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

The 505 displays 8 grey scales.

I mean the palette values ^_^

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

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?

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.

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

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

It is for JEComics color optimizzation filter ^_^

It is for JEComics color optimizzation filter ^_^
And that will work for regular photos too?

The only way to know is to try ^_^

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?

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.

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.

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.

Any new news in this arena? Specifically I want to be able to control TEXT color (i.e. shades of gray), as opposed to, say, pictures. According to the BBeB spec, there is a textcolor attribute - 4 bytes - alpha, red, green, blue. I have tried lots of combinations and all I get is black text. I can get the viewer on eBook Library (official Sony software) to do what I want. But not so with the PRS-505 itself. Similarly with the fontweight attribute. According to the spec, this should work. But I only get one weight of font on the actual reader.

I guess a better and more specific question is - Is there a PRS-505 technical spec that describes how it reacts to the various allowed features of the BBeB spec?

No specs at all, sorry (well, except the Xylog LRS one). Everything's been reverse engineered. And it's been a long time since I looked into the BBeB renderer...