Bạn cũng có thể chèn văn bản thay thế thay vì một hình ảnh. Khi bạn thêm hình ảnh, thẻ được chèn vào giữa mở và đóng thẻ. Để xác định một hình ảnh và văn bản thay thế, chèn hình ảnh đầu tiên, Và một yếu tố rất quan trọng là tốc độ bus. Điều này đề cập đến các tốc độ truyền dữ liệu từ bộ nhớ RAM đến CPU (đơn vị xử lý trung tâm, tức là các chip). | Martin Evening Adobe Photoshop CS3 for Photographers Determining output image size Image size is determined by the final output requirements and at the beginning of a digital job the most important information you need to know is How large will the picture appear on the page poster etc. What is the screen frequency being used by the printer - how many lpi What is the preferred halftone factor used to determine the output resolution Will the designer need to allow for page bleed or want to crop your image But we always use 300 ppi There is a common misconception in the design industry that everything must be supplied at 300 pixels per inch. This crops up all the time when you are contacting clients to ask what resolution you should supply your image files at. Somehow the idea has got around the industry that everything from a picture in a newspaper to a 48-sheet poster must be reproduced from a 300 ppi file. It does not always hurt to supply your files at a higher resolution than is necessary but it can get quite ridiculous when you are asked to supply a 370 MB file in order to produce a 30 x 36 print with which to generate the black plate. The spacing of the pixels in relation to the spacing of the 45 degree rotated black plate is thereby more synchronized. For this reason you will find that the image output resolution asked for by printers is usually at least times the halftone screen frequency used . multiples of or x2. This multiplication is also known as the halftone factor but which is best Ask the printer what they prefer you to supply and some will say that the 1 or 1 multiplication produces crisper detail than the higher ratio of 2 1. There are other factors which they may have to take into account such as the screening method used. It is claimed that Stochastic or FM screening permits a more flexible choice of ratios ranging from 1 1 to 2 1. Ideally this information needs to be known before the image is scanned or captured .
