undo memory. Most filters are examples of this: because they are implemented by plug-ins, the GIMP core has no really efficient way of knowing what they have changed, so it has no way to implement Undo actions performed by plugins or scripts, can be undone just like actions implemented by the GIMP core, but this requires them to make correct use of GIMP's Undo functions. If the code is not correct by writing a small plugin than by modifying the huge mass of complex code that makes up the GIMP core. Many valuable plugins have C source code that only comes to 100-200 lines or so. Several dozen

long been exceeded, and yet still the dam held. And then it happened. Common LISP messily dumped core when it could not allocate the 17 MB it needed to generate a parser for a simple grammar using yacc went into feature freeze in October 1997. This meant that no new features would be added to the Gimp core libraries and program. GUM version 0.5 was also released early in October 1997. The developing work Right-click|Select|Sharpen removes the fuzziness on the edges of a feathered selection, leaving a sharp-edged core. Sharpen will not restore any edge detail to a feathered selection, however. Use Sharpen when you

operations that may consume a lot of undo memory. Most filters are implemented by plug-ins, so the GIMP core has no efficient way of knowing what changed. As such, there is no way to implement Undo except by other actions performed by plugins or scripts, can be undone just like actions implemented by the GIMP core, but this requires them to make correct use of GIMP’s Undo functions. If the code is not correct, moment. A point of interest is that multi-threading happens through GEGL processing, but also in GIMP core itself, for instance to separate painting from dis- play. 144 CHAPTER 12. ENRICH MY GIMP 12.1. PREFERENCES

undo memory. Most filters are examples of this: because they are implemented by plug-ins, the GIMP core has no really efficient way of knowing what they have changed, so it has no way to implement Undo other actions performed by plugins or scripts, can be undone just like actions implemented by the GIMP core, but this requires them to make correct use of GIMP’s Undo functions. If the code is not correct, GIMP by writing a small plugin than by modifying the huge mass of complex code that makes up the GIMP core. Many valuable plugins have C source code that only comes to 100-200 lines or so. Several dozen plugins