[Coco] Color Error in VCC

[Luis Fernández]

Ok thank
 

> Date: Thu, 8 Mar 2012 11:02:18 -0500
> From: robert.gault at att.net
> To: coco at maltedmedia.com
> Subject: Re: [Coco] Color Error in VCC
> 
> Luis Fernández wrote:
> >
> > HI
> > I found a mistake in the colors emulated by VCC.
> > he error is basic and wonder to occur.
> > A simple test program is
> >
> > 10 CLS
> > 20 FOR A=0 TO 255
> > 30 POKE 1024+A,A
> > 40 NEXT
> > 50 GOTO 50
> >
> > http://luis45ccs.blogspot.com/2012/03/error-de-color-en-el-emulador-de-color.html
> >
> >
> >
> >
> >
> >
> >
> >
> > Apparently my right colors are not correct
> > coconut lit my TV and found the following
> > color
> > 0 Green
> > 1 Yellow
> > 2 Dark Blue
> > 3 Purple or violet
> > 4 White
> > 5 green somewhat darker
> > 6 Light blue, purple something
> > 7 Orange
> >
> > 
> >
> 
> Luis,
> 
> Whatever you are seeing, it is not the result of VCC. I just ran a test with a 
> US Coco3 using both RGB and Composite 60Hz monitors. Before running your 
> program, either the RGB or CMP commands were used to get an appropriate color 
> set. The colors displayed on the matching monitor were a very close match to the 
> colors displayed by VCC 1.42 on a Samsung SyncMaster 204B digital monitor. The 
> CMP and RGB monitor colors were very close to each other but not a perfect 
> match, starting with the appropriate color set.
> 
> Now with the real hardware, it was necessary to adjust brightness, contrast, 
> color intensity, and tint. If that was not done, the colors were not quite what 
> they should have been. That should not be a surprise as the Coco can't exactly 
> match CMP and RGB colors given the small range of possible colors.
> 
> The Coco3 and therefore VCC default to the CMP color set. There may be small 
> differences in color between NTSC and PAL sets or even 60 and 50Hz units. Your 
> program does not force the use of a specific color set, and it should if you 
> want any chance of getting appropriate colors.
> 
> Robert
> 
> 
> 
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