Updated Jetty Photo edit
If I am already in photoshop, then I tend to cut and paste the image (or turn the background into a layer) and then use the transform tool.
Whilst transforming, bring the edge of the window up to the horizon to check what you're doing.
In the case of this image the horizon is also bowing upwards. one way to correct this is rotate the canvas 90 degrees, then use the filter - distort - shear to push the horizon back to a straight line, then rotate the canvas back again.
or you could use lens correction or liquify.
Lovely image - worth getting right.
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Plymouth Photographer

Pentax K10 + Pentax 18-55 + Sigma 28-135 + 50-500 + a large bagful of accessories.
I'm not young enough to know everything



Draken
15 yearsMember
http://www.drakfoto.se
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Pentax K10D (soon to be K7 I hope)
Pentax SMCP-FA 50mm f/1.4
Sigma 17-70/2,8-4,5 DC Macro
Karl Zeiss Jena S 135mm 3.5
MC Zenitar 2.8 16mm Fish Eye
Pentax-M SMC 28mm 2.8
Asahi Pentax 500mm 8.0