I have these two textures and I want to change the white or grayish parts in the images to glowing red or normal red can anybody tell me how to change the color of textures.
And
The color I want is like this
I have these two textures and I want to change the white or grayish parts in the images to glowing red or normal red can anybody tell me how to change the color of textures.
And
The color I want is like this
try to copy these nodes and change the colours and values where you need to.

In your case the secondary colour you want is red so change the 'colour 1' in the multiply node from plain white to red.
remember color ramp node is optional
HOPE THIS HELPED!!
Facin a Mix RGB node – Robin Betts Jul 01 '21 at 10:11