[Coco] Coco3 colors

[Fedor Steeman]

Thank you that was useful. I downloaded the file and will put it to good
use. :-)

Cheers,
Fedor Steeman

On 11 January 2013 14:59, Richard Goedeken
<Richard at fascinationsoftware.com>wrote:

> Hello,
>
> I'm a long time Coco fan and software engineer. I recently started kicking
> around the idea of writing a coco 3 side scroller game for fun.  I thought
> that I should get some hex color values for the 64-color palettes to use
> while making the graphics.  I didn't see any good documentation on the web
> for this, so I took the code from the latest mame release which generates
> the coco 3 palettes and built it into a test app to dump out the values.  I
> thought this information might be useful to other people on this list, so I
> have uploaded the results to this pastebin page:
>
> http://pastebin.com/nm9WJ6Gv
>
> This table has hex values (00-FF) for both RGB and Composite output modes
> in R,G,B order.  I also did another little trick to generate 'closest
> match' tables as well.  I converted the RGB values to a different color
> space which is supposed to allow one to calculate a 'perceptual difference'
> metric using the euclidean distance between different colors.  I then used
> this to calculate the "closest" Composite palette color index for each RGB
> palette color, and vice versa.  This is in the last 2 columns.  For
> instance, you can see example colors at this web page:
>
> http://www.coco3.com/**community/2009/09/64-**composite-coco-colors/<http://www.coco3.com/community/2009/09/64-composite-coco-colors/>
>
> BTW the last column of colors is wrong in each of these images for some
> reason.  But if you look at RGB color 34, it's a sort of dark orange color.
> Then if you go to index 34 of the color table, the "RGB-match" column value
> is 21.  This column gives the corresponding Composite palette index which
> looks the closest to the RGB color.  In this case, color 21 in the
> Composite palette is a similar shade but just a little bit lighter.  To my
> eyes it looks like the best match.  Correspondingly, Composite color 34 is
> light green with a hint of yellow.  The "Comp-Match" value for index 34 is
> 51.  If you look at RGB color 51, it's also a green with a hint of yellow
> hue.
>
> I hope someone finds this information useful.  I can also post the code if
> anyone is interested.
>
> Regards,
> Richard
>
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