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Old 09-12-2010, 01:28 PM   #1
Crutiatix
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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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Old 09-12-2010, 03:07 PM   #2
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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.
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Old 09-12-2010, 10:42 PM   #3
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yes exactly. try the test image from that thread

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Old 09-13-2010, 01:23 PM   #4
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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. :/
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Old 09-13-2010, 01:51 PM   #5
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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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