Combine Multiple Images
Make a single image from multiple images by collaging, overlaying or assembling an array of image components.
Into a Collage...
Make a collage from a collection of images:
In[1]:=1

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Out[1]=1

Assign relative weights to the images:
In[2]:=2

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Out[2]=2

By Overlaying...
Overlay an image with a second image:
In[3]:=3

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Out[3]=3

- If the background of the overlaid image is not transparent, it will obscure the image below. Use the option setting Background->None with Graphics and Rasterize to make images with transparent backgrounds.
Specify the position of the overlaid image:
In[4]:=4

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Out[4]=4

From an Array of Image Components...
Combine an array of images into a single image:
In[5]:=5

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Out[5]=5

- Component images must all be the same size.