PHP Imagick haldClutImage () function

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bool Imagick::haldClutImage ($clut, $channel)
Parameters:this function takes two parameters as above and described below:
  • $clut:this parameter is used to store the value of the Imagick object containing the Hald search image .
  • $channel:This parameter provides a channel constant that is valid for channel mode. More than one channel can be combined using the bitwise operator. The default channel in the Imagick function is Imagick::CHANNEL_DEFAULT.
Return value:This function returns True on success.Errors / Exceptions:This function will throw a exceptionImagickException on error.Original Image:
The following program illustrates the Imagick::haldClutImage()function in PHP:Program 1:
// require_once (’ path / vendor / autoload.php ’);
// Create new Imagick objects $imagick = new Imagick ( realpath ( ’img / engineerforengineer.png’ )); $imagickPalette = new Imagick ( realpath ( " img / engineerforengineer.png " ));
// Use sepiatoneImage and haldClutImage functions $imagickPalette -> sepiatoneImage (50); $imagick -> haldClutImage ( $imagickPalette );
// Image title header ( "Content-Type: image / jpg" );
// Display the output image echo $imagick -> getImageBlob(); ?>
Output: Program 2:
// require_once (’ path / vendor / autoload.php ’);
// Create a new Imagick object $imagick = new Imagick ( ’img / engineerforengineer.png’ ); $imagickPalette = new Imagick ( "img / engineerforengineer.png" );
// Using the haldClutImage function $imagickPalette -> sepiatoneImage (150); $imagick -> haldClutImage ( $imagickPalette );
// Write an output image $imagick -> writeImage ( ’raiseImae1.png’ );
// Destroy Imagick $imagick -> destroy(); ?>
Output: Link:

PHP Imagick haldClutImage () function iat: Questions


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)


          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

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?


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


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
      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...


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_()


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.


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))]

PHP Imagick haldClutImage () function PHP: Questions


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