Re: xPLRioNet - A Challenge

["Doc_in_texas" <doc_in_texas@xxxxxxxxx>]

Try converting the RGB to 8bit greyscale. Now you only have 256
values to worry about. Then it becomes a matter of which contrast
looks better on the dinky little DAR LCD. Anything above your
contrast point becomes white, below is black. I don't recall a RGB to
greyscale algorythm but you should be able to google one.

A day or so ago you sent me the transcode.xml line to pipe through
lame. It didn't work for me but it's possible I didn't have lame
installed correctly. I moved LAME.EXE and LAME_enc.dll from another
PC to the WINNT directory. Anyway, after adding the line, the DAR
would hang in "initializing" limbo. I removed the line and all is
well.

Gary


--- In ukha_xpl@xxxxxxx, "Tony Tofts" <tony@x> wrote:
> Hi all,
>
> While coding up routines to handle the riot display for the Rio in
xplrionet
> I thought it would be a bit of fun to include the ability to render
an image
> onto the rio's screen...
>
> I'm currently looking at a Rio which is displaying an Album cover ;-
)
>
> Problem is the conversion from colour bitmap to pure black and
white (not
> grey scale) isn't great.
>
> I'm currently taking a pass thru the bitmap, taking an average of
the RGB
> per pixel, and then an overall average.
>
> Then when rendering if the total of rgb < than the average it's
black, else
> it's white.
>
> But I think it could be a lot better. I believe you have to do
stuff like
> giving each RGB part a different weighting?
>
> So the challenge is... Can someone find a (not too complicated)
formula to
> give a decent image please?
>
> Many thanks
> Tony





xPL Links: http://www.xplproject.org.uk http://www.xplhal.com http://www.xpl.myby.co.uk
To Post a Message: ukha_xpl@xxxxxxx
To Subscribe:  ukha_xpl-subscribe@xxxxxxx
To Unsubscribe:  ukha_xpl-unsubscribe@xxxxxxx