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How to save a PNG image server-side, from a base64 data string
...Exception('did not match data URI with image data');
}
file_put_contents("img.{$type}", $data);
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How can I convert an RGB image into grayscale in Python?
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How about doing it with Pillow:
from PIL import Image
img = Image.open('image.png').convert('LA')
img.save('greyscale.png')
Using matplotlib and the formula
Y' = 0.2989 R + 0.5870 G + 0.1140 B
you could do:
import numpy as np
import matplotlib.pyplot as plt
import matpl...
How to extract img src, title and alt from html using php? [duplicate]
... that case it's better to split the process into two parts :
get all the img tag
extract their metadata
I will assume your doc is not xHTML strict so you can't use an XML parser. E.G. with this web page source code :
/* preg_match_all match the regexp in all the $html string and output everythi...
C++对象布局及多态探索之菱形结构虚继承 - C/C++ - 清泛网 - 专注C/C++及内核技术
...|m1 |
(注：为了不折行，我用了缩写。ospt代表偏移值指针、m代表成员变量、vtpt代表虚表指针。第一个数字是该区域的大小，即字节数。只有偏移值指针有第二个数字，第二个数字就是偏移值指针指向的偏移值的大小。)
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How can one display images side by side in a GitHub README.md?
...side by side if the images are not too wide.
<p float="left">
<img src="/img1.png" width="100" />
<img src="/img2.png" width="100" />
<img src="/img3.png" width="100" />
</p>
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C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术
C语言结构体里的成员数组和指针单看这文章的标题，你可能会觉得好像没什么意思。你先别下这个结论，相信这篇文章会对你理解C语言有帮助。这篇文章产生的背景是在微博上，...单看这文章的标题，你可能会觉得好像没什么...
How to close tag properly?
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<img src='stackoverflow.png' />
Works fine and closes the tag properly. Best to add the alt attribute for people that are visually impaired.
shar...
Convert SVG to image (JPEG, PNG, etc.) in the browser
... calls to output a png
var canvas = document.getElementById("canvas");
var img = canvas.toDataURL("image/png");
// do what you want with the base64, write to screen, post to server, etc...
});
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总结const_cast、static_cast、dynamic_cast、reinterpret_cast - C/C++ - ...
...C类型转换类似，不检查类型来保证转换安全。也可用于指针的父类到子类的...简单总结：
1) const_cast：移除const属性。
2) static_cast：强转，与C类型转换类似，不检查类型来保证转换安全。也可用于父子类指针的向上转换。
3) dy...
Convert RGBA PNG to RGB with PIL
...95/…). I had to convert the PNG to RGBA first and then slice it: alpha = img.split()[-1] then use that on the background mask.
– joehand
Nov 2 '12 at 0:56
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