How to merge 100 images to get a huge image?

Question

I got some problem with merging 100 images, so that they build a 10 x 10 huge picture like above: I tried like this:

from PIL import Image
image1 = Image.open("4XP6edit.png")
image2 = Image.open('4MBSedit.png')
(width, height) = image1.size
result_width = 10*width
result_height = 10*height

result = Image.new('RGB', (result_width, result_height))
result.paste(im=image1, box=(0, 0))
result.paste(im=image2, box=(width, 0))
result.paste(im=image2, box=(2*width, 0))
# and so on until 10*width, 0 and than:
result.paste(im=image10, box=(0, height))
result.paste(im=image10, box=(0, 2*height))

This works fine, but I want it to be created automatically in a for loop or sth. But my suggestion doesnt work.. Can someone find my mistake?

length = len(protein_list)
k=0; m=0; j=0

for i in range(length):
    image= Image.open(str(protein_list[i] + 'edit.png')

    (width, height) = image.size

    result_width = 10*width 
    result_height = 10*height

    result = Image.new('RGB', (result_width, result_height))
    if (k == 10): k = 0
    if (j >= 0 and j <= 9):  m = 0
    if (j >= 10 and j <= 19):  m = 1
    if (j >= 20 and j <= 29): m = 2
    if (j >= 30 and j <= 39): m = 3
    if (j >= 40 and j <= 49): m = 4    
    if (j >= 50 and j <= 59): m = 5
    if (j >= 60 and j <= 69): m = 6    
    if (j >= 70 and j <= 79): m = 7
    if (j >= 80 and j <= 89): m = 8
    if (j >= 90 and j <= 99): m = 9    

    result.paste(im=image, box=(k*width, m*height))
    k= k+1
    j=j+1


result

I know this if part is really ugly but I am new in programming so please excuse this.. Can someone help me with this? It shows a huge 10x10 black picture in which a single picture of the proteinedit.png is displayed.. it looks like this

Can you elaborate on what you mean by your solution "doesn't work"? Is it throwing an error? Are the results wrong? If so, how are they wrong? Please [edit] your question to include those details. — Mr. Llama, Oct 23 '18 at 13:55
This question has already been answers here: [https://stackoverflow.com/questions/30227466/combine-several-images-horizontally-with-python](https://stackoverflow.com/questions/30227466/combine-several-images-horizontally-with-python) — Y.Wang, Oct 23 '18 at 13:56
@Y.Wang I looked at this example but it didn't help me because its only for mering images horizontally.. i need it 10x10 — Anja, Oct 23 '18 at 14:11
@ Anja, I was serious about there being a lot more problems with this code in terms of readability and quality. I suggest you post this code on [code review](https://codereview.stackexchange.com/) for some tips. This code can be made a lot simpler — Maarten Fabré, Oct 24 '18 at 07:23
Try this: https://github.com/hugovk/pixel-tools/blob/master/contact_sheet.py — Hugo, Oct 25 '18 at 06:39

score 3 · Accepted Answer · answered Oct 23 '18 at 14:30

it looks like that because you define your result image every iteration of the loop. If all images are the same size, you can do something like this:

length = len(protein_list)
k=0; m=0; j=0
result = None

    for i in range(length):
        image= Image.open(str(protein_list[i] + 'edit.png')
        if result is None:
            (width, height) = image.size

            result_width = 10*width 
            result_height = 10*height

            result = Image.new('RGB', (result_width, result_height))

    if (k == 10): k = 0
    ...

result

The rest of the code can use a lot of improvements, so if this works, I would take that code to Code Review SO.

How to merge 100 images to get a huge image?

1 Answers1