When I merge, a binary file conflict,how can I select between 2 versions?

The only way now I know is to replace the file with the version file I want in working copy,and then git add and git commit.I think it is inconvenient.

When I use "git mergetool",it output: ''' Merging the files: binary_example.png

Normal merge conflict for 'binary_example.png':
  {local}: modified
  {remote}: modified
Hit return to start merge resolution tool (meld): 
'''

Then I think if there is some command to select local or remote version file to add more easier,because it is obviously git keep 2 version file.

Does anyone know it?

Thanks!