🔒 How could I achieve this?

[late hill]

@sonic stump

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[half glade]

Depends on how complex the image is. But in general, you would use OpenCV to help define the silhouette. And then draw on it by thickening the border.
Do you have an example image?

[half glade]

Yes, they are the same thing. But since this image is transparent, there are actually a few ways you can do this.

1. take the image, make all non transparent pixels white, scale up a little bit, and finally put the original image back on top. This is conceptually the easiest.
2. ignore that part and do the more complex canny edge detection and then make a white line mask around the edge. This is a more general approach that can handle other types of images. It isn't perfect per se. And it requires more topics to learn. So up to you

https://pyimagesearch.com/2021/05/12/opencv-edge-detection-cv2-canny/ more in depth
https://stackabuse.com/opencv-edge-detection-in-python-with-cv2canny/ shorter

[late hill]

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