Grayscale along a gradient

yummy · #1 15-Apr-2009, 07:12

Hi there,

I am using visual C++, using visual studio windows forms.

I have a bitmap which shows different colours which relate to different temperatures ranging from blue(cold) through green yellow orange and finally red (hottest).

How can I make a grayscale function/algorithm to mimick this to grayscale, keeping the linear gradient - so that the greyscale will go from lighter to darker???

The range of grayscales will be important to ensure a reasonably good visual resolution.

Any help, ideas?

Thanks

Yummy

(I believe this is the right forum for this post)

fakepoo · #2 15-Apr-2009, 07:50

Every shade of gray has the same value for Red, Blue, and Green. So, if you had a scale from 0.0 (Black) to 1.0 (White), you could have a function like:

CPP / C++ / C Code:

// Assuming there is a class called Color who's constructor takes 3 doubles between 0.0 and 1.0 for Red, Blue, and Green

// Scale is a value between 0.0 and 1.0
Color GetGrayScale( double Scale )
{
   return Color(Scale,Scale,Scale);
}

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Grayscale along a gradient

Re: Grayscale along a gradient