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you use a grind stone
You can select the part of the image you want to sharpen and click on the sharpen tool or you can just click on the sharpen tool and use the brush to sharpen certain areas. thegimpking.blogspot.com
you run the blade slowly over a whetstone.
sing,sail,try to find gold,sharpen swords
You should know the angle of the cutting tool. You can use emery sharp cutting tool.
Eliza Swords's birth name is Eliza Niven Swords.
Shawn Swords's birth name is Shawn Thomas Swords.
That means to sharpen tools to make them sharp. For instance, the ancient civilizations would sharpen spears, to them known as tools, to hunt.
If you're asking what volcanic rock can be sharpened as a cutting tool, the answer is obsidian.
A tool that is used to sharpen the end of a pencil to make writing with it easier.
vikings made there own sawds out of what they found or created, vikings had metals therefor they would make there handal of there sawd then sharpen the blade.
unsharp mask is bad name for filter that is used for sharpening image. It is sharpening tool, people use it to sharpen image details.