Re: Use of cmy colour codes in Terminator

[pauline-galea]

Apologies, I was referring to 

G=$(((~M&0xFF)*M/255))

The first M in the Magenta value, right

> Sent: Wednesday, April 21, 2021 at 10:47 AM
> From: "Koichi Murase" <myoga.murase@gmail.com>
> To: pauline-galea@gmx.com
> Cc: "help bash" <help-bash@gnu.org>
> Subject: Re: Use of cmy colour codes in Terminator
>
> 2021年4月20日(火) 12:53 <pauline-galea@gmx.com>:
> > I looked at some conversions but everything looks very confusing to me,
> > as many use percentages.  Are you sure the CMYK to RGB conversion is
> > correct?
> 
> Do you think the expression in my previous mail is incorrect?  Could
> you tell me what is wrong?  Maybe there is some mistake, so please
> check the expression on your own.
> 
> As I have described in the previous mail, RGBCMYK are assumed to have
> values between 0..255, i.e., 0 <= C <= 255, 0 <= M <= 255, 0 <= Y <=
> 255, 0 <= K <= 255.  In this case, (~C&0xFF) is equivalent to (255-C).
> By scaling the CMYK ranges in the conversion formula, I think you can
> confirm that the formulae are equivalent.
> 
> --
> Koichi
>