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Re­flec­tions also present op­por­tu­ni­ties for some fan­tas­tic post-pro­duc­tion ef­fects. Th­ese in­clude tak­ing one shot at night and one dur­ing the day, from ex­actly the same po­si­tion, of a half-wa­ter or half-land, half-sky lo­ca­tion. This gives you a sim­ple, straight-line cut in the cen­tre of the im­age, en­abling you to re­move one half of the day shot and re­place it with the cor­re­spond­ing half of the night shot. This can be per­formed by adding the night photo to the day photo as a sec­ond layer in Pho­to­shop El­e­ments, then us­ing the line sep­a­rat­ing land and sea as a guide and cut­ting out the top layer us­ing lay­ers and masks; or the shots can be com­bined in a more sub­tle man­ner, by blend­ing the two source photographs ver­ti­cally across the fi­nal im­age, as shown in our cityscape here.

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