如何将“垂直"转换为“垂直"?图像变成“水平"图像图像? [英] How to transform a "vertical" image into a "horizontal" image?

问题描述

我在Python中遇到了一个问题.我想要一个垂直"的通过使用彩色(例如:白色)填充边框，将图像大小调整为<​​code> 1920 x 1080 .

我想要一张这样的照片

要转换成这样的图片

我用枕头来尝试一些东西，但是没有什么决定性的事情发生.

解决方案

一般的方法是在保持宽高比的同时将输入图像调整为所需的高度.您需要根据调整后的输入图像的目标宽度和当前宽度来确定必要边框的大小.然后，两种方法可能适用:

• 要么使用

    ----------------------------------------系统信息----------------------------------------平台:Windows-10-10.0.16299-SP0的Python:3.8.5枕头:8.1.0---------------------------------------- 

  I'm facing an issue in Python. I want a "vertical" image to be resized to 1920 x 1080 by filling the borders with a color (ex: white).

  I want a picture like this one

  to be converted into a picture like this one

  I used Pillow in order to try something, but nothing very conclusive happened.

  解决方案

  The general pipeline would be to resize the input image to the desired height while keeping the aspect ratio. You'll need to determine the size of the necessary border(s) from the target width and current width of the resized input image. Then, two approaches might be applicable:

  • Either use ImageOps.expand to directly add borders of the desired sizes and color.
  • Or, use Image.new to create to new image with the proper target size and desired color, and then use Image.paste to paste the resized input image into that image at the proper location.

  Here's some code for both approaches:

  from PIL import Image, ImageOps
  
  # Load input image
  im = Image.open('path/to/your/image.jpg')
  
  # Target size parameters
  width = 1920
  height = 1080
  
  # Resize input image while keeping aspect ratio
  ratio = height / im.height
  im = im.resize((int(im.width * ratio), height))
  
  # Border parameters
  fill_color = (255, 255, 255)
  border_l = int((width - im.width) / 2)
  
  # Approach #1: Use ImageOps.expand()
  border_r = width - im.width - border_l
  im_1 = ImageOps.expand(im, (border_l, 0, border_r, 0), fill_color)
  im_1.save('approach_1.png')
  
  # Approach #2: Use Image.new() and Image.paste()
  im_2 = Image.new('RGB', (width, height), fill_color)
  im_2.paste(im, (border_l, 0))
  im_2.save('approach_2.png')
  

  Both create an image like this:

  ----------------------------------------
  System information
  ----------------------------------------
  Platform:    Windows-10-10.0.16299-SP0
  Python:      3.8.5
  Pillow:      8.1.0
  ----------------------------------------
  

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