Draw it into a Picture object, and loop over its RGBSurface doing:
c=rs.Pixel(n,j)
k=(C.Red * 0.275) + (C.Green * 0.58) + (C.Blue * 0.145)
rs.Pixel(n,j)=rgb(k,k,k)
you could also just average out the three colours, ie
k=(c.red+c.green+c.blue)\3
but I found that the one above produced better results. My ImageTools
library [plain RB] does that and much more.
HTH
--
dda
ImageTools, pure RB fast graphics
http://sungnyemun.org/?q=node/3
RBDeveloper Columnist, "Beyond the Limits"
http://rbdeveloper.com
On 3/31/06, Mark O'Neill <[EMAIL PROTECTED]> wrote:
> Hi All,
>
> I'm not too hot at graphics, so please
> excuse me if this is a simple question,
> but how would I go about drawing a
> picture (which is a color JPG) as
> greyscale on a canvas?
>
> Thanks for your help.
>
> All the best,
>
> Mark.
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