アンシャープマスク
1 2 4.9. Unsharp Mask, esp. 4.9.4. How does an unsharp mask work?, Gimp documentation.
↑ Guide to Image Sharpening, Cambridge in Color.
1 2 Local Contrast Enhancement, Cambridge in Color.
↑ Understanding Local Contrast Enhancement, The Luminous Landscape.
Template:More citations needed