PHP Imagecolorsforindex () Function

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Syntax:
array imagecolorsforindex ($image, $index)
Parameters: This function takes two parameters as above and described below:
  • $image:The imagecreatetruecolor() function is used to create an image with a given size. This function creates an empty image of the specified size.
  • $index:this parameter is used to specify the color index.
Return value:this function returns an associative array containing the red, green, blue, and alpha key values ‚Äã‚Äãat the specified index.The following programs illustrate the imagecolorsforindex() functionin PHP: Program 1:
// save the image to a variable. $image = imagecreatefrompng ( https://media.engineerforengineer.org/w p-content / uploads / engineerforengineer-9.png );
// Calculate the rgb pixel value at the percular point. $rgb = imagecolorat ( $image , 30, 25);
// Assign a color name and value. $colors = imagecolorsforindex ( $image , $rgb ); var_dump ( $colors ); ?>
Output:
array (4) {["red"] = > int (34) ["green"] = > int (170) ["blue"] = > int (66) ["alpha"] = > int (0)}
Program 2:
// save the image to a variable. $image = imagecreatefrompng ( https://media.engineerforengineer.org/wp-content/uploads/col1.png );
// index value $index_x = 230; $index_y = 120;
// Calculate the rgb pixel value at the percular point. $rgba_color = imagecolorat ( $image , $index_x , $index_y );
// Assign a color name and value. $colors = imagecolorsforindex ( $image , $rgba_color ); var_dump ( $colors ); ?>
Output:
array (4) {["red"] = > int (97) ["green"] = > int (57) ["blue"] = > int (104) ["alpha"] = > int (0)}
Related Articles:
  • PHP | Imagecolorclosestalpha() Function
  • PHP | imagecolorat() function
Link: http://php.net/manual/en/function.imagecolorsforindex.php

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PHP Imagecolorsforindex () Function iat: Questions

iat

InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately

3 answers

Tried to perform REST GET through python requests with the following code and I got error.

Code snip:

import requests
header = {"Authorization": "Bearer..."}
url = az_base_url + az_subscription_id + "/resourcegroups/Default-Networking/resources?" + az_api_version
r = requests.get(url, headers=header)

Error:

/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/util/ssl_.py:79: 
          InsecurePlatformWarning: A true SSLContext object is not available. 
          This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. 
          For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning

My python version is 2.7.3. I tried to install urllib3 and requests[security] as some other thread suggests, I still got the same error.

Wonder if anyone can provide some tips?

334

Answer #1

The docs give a fair indicator of what"s required., however requests allow us to skip a few steps:

You only need to install the security package extras (thanks @admdrew for pointing it out)

$ pip install requests[security]

or, install them directly:

$ pip install pyopenssl ndg-httpsclient pyasn1

Requests will then automatically inject pyopenssl into urllib3


If you"re on ubuntu, you may run into trouble installing pyopenssl, you"ll need these dependencies:

$ apt-get install libffi-dev libssl-dev

PHP Imagecolorsforindex () Function iat: Questions

iat

Dynamic instantiation from string name of a class in dynamically imported module?

3 answers

In python, I have to instantiate certain class, knowing its name in a string, but this class "lives" in a dynamically imported module. An example follows:

loader-class script:

import sys
class loader:
  def __init__(self, module_name, class_name): # both args are strings
    try:
      __import__(module_name)
      modul = sys.modules[module_name]
      instance = modul.class_name() # obviously this doesn"t works, here is my main problem!
    except ImportError:
       # manage import error

some-dynamically-loaded-module script:

class myName:
  # etc...

I use this arrangement to make any dynamically-loaded-module to be used by the loader-class following certain predefined behaviours in the dyn-loaded-modules...

222

Answer #1

You can use getattr

getattr(module, class_name)

to access the class. More complete code:

module = __import__(module_name)
class_ = getattr(module, class_name)
instance = class_()

As mentioned below, we may use importlib

import importlib
module = importlib.import_module(module_name)
class_ = getattr(module, class_name)
instance = class_()

PHP Imagecolorsforindex () Function iat: Questions

iat

How to get all of the immediate subdirectories in Python

3 answers

I"m trying to write a simple Python script that will copy a index.tpl to index.html in all of the subdirectories (with a few exceptions).

I"m getting bogged down by trying to get the list of subdirectories.

184

Answer #1

import os
def get_immediate_subdirectories(a_dir):
    return [name for name in os.listdir(a_dir)
            if os.path.isdir(os.path.join(a_dir, name))]

We hope this article has helped you to resolve the problem. Apart from PHP Imagecolorsforindex () Function, check other iat-related topics.

Want to excel in Python? See our review of the best Python online courses 2022. If you are interested in Data Science, check also how to learn programming in R.

By the way, this material is also available in other languages:



Ken OConnell

Vigrinia | 2022-12-05

Maybe there are another answers? What PHP Imagecolorsforindex () Function exactly means?. Checked yesterday, it works!

Dmitry Galleotti

New York | 2022-12-05

Maybe there are another answers? What PHP Imagecolorsforindex () Function exactly means?. I am just not quite sure it is the best method

Jan Lehnman

Texas | 2022-12-05

I was preparing for my coding interview, thanks for clarifying this - PHP Imagecolorsforindex () Function in Python is not the simplest one. Checked yesterday, it works!

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