CODEWITHSUNDEEP
pythonnumpyjpegpython-imaging-library
Asanthi AjithSingh Udawatta
Asanthi AjithSingh Udawatta

Reputation: 35

Merging three numpy arrays as jpeg image in python

I have split a jpeg image into r,g,b and I converted them into numpy arrays. Then I changed the pixel values of r,g,b. Now I want to merge these three into one jpeg and save it. My original image is a 1024 * 500 image. If someone can give me an idea, it will be a great help

im =Image.open("new_image.jpg")
r,g,b=im.split()

r=np.array(r)
g=np.array(g)
b=np.array(b)

Then I changed the values of the pixels. I want to merge the resulting r,g,b. Thanks in advance

Upvotes: 1

Views: 1779

Answers (2)

unutbu
unutbu

Reputation: 879561

To convert a PIL Image to a NumPy array:

img = Image.open(FILENAME).convert('RGB')
arr = np.array(img)
r, g, b = arr[:,:,0], arr[:,:,1], arr[:,:,2]
...

To convert r, g, b (2-dimensional) NumPy arrays of dtype uint8 to a PIL Image:

arr = np.dstack([r, g, b])
img = Image.fromarray(arr, 'RGB')

This works because Image.fromarray can create a PIL Image from any object that supports the NumPy array interface.

Upvotes: 2

Salvador Dali
Salvador Dali

Reputation: 222541

Based on this document (page 4 in the end), you can do this with merge:

r, g, b = im.split()
im = Image.merge("RGB", (b, g, r))

Upvotes: 1

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