Stitching is really easy in photoshop using brushs,
the layers palette and paths
Firstly we need to make our stitch brushes.
I am going to make a straight stitch and a zig zag stitch brush
Our straight stitch is basically a straight line
that is slightly curved on the eges
See fig 1

fig1
Edit- define brush and name your brush ( straight
stitch- or something you recognise)
Now open the image you want to stitch on.
Select your element – modify- reduce the selection till the
selection lies where you want your stitiching to be applied (fig2)

fig2
and then go to the paths palette and select make work path from
selection

fig3
Now go to your brushes and select your new stitch
– in the brushes palette adjust the size and spacing of your
brush to your desired spacing –(fig and
Set the angle in the shape dynamics section to direction

fig4

fig5
Create a new layer for your stitching
Go back to the paths palette and select stroke path with brush

fig6
Add a bevel and a tiny drop shadow to your stitching.
You may like to add some indentations to the “fabric”
I do this by duplicating my stitching layer ( drop it below your
current stitching) – go to blending mode and reduce the fill
opacity to zero – and then create a downwards bevel
To create a zigzag stitch – make
a new brush

use it in the same way – adjusting the spacing and angle to
direction.
And you will have great zig zag stitching

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