To fix the opacity of the image, duplicate the image layer about 5 times or more and group all those layers plus the original layer. The result will be a fully opaque image.
The colouring is another issue. You could select the background with the Magic Wand Tool (W), invert the selection, fill a new layer with the required colour, and change the layer blending mode to
Source : Link , Question Author : ADITYA KAUSHIK , Answer Author : Billy Kerr