10-01-2017, 08:24 PM
Several things that you have not explained.
Is it a RGB image or Indexed (Image > Mode)
Are you working only in Gimp? Or are you exporting to jpg and then using the jpg on the beach scene? (jpg does not support transparency)
When you created the silhouette did you create it with a transparent background? Or is a pure black and white silhouette, white background and black image?
If pure black and white silhouette and RGB it is easy.
(Colours > Colour to Alpha). Accept the default white.
Is it a RGB image or Indexed (Image > Mode)
Are you working only in Gimp? Or are you exporting to jpg and then using the jpg on the beach scene? (jpg does not support transparency)
When you created the silhouette did you create it with a transparent background? Or is a pure black and white silhouette, white background and black image?
If pure black and white silhouette and RGB it is easy.
(Colours > Colour to Alpha). Accept the default white.