How to Resize Your Brushes in GIMP 2.8.

Step-by-Step Guide

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   Step 1: Open a new document in Gimp 2.8.6;

   A menu will appear with programmable command options. ,,,,, Repeat the steps above to set the "Cursor Down" to "Decrease Brush Size" and "Cursor Left" to "Decrease Brush Angle"
   
   and finally the "Cursor Right" to "Increase Brush Angle". , Select a brush from the brush options menu and draw a line.
   
   Press and hold the "Up Arrow" on your keyboard.
   
   You should see the hologram of the brush increase in size as you hold down the arrow key.
   
   When the brush is the size you want, release the "Up Arrow" key and draw another line.
   
   This line should be larger than the initial line you drew.
   
   Test each of the four direction keys to familiarize yourself with the new functions. (Don't worry, your arrow keys will only work this way when you are using the Gimp program.)
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   Step 2: Click on "Edit".

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   Step 3: Click on "Preferences" (near the bottom of the drop down menu).

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   Step 4: Click on "Input Controllers" in the left hand menu column.

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   Step 5: Click on "Main Keyboard" in the far right hand column.

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   Step 6: At the bottom of the far right hand column

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   Step 7: click on the first small icon (not the up or down arrows to the right of it).

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   Step 8: Use the scroll bar to move down the list to "Cursor Up" and click on it.

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   Step 9: Click "Edit" just under the scroll box window and a screen will appear with a list of programmable functions listed.

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    Step 10: Select "Increase Brush Size" by clicking on it.

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    Step 11: Click "OK" just under the scroll box menu window.

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    Step 12: Finalize your programming by moving to the "Preferences" window and clicking "OK".

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    Step 13: When you've programmed each of the four keyboard direction arrows

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    Step 14: close the "Preferences" window and check your work in your new document.

Detailed Guide

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