kobo Glo HD	The original PocketBook readers only supported 4 greyscales in hardware, but (like most EInk devices) they used dithering to increase the effective greyscale range. PocketBook claims that the 302 has 16 greyscales - but then they previously claimed that devices with 4 hardware greyscales also had 16 greyscales. If an image only contains 4 grey levels, then that is all you will get. See More display issues on the DR for some images and ebooks to use for testing.

09-12-2010, 10:42 PM	#3
Dulin's Books Wizard Posts: 2,806 Karma: 13500000 Join Date: Nov 2009 Location: Portland, OR Device: Boox PB360 etc etc etc	yes exactly. try the test image from that thread

09-13-2010, 01:23 PM	#4
Crutiatix Junior Member Posts: 3 Karma: 10 Join Date: Sep 2010 Device: Pocketbook 302	Thus, images with four colors display only in "Boot Logo" and "Power-off logo. In addition to these two cases, the images displayed correctly. For a few hours i will add some photos. All my batteries to camera are discharged. :/

09-13-2010, 01:51 PM	#5
sobukus Junior Member Posts: 9 Karma: 10 Join Date: Sep 2010 Location: Germany Device: 2 lBook v3 (dead), DR 1000, PB 360 (dead), Bebook mini, Onyx M92 (...)	I am wondering about this, too, with my Pocketbook 360. Comparing some artwork in epub / HTML books between iRex DR 1000 and the PB clearly suggests that this is 4 color vs. 16 color rendering. The example photos supplied with the machine also don't look like 16 color dithered display (there's a picture of a white swan ... not much structure to see). I loaded a certain picture on the laptop and converted to 4 / 16 color dithered grayscale and thusly reproduced quite nicely what the two readers do. So I wonder, too: Can the Pocketbook hardware do 16 gray levels or not? It wouldn't be a total deal breaker; for pretty graphics at proper scale the DR 1000 is much nicer anyway (though it totally loses on portability / power management); but nevertheless, the product info could be considered misleading...

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