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Adobe Photoshop CS4 for Photographers phần 10

Từ khóa bảng điều khiển hiển thị các thông tin tích lũy mà nó đã đọc từ siêu dữ liệu của tập tin hình ảnh khác nhau và cũng có thể được sử dụng để viết các từ khóa siêu dữ liệu trở lại các tập tin. Các từ khóa khác Khi bạn nhập từ khoá thông qua bảng điều khiển File Thông tin, bất kỳ từ khoá là không được công nhận sẽ xuất hiện liệt kê theo thể loại: Khác Từ khóa '. | Chapter 13 Print output Judge the print not the monitor It is difficult if not impossible to judge how much you should sharpen an image for print output by looking at the monitor. Even if you reduce the viewing size to 50 or 25 what you see on the screen will bear no resemblance to the final print output. The ideal print output sharpening can be calculated on the basis that at a normal viewing distance the human eye resolves detail to around 1 100th of an inch. So if the image you are editing is going to be printed from a file with a resolution of 300 pixels per inch the edges in the image will need a 3 pixel Radius if they are to register as sharp in print. When an image is viewed on a monitor at 100 this kind of sharpening will look too sharp and quite ugly because you are viewing the image much closer up than it will actually be seen in print but the actual physical print should appear nice and sharp. So based on the above formula images printed at lower resolutions will require a smaller pixel radius sharpening and those printed at higher resolutions will require a higher pixel radius sharpening. Now different print processes and media types will require slight modifications to the above rule but essentially output sharpening can be distilled down to a set formula for each print process resolution media type. This was the basis for the research carried out by Bruce Fraser and Jeff Schewe when they devised the sharpening routines used for Photokit Sharpener see sidebar . High Pass filter edge sharpening technique The technique described on pages 614-615 shows an example of just one of the formulas used in the Photokit Sharpener product for output sharpening. In this case I have shown Bruce Fraser s formula for sharpening a typical 300 pixel per inch glossy inkjet print output so make sure you have resized the image to the exact print output dimensions and at a resolution of 300 pixels per inch beforehand. You will notice that it mainly uses the High Pass filter