Use the Divide Slice dialog box to divide
slices horizontally, vertically, or both. Divided slices are always
user slices, regardless of whether the original is a user slice
or an auto slice.
Note: You cannot divide layer-based
slices.
Select one or more slices.
With the
Slice Select tool selected, click Divide in the options bar.
Select Preview in the Divide Slice dialog box to preview
the changes.
In the Divide Slice dialog box, select one or both of
the following options:
Divide Horizontally Into
Divides the slice lengthwise.
Divide Vertically Into
Divides the slice widthwise.
Define how you want to divide each selected slice:
Select and enter a value for Slices Down
or Slices Across to divide each slice evenly into the specified
number of slices.
Select and enter a value for Pixels Per Slice to
create slices with the specified number of pixels. If the slice
cannot be divided evenly by that number of pixels, the remainder
is made into another slice. For example, if you divide a slice that is
100 pixels wide into three new slices each 30 pixels wide, the remaining 10‑pixel‑wide
area becomes a new slice.