Python PIL/Image make 3x3 Grid from sequence Images

Question

I'm trying to make a 3x3 Grid by sequence images but can't seem to get it right. The images are in folder, named from 0 - 8 (total 9 images), the output of the final one image grid of 3x3 should as follow

image0 image1 image2
image3 image4 image5
image6 image7 image8 

I was trying to follow How do you merge images into a canvas using PIL/Pillow? but couldn't get it work correctly.

There are no need to change anything in the image, just merge them and make a 3x3 Grid

Answer 1

To make a grid of arbitrary shape (cols*img_height, rows*img_width) out of rows*cols images:

def image_grid(imgs, rows, cols):
    assert len(imgs) == rows*cols

    w, h = imgs[0].size
    grid = Image.new('RGB', size=(cols*w, rows*h))
    grid_w, grid_h = grid.size
    
    for i, img in enumerate(imgs):
        grid.paste(img, box=(i%cols*w, i//cols*h))
    return grid

In your case, assuming imgs is a list of PIL images:

grid = image_grid(imgs, rows=3, cols=3)

Answer 2

Here's an example how this can be done (consider image is one of your images):

    img_w, img_h = image.size
    background = Image.new('RGBA',(1300, 1300), (255, 255, 255, 255))
    bg_w, bg_h = background.size
    offset = (10,(((bg_h - img_h)) / 2)-370)
    background.paste(image1,offset)

Adjust the offset, width and height to fit your requirements.