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it can be quite hard in a photo to tell

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if that horizon is curving now in this

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photo the horizon looks fairly straight

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but there's maybe a slight curve but how

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can we tell it as an actual curve there

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or not well what I like to do first is

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increase the contrast with the levels

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tool in Photoshop I just bring in either

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end of the levels until the horizon gets

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nice and sharp like about there seems

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good it looks pretty sharp over there

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now you can already see there's a bit of

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a problem here because this is land over

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here and there's possibly some clouds

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over here but we've got a clear bit of

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that the ocean over here it's better to

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do with the full ocean side to side but

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let's see what we get with this so we've

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got a contrast enhanced image now what

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I'm going to do is use the marquee tool

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to just select a small segment around

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the horizon and you can already kind of

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see that it's going to going up here and

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then down over here but again you know

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this Hills over here so it's hard to

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tell so I'm going to do now is a copy

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and paste this here so I'll do a control

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C control V and that'll make a copy I'm

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going to move that down so as you can

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see both images at the same time and

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then I'm going to use the free transform

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tool which will allow me just simply to

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stretch it vertically I take the whole

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image stretch it vertically and this is

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just in preview mode so to Pixley but

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when I double-click on it it will render

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it out and you can see any kind of curve

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more exactly now it looks kind of like

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it's pixelated but that's just because

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all the pixels have been stretched

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vertically to maybe like get over 10

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times the normal size so here's the

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original line here and here is the

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vertically stretch one which is simply

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magnifies any existing curve it can't

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actually create a curve because it's

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just a linear transform now this has a

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land over here so it's not that good so

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let's look at another image which is a

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bit better in terms of having more

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oceans it's got ocean over here it's

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been a cloud in the middle and ocean

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over here so let's see how this one

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turns out we're gonna do the same thing

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as before we use the levels tool and we

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just bring in either end of the levels

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to try

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enhance the contrast on the horizon and

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again you see we've got a problem here

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because it's a lounge but here's a curve

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going down over here let's just make

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that a little bit more contrasting and

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all righty

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and again use the marquee tool select

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this small segment here and cut and

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paste bring it down and then free

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transform stretch it out and there you

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can see a quite palpable curve you see

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some landmasses over here maybe this so

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then what this is Island over here but

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as it curves ideally what you want is to

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get a distant ocean horizon viewed from

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about 400 feet which gives you about 25

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miles which is on a good clear day

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should give you a clearer horizon and

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and ideally it would be backlit with the

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Sun behind it and really ideally you'd

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want to get it with the Sun perhaps

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below the horizon maybe you want to get

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that horizon as clear as possible and

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then you want to do this stretch it out