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From: Richard Ashbery <basura@invalid.addr.uk>
Newsgroups: comp.sys.acorn.programmer
Subject: Re: White background colour in GCOL is grey.
Date: Wed, 12 May 2021 14:53:42 +0100
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In article
<912abee8-d3e2-482b-8da5-21a84513ab87n@googlegroups.com>,
   George Pearce <chasgpearce@gmail.com> wrote:
> Could some kind soul help an ageing forgetful BASIC programmer.

> I am simply trying to open a graphics window with a white
> background in 16 million colour mode in RIScOS 4.?. I am calling
> MODE MODE in 1900x1080p. GCOL seems to have been extended in v5.

> Best I can do is GCOL 0, 191, which seem to give a light grey
> rather than full white. I can obviously correct this after the
> event, but am sure there must be a solution which I have yet to
> discover.

GCOL ON 255,255,255 : CLG

Hope that helps

Richard