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Old 02-16-2012, 02:59 PM   #1
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Paper vs JetBookColor (in color and B&W mode)

JetBookColor owners, please we need your help:

We would like to see pictures of JetBookColor next to paper as shown in the thread indicated below:

http://www.mobileread.com/forums/sho...03&postcount=4

For JetBookColor we need two sets of pictures:
paper vs a PDF a in color mode
paper vs the same page in B&W

To simplify your work I will upload a PDF test page

thanks
PF

Here you can find test images to test all sort of color related settings
http://www.northlight-images.co.uk/a...st_images.html
Attached Thumbnails
Click image for larger version

Name:	PDI Test Image Gray scale.jpg
Views:	187
Size:	557.8 KB
ID:	82637   Click image for larger version

Name:	PDI Test Image.jpg
Views:	893
Size:	589.3 KB
ID:	82638  
Attached Files
File Type: pdf Grey scale test page.pdf (345.5 KB, 105 views)
File Type: pdf Color test page.pdf (359.7 KB, 108 views)

Last edited by PF4Mobile; 02-16-2012 at 07:25 PM.
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Old 02-17-2012, 06:14 AM   #2
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It does look a bit more colourful in real life than this, but this is after boosting the saturation and brightness of the original image before transferring to the jetBook...

Jpeg printed with colour laser printer vs jetBook Color:

Click image for larger version

Name:	paper.jpg
Views:	703
Size:	1.14 MB
ID:	82660

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Old 02-17-2012, 08:31 AM   #3
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Hi Andrew

Thanks for the pictures. The colors are OK.
I was wondering if you could print one of the attached images
The trick is to print on paper something that could cover the entire page and to see how much that gets rescaled on Jetbook (that should be for both B&W and color because by my understanding the ereader has different resolutions for the two modes)

In you case you seemed to have matched the size of the two. Looking at your pictures I would say that I can expect a full page color image to be reascaled seriously since there is around 25% of the paper left blank in order to match the size of the two renderings
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Old 02-17-2012, 02:46 PM   #4
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There is no Black and White mode on the Jetbook color. The only way to achieve black and white is to convert the original image to grayscale. Color is done with filters over the pixels and cannot be removed. See our wiki for details. People in this forum have constantly attempted to confuse this issue.

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Old 02-17-2012, 02:54 PM   #5
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There is no confusion. That was just a way to name the two different resolutions
Attached to my initial message you have two PDFs. Displaying them on JetBook Color should result in different images on the screen.
We would like to see those compared with their printed version of each PDF/JPG
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Old 02-19-2012, 08:23 AM   #6
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Quote:
Originally Posted by PF4Mobile View Post
JetBookColor owners, please we need your help:

We would like to see pictures of JetBookColor next to paper as shown in the thread indicated below:

http://www.mobileread.com/forums/sho...03&postcount=4

For JetBookColor we need two sets of pictures:
paper vs a PDF a in color mode
paper vs the same page in B&W

To simplify your work I will upload a PDF test page

thanks
PF

Here you can find test images to test all sort of color related settings
http://www.northlight-images.co.uk/a...st_images.html
Here's a black and white test - A4 paper printed on a b&w home laser printer vs the jetBook Color.

Click image for larger version

Name:	a4.jpg
Views:	208
Size:	1.36 MB
ID:	82741Click image for larger version

Name:	jetBook.jpg
Views:	214
Size:	1.05 MB
ID:	82742

Andrew
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Old 02-20-2012, 04:52 AM   #7
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To what I see, it seems like the jetbook has 256 B&W shades.
About on par with the kindle, or Sony reader e-ink devices!

On MobileRead the Jetbook was pretty active, a couple of weeks ago!
But we hardly hear now from anyone!

I hope they enable browsing, wifi, and keyboard support (USB HUB with mouse and keyb to attach to the device like it was a tablet)!
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Old 02-20-2012, 05:25 AM   #8
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To what I see, it seems like the jetbook has 256 B&W shades.
About on par with the kindle, or Sony reader e-ink devices!
...
I think it's actually only 16 shades of black/white/grey. Each colour (red, green and blue) sub-pixel has 16 shades giving 4096 colours, plus there's a pure black/grey/white sub-pixel in each group that also has 16 shades. See here for all the details: http://www.eink.com/sell_sheets/eink_brochure.pdf

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Old 02-20-2012, 10:06 AM   #9
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Attached is the file that was used for testing with M92
Please try this one. Use the second page of this document
I highlighted some text that should show use some interesting results
Attached Files
File Type: pdf vit .pdf (54.6 KB, 77 views)
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Old 02-20-2012, 10:37 AM   #10
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Quote:
Originally Posted by PF4Mobile View Post
Attached is the file that was used for testing with M92
Please try this one. Use the second page of this document
I highlighted some text that should show use some interesting results
OK, when I get a chance to take a photo in daylight. We just don't have enough artificial light in our house for decent photos for this purpose.

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Old 02-23-2012, 01:08 PM   #11
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Quote:
Originally Posted by DaleDe View Post
There is no Black and White mode on the Jetbook color. The only way to achieve black and white is to convert the original image to grayscale. Color is done with filters over the pixels and cannot be removed. See our wiki for details. People in this forum have constantly attempted to confuse this issue.

Dale
And there is no 1200x1600 resolution. The Triton layer over the eink screen turns down the resolution to 800x600.
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Old 02-23-2012, 01:35 PM   #12
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And there is no 1200x1600 resolution. The Triton layer over the eink screen turns down the resolution to 800x600.
Why are you going around this forum spreading misinformation? I hesitate to say lying - maybe you're genuinely mistaken.

Andrew
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Old 02-23-2012, 01:38 PM   #13
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Why are you going around this forum spreading misinformation? I hesitate to say lying - maybe you're genuinely mistaken.

Andrew
Please show us two identical screens. One in this B&W mode and one in color so we can see the difference in the resolution.
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Old 02-23-2012, 01:44 PM   #14
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Please show us two identical screens. One in this B&W mode and one in color so we can see the difference in the resolution.
Oh ffs...

There is no black and white mode or colour mode, just the one display. It has 1200x1600 sub-pixels clustered into fours for the colour. Displaying black and white uses all the sub-pixels independently. Displaying colours uses the clusters of four resulting in the 600x800 resolution for coloured stuff. I and others have explained this elsewhere, linked to reference material and I've posted a USB microscope shot at 400x mag showing two black lines crossing each other, each one only being one sub-pixel wide (therefore using the whole 1200x1600 resolution). What more do you want?

Andrew

Last edited by andyh2000; 02-23-2012 at 01:47 PM.
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Old 02-23-2012, 03:37 PM   #15
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A picture :-))

I hope you do realize that for a PDF like the last one that I uploaded here we should expect some "distortions" or irregularities in the rendering process. I can't understand how the model you explained above works when you mix colour and text.
That means that where you have B on W text you see a characters with rendered with different DPI that when you have coloured text.... so I do not think that for us who do not have the device is very easy to figure that out...
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