PRS 505 gray shades?

Kirys · 10-17-2007, 02:05 AM

Do someone have the gray shades values of the prs 505?
Thank you

HarryT · 10-17-2007, 02:45 AM

The 505 displays 8 grey scales.

Kirys · 10-17-2007, 02:52 AM

I mean the palette values ^_^

HarryT · 10-17-2007, 02:55 AM

I think that you can reasonably assume they are equally spaced from (0,0,0) to (255,255,255). ie multiples of 32.

Kirys · 10-17-2007, 03:20 AM

I was thinking so, but i don't know if i have to count 0 or not ^_^
counting from 0 (to 255) i would be a spacing of about 36.5 (with 32 i'll get 9 shades if i count 0)
so rounding 36.5 to 36 (I do hate odd numbers ^_^)
it would be
0,24,48,6c,90,b4,d8,fc (or ff...)

What you think?

HarryT · 10-17-2007, 03:32 AM

Oh yes, I see what you mean - you have to include both "Black" and ""White" in the count of 8 don't you, so that leaves 6 intermediate values.

Yes, I'd agree with your calculations - you certainly aren't going to be very far out, anyway.

Kirys · 10-17-2007, 03:45 AM

I'll try with it, well' see the results.
Thank you

JSWolf · 10-17-2007, 09:08 PM

What is it you want to know for? Inquiring minds want to know.

Kirys · 10-18-2007, 12:29 AM

It is for JEComics color optimizzation filter ^_^

JSWolf · 10-18-2007, 01:47 AM

Quote:

Originally Posted by Kirys

It is for JEComics color optimizzation filter ^_^

And that will work for regular photos too?

Kirys · 10-18-2007, 02:09 AM

The only way to know is to try ^_^

JSWolf · 10-18-2007, 02:28 AM

One other question...How will this make the images better to view on the 505 then just letting the 505 do the dithering from the original image?

Kirys · 10-18-2007, 02:36 AM

the idea is that a desktop pc have more power than the prs and could use more complex dithering and scaling algorithms.
The second reason is file size, resizing and reducing color depth means smaller size with the same or better output on the device.

JSWolf · 10-18-2007, 02:40 AM

Quote:

Originally Posted by Kirys

the idea is that a desktop pc have more power than the prs and could use more complex dithering and scaling algorithms.
The second reason is file size, resizing and reducing color depth means smaller size with the same or better output on the device.

I'll be interested in trying this new version once it is ready to go.

linguist · 10-21-2007, 03:58 PM

One source I saw this week (not at hand) referred to a "2-gray-scale mode" on the 505 as an alternative setting, but of course I see nothing like this in the menu.

I was attracted by this, because as I read PDF files on my 505, I notice that the background white is actually one tiny shade off the "true" white of the reader - which is still visible in a strip around the perimeter. Setting the machine for 2 gray scales would solve this problem, it seems to me, and restore the crackle to those PDF pages.

This comes up with every PDF I read, and is a problem absent from other formats on the machine.

10-17-2007, 02:05 AM	#1
Kirys Zealot Posts: 122 Karma: 86 Join Date: Dec 2006 Location: Italy Device: Boox M90	PRS 505 gray shades? Do someone have the gray shades values of the prs 505? Thank you

10-21-2007, 03:58 PM	#15
linguist Member Posts: 14 Karma: 24 Join Date: Oct 2007 Device: sony 505	2-gray-scale setting on the 505? One source I saw this week (not at hand) referred to a "2-gray-scale mode" on the 505 as an alternative setting, but of course I see nothing like this in the menu. I was attracted by this, because as I read PDF files on my 505, I notice that the background white is actually one tiny shade off the "true" white of the reader - which is still visible in a strip around the perimeter. Setting the machine for 2 gray scales would solve this problem, it seems to me, and restore the crackle to those PDF pages. This comes up with every PDF I read, and is a problem absent from other formats on the machine.

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10-17-2007, 02:45 AM	#2
HarryT eBook Enthusiast Posts: 85,544 Karma: 93383043 Join Date: Nov 2006 Location: UK Device: Kindle Oasis 2, iPad Pro 10.5", iPhone 6	The 505 displays 8 grey scales.

10-17-2007, 02:52 AM	#3
Kirys Zealot Posts: 122 Karma: 86 Join Date: Dec 2006 Location: Italy Device: Boox M90	I mean the palette values ^_^

10-17-2007, 02:55 AM	#4
HarryT eBook Enthusiast Posts: 85,544 Karma: 93383043 Join Date: Nov 2006 Location: UK Device: Kindle Oasis 2, iPad Pro 10.5", iPhone 6	I think that you can reasonably assume they are equally spaced from (0,0,0) to (255,255,255). ie multiples of 32.

10-17-2007, 03:20 AM	#5
Kirys Zealot Posts: 122 Karma: 86 Join Date: Dec 2006 Location: Italy Device: Boox M90	I was thinking so, but i don't know if i have to count 0 or not ^_^ counting from 0 (to 255) i would be a spacing of about 36.5 (with 32 i'll get 9 shades if i count 0) so rounding 36.5 to 36 (I do hate odd numbers ^_^) it would be 0,24,48,6c,90,b4,d8,fc (or ff...) What you think?

10-17-2007, 03:32 AM	#6
HarryT eBook Enthusiast Posts: 85,544 Karma: 93383043 Join Date: Nov 2006 Location: UK Device: Kindle Oasis 2, iPad Pro 10.5", iPhone 6	Oh yes, I see what you mean - you have to include both "Black" and ""White" in the count of 8 don't you, so that leaves 6 intermediate values. Yes, I'd agree with your calculations - you certainly aren't going to be very far out, anyway.

10-17-2007, 03:45 AM	#7
Kirys Zealot Posts: 122 Karma: 86 Join Date: Dec 2006 Location: Italy Device: Boox M90	I'll try with it, well' see the results. Thank you

10-17-2007, 09:08 PM	#8
JSWolf Resident Curmudgeon Posts: 73,897 Karma: 128597114 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	What is it you want to know for? Inquiring minds want to know.

10-18-2007, 12:29 AM	#9
Kirys Zealot Posts: 122 Karma: 86 Join Date: Dec 2006 Location: Italy Device: Boox M90	It is for JEComics color optimizzation filter ^_^

10-18-2007, 02:09 AM	#11
Kirys Zealot Posts: 122 Karma: 86 Join Date: Dec 2006 Location: Italy Device: Boox M90	The only way to know is to try ^_^

10-18-2007, 02:28 AM	#12
JSWolf Resident Curmudgeon Posts: 73,897 Karma: 128597114 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	One other question...How will this make the images better to view on the 505 then just letting the 505 do the dithering from the original image?

10-18-2007, 02:36 AM	#13
Kirys Zealot Posts: 122 Karma: 86 Join Date: Dec 2006 Location: Italy Device: Boox M90	the idea is that a desktop pc have more power than the prs and could use more complex dithering and scaling algorithms. The second reason is file size, resizing and reducing color depth means smaller size with the same or better output on the device.