er ’ s M a n u a l Ta b l e O f C ont ents Chapter 31: Edge-Detect Filters................................... 485 Introduction 486 Edge 486 Laplace 487 LoG 487 Sobel 489 Chapter have only to leaf through the Gallery chapter in this book. OLOF S. KYLANDER Olof is a UNIX and network system administrator. He received his formal computer education at the Chalmers University of Technology been configuring various UNIX systems and networks ever since. Olof currently works for the UNIX/Network consulting company Sigma-nbit in Gothenburg, and is presently occupied with configuring Solaris servers

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 457 15.5 Edge-Detect Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 459 15.5.3 Edge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . change the solution, though.) If the eye symbol does not appear, click in the Layers dialog at the left edge to toggle it: this should make the layer visible. See the Help section for the Layers Dialog if you

Rectangle Select tool, and then toggle QuickMask. You will now see that the clear rectangle has a fuzzy edge. Feathering is particularly useful when you are cutting and pasting, in helping the pasted object tiles. A pattern is said to be tileable if copies of it can be adjoined left-edge-to-right-edge and top-edge-to-bottom-edge without creating obvious seams. Not all useful patterns are tileable, but tileable were really present but impair the quality of the image, such as a telephone wire running across the edge of a beautiful mountain landscape. Despeckling A good tool for removing dust and other types

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 748 17.8 Edge-Detect Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 749 Difference of Gaussians . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750 17.8.3 Edge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 751 17 Free Select Tool • The “Intelligent Scissors Select tool” lets you select a freehand border and uses edge-recognition algorithms to better fit the border around the object. Use this when the subject is complex

only store image in 256 colours. Renowned for its ability to store animations. PNG Portable Network Graphics Provides better lossless compression than BMP and GIF. TIF (or TIFF) Tagged Image