Re: Re: [ROOT] Shades of gray

From: Chris Milne (phycm@phy.hw.ac.uk)
Date: Tue Aug 14 2001 - 13:47:46 MEST


Hi there,

Can anyone help, I was interested in the below message and have used it myself, 
however I am more interested in 100 colours than 100 shades of grey. Can someone 
tell me what alteration is needed

Thanks 
Chris Milne 

>Hi Adam,
> 
>//example of new colors (greys) and definition of a new palette
>void palette() {
>   const Int_t colNum = 100;
>   Int_t palette[colNum];
>   for (Int_t i=0;i<colNum;i++) {
>      TColor *color = new TColor(501+i
>                                ,1-Float_t(i)/colNum
>                                ,1-Float_t(i)/colNum
>                                ,1-Float_t(i)/colNum,"");
>      palette[i] = 501+i;
>   }
>   gStyle->SetPalette(colNum,palette);
>
>   TF2 *f2 = new TF2("f2","exp(-(x^2) - (y^2))",-1.5,1.5,-1.5,1.5);
>   f2->SetContour(colNum);
>   f2->Draw("contz");
>}
>
>Rene Brun
>
>On Mon, 13 Aug 2001, Adam Bouchta wrote:
>
> 
>>  Hello,
>> 
>> I wonder how one can expand the number of gray-levels in the palette? For
>> the moment I just limit the number of colors to 9 and get that number of
>> grays. How can one get 100 or so levels?
>> 
>> Thanks,
>> 
>>       Adam.
>> 



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