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Bram from Sweetbeat.be tells you how he got the rainbow in the photo above using photoshop :
- Open new document 20x20cm.
- Make a new layer and select it.
- Select the pen tool en draw a bowed line.Make sure when you have the pen tool selected to have the paths icon selected and not shape layers or fill pixels
- I select the brush tool and on the top right-end corner of the window I open the brush menu (brushes).
- Select a hard basic brush of 28px and at the lower part of the window you put spacing on 1%.
- On the top left-end corner in same the window I choose ” Shape dynamics “.
- I ensure that the size jitter, angle jitter, roundness jitter stands on 0%.
- At size jitter I put the control on fade, give in the number 400 and choose 10% minimum diameter (dependent of the size of the document you must play with this).
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- Now I select the pen tool.
- Click rightbutton and choose stroke path.
- As tool I take the brush and click on ” ok “.
- Click your right button again and choose ” delete path ” and voila.
Now you can change the colour with the blending options and for a rainbow duplicate the layer, rotate them a bit but make sure that they start all from 1point if you put them under each other
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Repeat the process with a colorful approach, cut the layers borders.

More tutorials :
Add textures to an image for a dramatic effect in photoshop tutorial.

How to draw an ‘Asian Sun’ with photoshop.
How to draw custom 3-D arrows in photoshop
