Greyscale question

[Matto555]

So, I'm trying to create a greyscale heightmap, and basically for whatever reason I have a heightmap that is tainted blue.

Basically what I want to change is make it so that where it's rgb (0, 0, 98) I want it to be rgb (98, 98, 98) and where it's rgb (0, 0, 65) I want it to be rgb (65, 65, 65) and so on. I tried using the simple black & white tool but that doesn't give the result I'm trying to get, as I need to keep the base rgb value of blue the same and basically make the red and green values equal to the blue values throughout the entire image as the red and green values are all 0 currently.

 

Hopefully that makes sense and there's a solution to this.

Thanks!

[toe_head2001]

This will copy the value of the Blue channel to the Red and Green channels.

void Render(Surface dst, Surface src, Rectangle rect)
{
    ColorBgra CurrentPixel;
    for (int y = rect.Top; y < rect.Bottom; y++)
    {
        if (IsCancelRequested) return;
        for (int x = rect.Left; x < rect.Right; x++)
        {
            CurrentPixel = src[x,y];
            CurrentPixel.R = CurrentPixel.G = CurrentPixel.B;
            dst[x,y] = CurrentPixel;
        }
    }
}

https://forums.getpaint.net/topic/111233-codelab-for-average-users-a-laymans-guide/

 

 

Is this what you're looking for?

[MJW]

If you want a pre-built plugin, Black and White+ will work if you set the Blue and Green weights to 0. (Setting the Red weight to 1 isn't necessary, since the weights are normalized by default.)

[Matto555]

47 minutes ago, toe_head2001 said:

This will copy the value of the Blue channel to the Red and Green channels.

void Render(Surface dst, Surface src, Rectangle rect)
{
    ColorBgra CurrentPixel;
    for (int y = rect.Top; y < rect.Bottom; y++)
    {
        if (IsCancelRequested) return;
        for (int x = rect.Left; x < rect.Right; x++)
        {
            CurrentPixel = src[x,y];
            CurrentPixel.R = CurrentPixel.G = CurrentPixel.B;
            dst[x,y] = CurrentPixel;
        }
    }
}

https://forums.getpaint.net/topic/111233-codelab-for-average-users-a-laymans-guide/

 

 

Is this what you're looking for?

 

Yep! That's exactly what I wanted!

Thanks!

Edited May 3, 2018 by Matto555