How do I loop through every 4th pixel in every 4th row using Python

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Certainly! Looping through every 4th pixel in every 4th row is a common task in image processing and analysis. In Python, you can achieve this using nested loops and the indexing properties of arrays (assuming you're working with images as arrays). Here's a step-by-step tutorial with a code example using the popular image processing library, Pillow:
If you haven't installed Pillow yet, you can do so using pip:
Load the image using Pillow's Image.open() method:
Retrieve the width and height of the image:
Now, let's iterate through every 4th row and every 4th pixel within that row:
This code uses the getpixel() method to retrieve the RGB value of each pixel at the specified coordinates. You can replace the print statement with any custom logic based on your specific requirements.
If you make any changes to the pixels, you might want to display or save the modified image. For example, if you want to grayscale every 4th pixel in every 4th row:

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