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Old 10-17-2007, 03:05 AM   #1
Kirys
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Cool PRS 505 gray shades?

Do someone have the gray shades values of the prs 505?
Thank you
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Old 10-17-2007, 03:45 AM   #2
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The 505 displays 8 grey scales.
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Old 10-17-2007, 03:52 AM   #3
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I mean the palette values ^_^
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Old 10-17-2007, 03:55 AM   #4
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I think that you can reasonably assume they are equally spaced from (0,0,0) to (255,255,255). ie multiples of 32.
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Old 10-17-2007, 04:20 AM   #5
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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?
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Old 10-17-2007, 04:32 AM   #6
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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.
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Old 10-17-2007, 04:45 AM   #7
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Smile

I'll try with it, well' see the results.
Thank you
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Old 10-17-2007, 10:08 PM   #8
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Old 10-18-2007, 01:29 AM   #9
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It is for JEComics color optimizzation filter ^_^
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Old 10-18-2007, 02:47 AM   #10
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It is for JEComics color optimizzation filter ^_^
And that will work for regular photos too?
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Old 10-18-2007, 03:09 AM   #11
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The only way to know is to try ^_^
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Old 10-18-2007, 03:28 AM   #12
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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?
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Old 10-18-2007, 03:36 AM   #13
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Cool

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.
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Old 10-18-2007, 03:40 AM   #14
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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.
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Old 10-21-2007, 04:58 PM   #15
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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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