Concept: Layer masking of Adobe Photoshop has great many features. You mask one image with another and keep black color at the foreground, you will find that where ever you paint with black on the mask, the below layer image will be revealed. If you change foreground color to white and start painting with white on the mask, you all again get the original top layered image. Its one of the best tool to mix the images for collage.
1. Layer masking can be used to create
advanced mixing effects without changing original images.
2. Open Photoshop. Open main image which will be used
as a base.

3. Open another image to apply Layer Masking Techniques.

4. Drag this image on the main image using Move Tool.
Keep this Layer selected.
5. Layer > Add Layer Mask
> Reveal All

6. Select Brush Tool with soft brush. Make sure that
black color is automatically selected as a foreground.
7. Start painting with Brush Tool in the center of
an image.
8. Wherever you paint that area will get revealed.

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