Cannot disable texture mipmap

I unchecked mipmaps, but my whale still have filtering, how to make it pixelized? Thanks

Linux mint 18 64 bit KDE
blender 2.78 download from steam
CPU i7 3770
ram 8 Gb
no gpu

Hi Kevin,

if you are in blender internal render maybe uncheck interpolation in texture options in your scene ( texture> Image sampling > interpolation ) and not in OGL options for viewport. Then it should work in render preview.