潮流风景设计 - PS风景壁纸 1920*1200

本专辑提供 1024*768 | 1280*800 | 1280*1024 | 1440*900 | 1600*1200 | 1680*1050 | 1920*1200 | 7种尺寸桌面壁纸下载

与过去的胶片暗房相比，数字后期的处理要方便得多，效果也要好得多。胶片在暗房时要靠显影、定影的时间和曝光的时间的长短来把握照片的明暗，如果要处理部分的明暗，就是在冲扩时对部分相纸进行遮挡。而数码后期，就可以动动鼠标就解决了。目前进行数码后期调整的软件有很多，但是用得比较广泛的、比较好用的应该还是photoshop，简称PS。虽然有一些象“光影魔术手”之类的傻瓜调整软件，但是与PS相比，功能要弱得多。PS功能的强大应该说可以达到“只有想不到，没有做不到”的效果。

Photo manipulation is the technique of modifying a photographic image by either analog or digital means.

In digital manipulation, photographs are usually taken with a digital camera and input directly into a computer. If a digital camera is not available, a printed photograph may be digitized using a scanner. Photos can also be obtained from stock photography databases. With the advent of computers, graphics tablets, and digital cameras, the term photo manipulation encompasses everything that can be done to a photo in a darkroom or on a computer. A photo manipulation is most commonly subtle (eg alterations to colouring, contrast, so forth), but may be explicit also (eg overlaying a head onto a different body, changing a sign's text). Sometimes a photo manipulation has little or no resemblance to the photo from which is started. Image manipulation software is then used to apply effects and warp the image in whatever way possible until the desired result is achieved.

Before computers, photo manipulation was done by retouching with ink, double-exposure, piecing photos or negatives together in the darkroom or scratching Polaroids. Photo manipulation is as old as photography itself; the idea of a photo having inherent verisimilitude is a social construct. Manipulation has been used to deceive or persuade viewers, or for improved story-telling and self-expression. As early as the American Civil War photographs were published as engravings based on more than one negative.