Masks are used to control which pixels are concealed or revealed on any image layer except the background layer. If the mask layer that has been used to conceal pixels is then discarded the original pixels reappear. This approach to montage work is termed ‘non-destructive’. In the full version of Photoshop the mask is applied to the image layer whilst in Elements the mask is applied to a separate layer or the layer mask from an adjustment layer.
1. Open the resource images and drag the layer thumbnail of the train ...