CODEWITHSUNDEEP
pythonpython-imaging-library
KVISH
KVISH

Reputation: 13208

PIL round edges and add border

I'm currently using this method to round the edges on images for my users:

def _add_corners(self, im, rad=100):
    circle = Image.new('L', (rad * 2, rad * 2), 0)
    draw = ImageDraw.Draw(circle)
    draw.ellipse((0, 0, rad * 2, rad * 2), fill=255)
    alpha = Image.new('L', im.size, "white")
    w, h = im.size
    alpha.paste(circle.crop((0, 0, rad, rad)), (0, 0))
    alpha.paste(circle.crop((0, rad, rad, rad * 2)), (0, h - rad))
    alpha.paste(circle.crop((rad, 0, rad * 2, rad)), (w - rad, 0))
    alpha.paste(circle.crop((rad, rad, rad * 2, rad * 2)), (w - rad, h - rad))
    im.putalpha(alpha)
    return im

The rounding works perfectly fine and i'm happy with it. However, I would like to also draw a border around the image within the constraints of the edges. Most of what I'm reading online shows how to draw border on the image itself (not the rounded border i'm doing). Is there a way to do that? I have read the below:

how to round_corner a logo without white background(transparent?) on it using pil?

Python Imaging Library (PIL) Drawing--Rounded rectangle with gradient

Any way to make nice antialiased round corners for images in python?

Upvotes: 5

Views: 7027

Answers (1)

Cortexan
Cortexan

Reputation: 26

This is a rather late response, but you can essentially use the same method twice, once applied to your image and then again to a new, slightly larger background image. You then simply paste the foreground onto the background. I've updated the function you provided to do so below:

def add_corners(im, rad=50, bg=True, bgCol='white', bgPix=5):
    bg_im = Image.new('RGB', tuple(x+(bgPix*2) for x in im.size), bgCol)
    ims = [im if not bg else im, bg_im]
    circle = Image.new('L', (rad * 2, rad * 2), 0)
    draw = ImageDraw.Draw(circle)
    draw.ellipse((0, 0, rad * 2, rad * 2), fill=255)
    for i in ims:
        alpha = Image.new('L', i.size, 'white')
        w, h = i.size
        alpha.paste(circle.crop((0, 0, rad, rad)), (0, 0))
        alpha.paste(circle.crop((0, rad, rad, rad * 2)), (0, h - rad))
        alpha.paste(circle.crop((rad, 0, rad * 2, rad)), (w - rad, 0))
        alpha.paste(circle.crop((rad, rad, rad * 2, rad * 2)), (w - rad, h - rad))
        i.putalpha(alpha)
    bg_im.paste(im, (bgPix, bgPix), im)
    return im if not bg else bg_im

Upvotes: 0

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