To create a barcode in Photoshop, first open a new A4 size project and use the Single Row Marquee Tool to make a small center rectangle. Then add the maximum amount of Gaussian monochromatic noise by selecting the noise filter option and dragging the amount bar. Finally, create a line across the page, transform it, and add random numbers in a text box to complete the basic barcode.

1. To begin with, open a new
project in Photoshop by
selecting the page to be A4 in
size.

2. Next, select the Single Row
Marquee Tool and create a
small rectangle in the
centre of the page.

3. Select the filter option at
the top of the screen and
move the mouse above the
noise option, then select
add noise.

4. Drag the bar for the
amount to the highest
possible option. The
ensure that the Gaussain
option is selected and also
the Monochromatic
option.

5. Then, create a line across
the page and right click to
select the Free Transform
option.

6. Click and drag the line up
and the following lines
should appear.

7. Finally, insert a text box
and include a random
sequence of number and
the barcode is complete.