Centro Concetti e Guide
Sfocatura e Pixelatura di Immagini per Tutela della Privacy
Sfocatura e Pixelatura di Immagini per Tutela della Privacy
Questo strumento opera al 100% lato client nel browser. Immagini, video, file audio o documenti PDF non vengono mai caricati su server remoti; tutta l'elaborazione avviene in totale sicurezza nella memoria locale del dispositivo.
Architettura di Base e Formula Matematica
Pixelation = Average(RGB values in NxN block) → Fill block with single color
Pixelation works by dividing the selected region into a grid of NxN pixel blocks (where N is the intensity/block size). For each block, the average red, green, and blue values of all pixels within that block are computed, and the entire block is then filled with that single averaged color, destroying all fine detail.
Migliori Pratiche e Linee Guida Essenziali
- Use Pixelation Over Blur for Maximum Security: Gaussian blur is mathematically reversible under certain conditions (deconvolution attacks). Pixelation at high intensity (block size ≥ 15px) permanently destroys information and is considered forensically irreversible.
- Extend the Selection Beyond the Target: When redacting faces or text, draw your selection rectangle 10-15% larger than the target area. This prevents edge pixels from leaking identifiable information like hairlines, jawlines, or partial characters.
- Verify at Full Resolution: Always zoom to 100% after applying the blur to confirm that the redacted region is truly unreadable. At thumbnail sizes, insufficiently blurred text can still be deciphered by determined observers.
- Save and Re-open to Confirm Permanence: After downloading the redacted image, re-open it in an image viewer to verify the blur is baked into the pixel data and not just a visual overlay.
Domande Frequenti (FAQ)
Can someone reverse the blur and recover the original information?
Pixelation at sufficient intensity (block size ≥ 10px) is considered irreversible because it permanently averages and replaces pixel data. Gaussian blur is theoretically reversible via deconvolution for very low blur radii, but at the intensities this tool uses (5px+), recovery is practically impossible.
Can I blur multiple areas in the same image?
Yes. Each rectangle you draw is added to a cumulative list. You can blur faces, license plates, and addresses in a single image before downloading. Use 'Undo Last' to remove the most recent selection or 'Clear All' to start over.
What is the difference between Pixelate and Blur mode?
Pixelate replaces groups of pixels with solid color blocks, creating the classic 'mosaic' censorship effect. Blur applies a Gaussian convolution that smoothly smears pixel values, creating a frosted glass effect. Both effectively obscure content.
Does the tool modify my original image file?
No. The tool loads a copy of your image onto an HTML5 Canvas element. The original file on your device is never modified. You download a new, separate file with the redactions applied.