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?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Help: Pocketbook 302 display frozen	GotInk?	PocketBook	4	08-13-2010 06:58 AM
Pocketbook 302	Nate the great	News	12	05-17-2010 06:08 PM
Pocketbook 302	Klein Nijenhuis	PocketBook	1	05-16-2010 03:58 PM
Pocketbook 302	Forkosigan	PocketBook	165	02-18-2010 11:15 AM

09-12-2010, 03:07 PM	#2
wallcraft reader Posts: 6,977 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...

Advert

Advert