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Groups > comp.sys.acorn.programmer > #6266

Re: White background colour in GCOL is grey.

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In message <bf20a335-0a73-4649-a195-b8a69bc329f2n@googlegroups.com>
          George Pearce <chasgpearce@gmail.com> wrote:

> On Wednesday, 12 May 2021 at 18:35:03 UTC+1, Steve Fryatt wrote:
>> On 12 May, Richard Ashbery wrote in message
>> <592b7c18...@invalid.addr.uk>:
>>> In article <912abee8-d3e2-482b...@googlegroups.com>,
>>> George Pearce <chasg...@gmail.com> wrote:
>> 
>>>> 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
>> That's RISC OS 5 only, so doesn't meet the OP's requirement of RISC OS 4
>> unless soft-loading BASIC is up for consideration.
>> 
>> GCOL 0, 255, 255, 255 : CLG might do what's required, though.
>> 
>> --
>> Steve Fryatt - Leeds, England
>> 
>> http://www.stevefryatt.org.uk/

> No, that does not work, screen colour is still black.
> It seems to me there is an issue with COL, GCOL in 16 million mode, with
> no distinction between foreground and background colours, and no palette
> as such. In 16 and 256 colour modes ,  colours  up to 128 are foreground,
> and above that are background.
> I'm now very confused. I think the BASIC manual needs updating to deal
> with the larger monitor resolutions we now mostly have, and the entries
> for COL and GCOL need to address 16million mode.
> I understand their application in 16 and 256 colour modes, though I do
> find the manual a bit confusing.

> George Pearce

What about GCOL 0,255 TINT 4. Although the manual implies tint is for 
256/16 colour modes it does have an effect on my machine.

Have you tried the basic help - help GCOl which might give you a hint as 
to what RO4 can offer?

John

-- 
                          _________________________________________
                       |   University of Glos. Blighting Longlevens.
                       |   mailto:john@jpeachey.co.uk
_______________________|   http://www.jpeachey.co.uk

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White background colour in GCOL is grey. George Pearce <chasgpearce@gmail.com> - 2021-05-11 07:03 -0700
  Re: White background colour in GCOL is grey. Richard Coleman <coleman@orpheusmail.co.uk> - 2021-05-12 06:44 -0700
  Re: White background colour in GCOL is grey. Richard Ashbery <basura@invalid.addr.uk> - 2021-05-12 14:53 +0100
    Re: White background colour in GCOL is grey. Steve Fryatt <news@stevefryatt.org.uk> - 2021-05-12 18:23 +0100
      Re: White background colour in GCOL is grey. George Pearce <chasgpearce@gmail.com> - 2021-05-13 02:38 -0700
        Re: White background colour in GCOL is grey. Martin <News03@avisoft.f9.co.uk> - 2021-05-13 12:33 +0100
          Re: White background colour in GCOL is grey. George Pearce <chasgpearce@gmail.com> - 2021-05-13 06:40 -0700
            Re: White background colour in GCOL is grey. News <chrisjohnson@spamcop.net> - 2021-05-13 16:49 +0100
            Re: White background colour in GCOL is grey. Martin <News03@avisoft.f9.co.uk> - 2021-05-13 17:09 +0100
              Re: White background colour in GCOL is grey. George Pearce <chasgpearce@gmail.com> - 2021-05-13 09:22 -0700
        Re: White background colour in GCOL is grey. J Peachey <john@jpeachey.co.uk> - 2021-05-13 15:04 +0100
        Re: White background colour in GCOL is grey. Steve Fryatt <news@stevefryatt.org.uk> - 2021-05-13 21:52 +0100
          Re: White background colour in GCOL is grey. George Pearce <chasgpearce@gmail.com> - 2021-05-14 02:54 -0700
            Re: White background colour in GCOL is grey. Martin <News03@avisoft.f9.co.uk> - 2021-05-14 11:05 +0100
              Re: White background colour in GCOL is grey. George Pearce <chasgpearce@gmail.com> - 2021-05-14 07:50 -0700

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