TAILIEUCHUNG - Adobe Photoshop 7.0 for Photographers- P2

Adobe Photoshop for Photographers- P2: In 1996, a group of self-proclaimed ‘digital’ photographers met together at Ian McKinnell’s studio in Holborn, London, to discuss the formation of a Digital Imaging Group. At first, this was a small gathering of professional photographers. The one thing we all had in common was a shared interest in using computers and their potential as a photographic medium of the future. | Adobe Photoshop for Photographers ages such as custom shape tools and layer clipping paths. This raises some interesting possibilities - with Photoshop you can create various graphical elements like type shape layers layer clipping paths which are all resolution-independent. These vector elements can be scaled up in size in Photoshop without any loss of detail just as you can with an Illustrator graphic. Figure Digital images are constructed of a mosaic of pixels. Because of this a pixel-based digital image always has a fixed resolution and is said to be resolution-dependent . If you enlarge such an image beyond the size at which it is meant to be printed the pixel structure will soon become evident as can be seen in the right-hand close-up below. But suppose the picture shown opposite was created not as a photograph but as an illustration in a program like Adobe Illustrator . If the picture is drawn using vector paths the image will be resolution-independent. The mathematical numbers used to describe the path outlines shown in the bottom left example can be scaled to reproduce at any size from a postage stamp to a billboard poster. Photograph Eric Richmond. 30 Please purchase PDF Split-Merge on to remove this watermark. Resolution Terminology Before proceeding further let me help clarify a few of the confusing terms used and their correct usage when describing resolution. ppi pixels per inch. Describes the digital pixel resolution of an image. You will notice the term dpi is often inappropriately used to describe digital resolution. Scanning devices are sometimes advertised with their scanning resolution expressed in dots per inch. Strictly speaking this is an incorrect use of the term dpi because input devices like scanners produce pixels and only output printers produce dots. However it s fallen into common parlance and unfortunately only added to the confusion. Photoshop always refers to the input resolution as being in pixels per inch .

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