- Open
Photoshop > Preferences > Guides, Grid, Slices & Count...
- In the Grid section, set: Gridline every 10 pixels, subdivisions 10.
- Make sure
View > Show > Grid
is✓
or-
. It seems to be a bug in photoshop, but snapping to grid doesn't work when the grid is enabled but hidden. If you find the grid distracting, you can set it to "Dots" in prefs. - Make sure
View > Snap
is✓
. - Make sure
View > Snap To > Grid
is✓
.
Now, if you show extras (that's View > Extras
or Cmd-H
or maybe Cmd-Ctrl-H
) everything will snap to pixel boundaries.
If you hide extras, some tools will work subpixel.
Note: I run CS3 so I don't know if this still works on CS4 or CS5. It probably does.