[英]How to remove extra transparent pixels from an image
I have a series of transparent logos.我有一系列透明标志。 I paste them on a canvas using PIL.
我使用 PIL 将它们粘贴到 canvas 上。 Some of these logos have extra transparent pixels that make the bounding box too wide, like this:
其中一些徽标具有额外的透明像素,使边界框过宽,如下所示:
However, I need these logos and the bounding boxes to be like this:但是,我需要这些徽标和边界框是这样的:
How can I remove these extra, unnecessary transparent pixels so the bounding box wraps the logo properly?如何删除这些额外的、不必要的透明像素,以便边界框正确包裹徽标?
Here are some of the logos:以下是一些徽标:
From this answer , you can calculate the bounding box of the non-zero regions (transparent/alpha) and then programmatically crop it.从这个答案中,您可以计算非零区域(透明/alpha)的边界框,然后以编程方式对其进行裁剪。
Snippet from answer:答案摘录:
import Image
im = Image.open("test.bmp")
im.size # (364, 471)
im.getbbox() # (64, 89, 278, 267)
im2 = im.crop(im.getbbox())
im2.size # (214, 178)
im2.save("test2.bmp")
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