Image Processing Filters - How to Sharpen a Photograph

Blurry photograph

Do you have a blurry image that you would like to sharpen? Most image editing applications provide an image sharpen function. If you don't already have an image editing application, you can either pay over $100 for Adobe Photoshop, or you can download the free Paint.NET image editing application for Windows.

Pixels Before sharpen algorythm Pixels after sharpen algorythm

Image sharpening works scanning through the pixels of the image and performing a mathematical matrix operation on each pixel. The formula uses the color and intensity of the pixel, along with the color and intensity of the surrounding pixels to calculate how much to increase the contrast of the target pixel.

Paint.NET photo sharpen operation

Adjusting the amount of sharpening sets amount to adjust the contrast, and the size of the area of surrounding pixels to use in the calculation.

Sharp photograph

Be aware that too much sharpening can increase the amount of noise in the image.

Learn more at

More Graphics Design Tips:
• Draw Bezier SVG Drawing Application
• CSS Button Designer
• The Game Maker's Apprentice
• SVG Example Code to Rotate Elements
• The Blender Gamekit
• Animation Software - The Amazing 3D World
• MathML mo Element Operators
• SVG Image Clipping
• Getting Started with Blender
• Inkscape Grouping