(keitai-l) Re: AU/KDDI Phones and headers

i can answer one of these:

RGB565 is a way of encoding colors for a display device.
where there are 5 bits of red, 6 bits of green, and 5 bits of blue.
so, for red there are 32 levels (00000 to 11111 binary).
why are there 6 for green?
well, two reasons come to mind:  since 16 doesn't divide nicely by 3,
the extra bit should be used somewhere.
and, green is the color that the eye is most sensitive to.

same idea for RGB332.

although, i shouldn't guess what the UP browser is doing with these,
generally, this encoding is not visible to the content developer, but
has implications in how good various kinds of color images will look
on the display.

-rolf

> From: "Ankit Bal" <ankit@eyesmaxsoftware.com>
> Subject: AU/KDDI  Phones and headers
> Date: Thu, 24 Jan 2002 16:38:06 +0530
> 
> 
> Hi all,
>     I need some clarifications of AU headers.
>     I have been analysing the headers for AU phones for quite some in the logs o
> f our site. Fortunately we can associate the device IDs send by user-agent troug
> h the codes at http://wap.ssi-n.com/pc/browser.html .
> 
>    The following list of headers were sent by most phones, but I was unable to g
> et explanations for some.
> 
> 1. user-agent : 
>         UP.Browser/[Browser_version like 3.04]-KC13 UP.Link/[uplink-version like
>  3.4.4] where KC13 is the device ID, or "KDDI-TS21 UP.Browser/6.0.2.276 (GUI) MM
> P/1.1" this type is only for GUI phones.
> 2. x-up-devcap-iscolor : 0 or 1
> 3. x-up-devcap-max-pdu : Maximum packet size supported. Is this the maximum size
>  of the page that can be sent to the phone?
> 4. x-up-devcap-multimedia : 0222321100000000 ? what does this mean
> 5. x-up-devcap-numsoftkeys : number of softkeys supported.
> 6. x-up-devcap-screenchars : number of chars that can fit in width and height li
> ke 24, 9
> 7. x-up-devcap-screendepth : for B/W it is 1, for color 16,RGB565 or 8,RGB332 wh
> at is RGB565 or RGB332?
> 8. x-up-devcap-screenpixels : width x height of screen in pixels.
> 9. x-up-devcap-softkeysize : Number of chars allowed in softkey
> 10. x-up-devcap-titlebar : 0 or 1. What does this mean? Means wheter title tag i
> n wml is visible or not?
> 11. x-up-devcap-immed-alert : 0 or 1
> 12. x-up-fax-accepts : acceptable file MIME types.
> 13. x-up-fax-encodings : like 7bit, 8bit, base64, quoted-printable
> 14. x-up-fax-limit : max fax size in bytes
> 15. x-up-devcap-nl : what is this? has values like 720
> 16. x-up-devcap-msize : width and height of pixels of character "M"
> 17. x-up-devcap-smartdialing : 0 or 1
> 18. x-up-subno : Unique subscriber ID
> 19. x-up-devcap-charset : Like Shift_JIS
> 20. x-up-uplink : MAG server name.
> 21. x-up-download-accept : 0 or 1
> 
> Rest are normal http headers such as accept, accept-charset, host, content-type,
>  accept-language.
> Some phones support jpeg while their accept header does not list jpeg. and jpeg 
> of size same as x-up-devcap-screenpixels is resized to a smaller image. Why?
> 
> Ankit