MediaBlur - Python media bluring tool

Created on: July 2025

Team Size: 1

Time Frame: 3 days

Tool Used: Python/PyQt

Why ?

I wanted to develop my own tool to be able to blur-out parts of documents without having to rely on web tools or specific softwares that require subscription or payments to access “an Entire World of possibilities” where actually I just needed one specific feature.

How ?

To achieve my little “MediaBlur” tool I used Python’s

Despite the normal Input/Output logic and some GUI features implemented with PyQt. The core principle of this tools is primarly this function:

def apply_blur(self):
        selection = self.media_viewer.get_selection()
        if not self.current_pil_image:
            QMessageBox.warning(self, "No File", "Please open a file first.")
            return
        if not selection:
            QMessageBox.warning(self, "No Selection", "Please select an area to blur by clicking and dragging.")
            return

        # The logic now operates on self.current_pil_image, which is universal
        # The selection coordinates are already scaled correctly because they come from the displayed pixmap
        box = (int(selection.left()), int(selection.top()), int(selection.right()), int(selection.bottom()))
        
        region_to_blur = self.current_pil_image.crop(box)
        radius = self.radius_slider.value()
        blurred_region = region_to_blur.filter(ImageFilter.GaussianBlur(radius=radius))
        
        # Paste the blurred region back onto the master PIL image
        self.current_pil_image.paste(blurred_region, box)
        
        # Update the view with the newly blurred image
        self.display_pil_image(self.current_pil_image)

Basically it takes a rectangle previously created with mouse events in the Qt window and uses the ImageFilter.GaussianBlur() method.

Result

The result is the following. First the interface with a clear image and a selection done:

And finally the same image with the modification applied:

Try it yourself !

If you want to try it, you can download it directly from here, unzip, and launch the .exe

Download "MediaBlur"

Please note that this .exe might fire security warnings. This is a normal behaviour since this little app hasn’t been signed through a Certificate Authority (CA).