Sharpen Filter

Accurate Image Manipulation for Desktops

# Sharpen Filter, 8th Aug 1999

# Description

> Powerful sharpening filter, accurate round-off and calculation in 31 bit integer space.

# Selection Dropdown

> Amount X1, this is the normal setting. Amount 500% is approximately equal to Photoshop USM at amount=500%, radius=0.5 and threshold=0. But it produces better quality especially in the shadows.
> Amount X10, for very low-noise images (and screen captures) there is often a need for for stronger sharpening that the Photoshop USM allows.

# Check Boxes

> 0/255 Inv

> > This is a preview function. When enabled it will give visual feedback for pixels that have channel value 0 or 255. This greatly helps in setting the black-point and white-point accurately. Slowly enable/disable the 0/255 Inv check-box to see the effect.

# Sliders

> Amount, 0....1000%. This is multiplied by 10 when Amount X10 is selected in the drop-down.

# Author

> Timo Autiokari. Homepage: Accurate Image Manipulation for Desktops

# Usage and Distribution Rights

> Free to download and use, distribution is prohibited.

# Filter Engine

> FilterFormula v 1.1, by ATS/Graphics