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Overwriting a border on an image in Python PIL

I have a gallery application where the users upload photos and my code gives it a border, writes some of the photo attributes on the border and stores it.

image2 = Image.open('media/' + str(image.file))
width, height = image2.size;
image2 = ImageOps.expand(image2, border=(int(width/25),int(height/20),int(width/25),int(height/10)), fill='rgb(0,0,0)')


(Note that here my bottom border is longer than the top because I am writing attributes on the bottom border.)
Now I'm building an edit feature for the uploaded images where the user can change the attributes of the uploaded images. But the attributes that are already written on the border have to be overwritten.

So here, my approach is to put a black patch on the bottom border and re-write the new attributes without changes the top and side borders and without changing the aspect ratio. All of this has to be done using PIL.

Question is how do I put a black box on the bottom border?

I tried ImageOps.fit() as mentioned here https://pillow.readthedocs.io/en/3.3.x/reference/ImageOps.html#PIL.ImageOps.fit, but the aspect ratio doesn't seem to be right and I want to overwrite on the black border a black box and not crop the photo.

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2 Answers
2

The simplest way in my opinion is to create a new black image and paste onto your existing image -

from PIL import Image
im = Image.open('test.png')
blackBox = Image.new(im.mode, (im.width, 50), '#000')
im.paste(blackBox, (0, im.height - blackBox.height))


Alternatively, you could use ImageDraw - http://pillow.readthedocs.io/en/5.2.x/reference/ImageDraw.html - which you could use to draw rectangles and other shapes.

from PIL import Image, ImageDraw
im = Image.open('test.png')
d = ImageDraw.Draw(im)
d.rectangle((0, im.height - 50, im.width, im.height), fill='#000')


To me it seems like the easiest solution is just quickly draw the black pixels in the area that you want using a couple loops and Image.putpixel

Image.putpixel

from PIL import Image

img = Image.open('red.png')

for x in range(img.width):
for y in range(img.height - 40, img.height):
img.putpixel((x, y), (0, 0, 0))

img.save('red2.png')


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