pillow

Converting a byte array to an image file

由 有些话、适合烂在心里 提交于 2021-01-28 07:40:30
问题 I have an Arducam hooked up to an Arduino UNO over SPI. I am having the camera take a photo and send the data back over SPI to my Arduino. I have a python script that is capturing the serial output from the camera (which should be the image data) and saving it to a text file. My python code for saving the data to a text file looks something like this: import serial import time ser = serial.Serial('/dev/cu.usbmodem621', 115200) f = open('data.txt','a') #pause to let everything get warmed up

Converting a byte array to an image file

由 最后都变了- 提交于 2021-01-28 07:21:33
问题 I have an Arducam hooked up to an Arduino UNO over SPI. I am having the camera take a photo and send the data back over SPI to my Arduino. I have a python script that is capturing the serial output from the camera (which should be the image data) and saving it to a text file. My python code for saving the data to a text file looks something like this: import serial import time ser = serial.Serial('/dev/cu.usbmodem621', 115200) f = open('data.txt','a') #pause to let everything get warmed up

Scipy.misc.imread flatten argument — converting to grey scale

由 耗尽温柔 提交于 2021-01-28 01:50:21
问题 I'm trying to understand how this method transform an image in grey scale (if it uses a simple mean or a weighted mean) -- I have to reference this method. From the documentation I know that this method calls the convert(‘F’) method. From Pillow/PIL source code, I can find this method, however, I couldn't find what it does when the mode parameter is set to 'F'. Thank you. 回答1: In the docstring of the convert method of the Image object (seen in the code that you linked to), there is this: When

Extract key frames from GIF using Python

由 给你一囗甜甜゛ 提交于 2021-01-27 06:59:29
问题 I want to compress a GIF image by extracting 15 frames from the GIF that preferably should be distinct. I'm using Python and Pillow library and I didn't find any way to get the number of frames a GIF has in the Pillow docs. Neither did I find how to extract a specific frame from a GIF, because Pillow restricts that. Is there any way to extract frames without iterating through each frame consequently? Is there a more advanced Python library for GIF processing? 回答1: For the number of frames,

Extract key frames from GIF using Python

由 拜拜、爱过 提交于 2021-01-27 06:56:53
问题 I want to compress a GIF image by extracting 15 frames from the GIF that preferably should be distinct. I'm using Python and Pillow library and I didn't find any way to get the number of frames a GIF has in the Pillow docs. Neither did I find how to extract a specific frame from a GIF, because Pillow restricts that. Is there any way to extract frames without iterating through each frame consequently? Is there a more advanced Python library for GIF processing? 回答1: For the number of frames,

PIL : PNG image as watermark for a JPG image

由 泪湿孤枕 提交于 2021-01-20 19:42:58
问题 I'm trying to make a composite image from a JPEG photo (1600x900) and a PNG logo with alpha channel (400x62). Here is a command that does the job with image magick: composite -geometry +25+25 watermark.png original_photo.jpg watermarked_photo.jpg Now I'd like to do something similar in a python script, without invoking this shell command externally, with PIL. Here is what I tried : photo = Image.open('original_photo.jpg') watermark = Image.open('watermark.png') photo.paste(watermark, (25, 25)

不用微信QQ，用Pillow裁剪图片

由 安稳与你 提交于 2021-01-20 13:17:11
Pillow 库是python中处理图片最常用的库，我们用 Pillow 来实现一个图片裁剪的功能。 先安装pillow库 pip install pillow 我们要实现的效果如下，随便找一张图，裁剪后的效果图 首先通过 open 方法打开图片，得到一个Image对象 from PIL import Image import requests im = Image . open ( "test.jpg" ) 也可以使用使用网络上的图片URL链接 from PIL import Image import requests img_url = "https://p1-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/bc17b6c57e7c42aa905958a648e8c004~tplv-k3u1fbpfcp-watermark.image" im = Image . open ( requests . get ( img_url , stream = True ) . raw ) Image对象提供了 crop 方法来裁剪图片，只需要指定裁剪的位置 (left, upper, right, lower)，其实就是裁剪后图片的左上角坐标（x1,y1)和右下角的坐标值(x2,y2)，四个值组成的元组 crpim = im . crop ( ( left ,

cannot write mode RGBA as JPEG [duplicate]

由 筅森魡賤 提交于 2021-01-13 03:56:04
问题 This question already has answers here : Convert png to jpeg using Pillow (4 answers) Closed 2 years ago . I am learning to use 'pillow 5.0' following book 'Automate the boring stuff with python' The info about the image object In [79]: audacious = auda In [80]: print(audacious.format, audacious.size, audacious.mode) PNG (1094, 960) RGBA When I tried to convert filetype, it report error. In [83]: audacious.save('audacious.jpg') OSError: cannot write mode RGBA as JPEG There's no such a n error

cannot write mode RGBA as JPEG [duplicate]

由 五迷三道 提交于 2021-01-13 03:53:29
问题 This question already has answers here : Convert png to jpeg using Pillow (4 answers) Closed 2 years ago . I am learning to use 'pillow 5.0' following book 'Automate the boring stuff with python' The info about the image object In [79]: audacious = auda In [80]: print(audacious.format, audacious.size, audacious.mode) PNG (1094, 960) RGBA When I tried to convert filetype, it report error. In [83]: audacious.save('audacious.jpg') OSError: cannot write mode RGBA as JPEG There's no such a n error

Python 十大图像处理工具

由 北城余情 提交于 2021-01-08 18:53:32
作者：Parul Pandey 编译：大数据文摘 本文主要介绍了一些简单易懂最常用的Python图像处理库 当今世界充满了各种数据，而图像是其中高的重要组成部分。然而，若想其有所应用，我们需要对这些图像进行处理。图像处理是分析和操纵数字图像的过程，旨在提高其质量或从中提取一些信息，然后将其用于某些方面。 图像处理中的常见任务包括显示图像，基本操作（如裁剪、翻转、旋转等），图像分割，分类和特征提取，图像恢复和图像识别等。Python之成为图像处理任务的最佳选择，是因为这一科学编程语言日益普及，并且其自身免费提供许多最先进的图像处理工具。 让我们看一下用于图像处理任务的一些常用Python库。 1. scikit Image scikit-image是一个基于numpy数组的开源Python包。 它实现了用于研究、教育和工业应用的算法和实用程序。 即使是对于那些刚接触Python的人，它也是一个相当简单的库。 此库代码质量非常高并已经过同行评审，是由一个活跃的志愿者社区编写的。 使用说明文档： https://scikit-image.org/docs/stable/user_guide.html 用法举例： 图像过滤、 模版匹配 可使用“skimage”来导入该库。大多数功能都能在子模块中找到。 import matplotlib.pyplot as plt %matplotlib
订阅 pillow