Problem with brush size

[lazy_queen666]

So i've been having this issue with brush siezes. I want to use the pizel brush in size 2 but it looks just like brush 3. I need a 2x2 bursh not 3x3 or 1x1. Does anyone know how to fix this issue?

[rich2005]

There are two issues here. 

First the size and a peculiarity of a parametic, (.VBR)  brush is the odd 1 : 3 : 5 sizes.  Then there is the brush tool which introduces anti-aliasing around adjoining pixels to give the impression of smoothness. For no antialising and hard edges use the pencil tool instead of the brush tool.

For 1 , 2 , 3, .... size brushes you can easily make your own tiny brushes. see: https://www.gimp.org/tutorials/Custom_Brushes/

The required size , grayscale , fill with black and export as a .gbr (gimp brush) to your brushes folder.  In use these take the FG colour. This is not new, going back to older versions of Gimp there are sets of same-shape brush in different sizes.

As an example, made a set of 4  (attached, unzip, put in your brushes folder)

   

Do not resize as a brush, anti-aliasing is introduced. Use at their default size.
Using the pencil tool, you can get away with just the 1x1 brush, that does resize keeping hard edges.