Replace a Daytime Background with a Nighttime Image

Choose an image with a daytime background and a nighttime background to replace it with:

In[1]:=

i=

;bg=

;

Use a Chan-Vese segmentation method to find the background of the giraffe image, looking for colors close to light blue, and automatically choosing the foreground color:

In[2]:=

mask=Closing[ChanVeseBinarize[i,{{Automatic,Lighter@Blue}}]//FillingTransform,1]

Out[2]=

Select just the foreground of the giraffe image:

In[3]:=

masked=SetAlphaChannel[i,Blur@mask]

Out[3]=

Add the nighttime image to the background:

In[4]:=

res=ImageCompose[ImageResize[bg,ImageDimensions[i]],masked]

Out[4]=

Wolfram Language Example Repository

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Replace a Daytime Background with a Nighttime Image

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