tailieunhanh - Adobe Photoshop 7.0 for Photographers- P6

Adobe Photoshop for Photographers- P6: 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 Figure Curves corrections can be exactly the same as making a Levels adjustment. In this example the two ends of the curve have been dragged in as you would in Levels in order to set the optimum shadow and highlight points. You can control both the lightness and the contrast of the image by adjusting the shape of the curve. Click on the bottom right box to enlarge the curves dialog as shown below. Figure If you click on the horizontal output ramp the curve point readouts will be displayed using density percentages when in RGB and ink percentages when in CMYK. The curve is also reversed in CMYK with the shadow point in the top right corner and the highlight point in the bottom left. If you Option Alt-click anywhere inside the grid area the grid units will switch from 25 to 10 increments. For example Chapter Fourteen shows how coloring effects can be achieved through individual channel curves adjustments. The default RGB units are measured in brightness levels from 0 to 255. CMYK curves are by default displayed differently click on the horizontal output ramp to toggle between displaying with levels or ink percentage readouts . This alternate mode see Figure is designed for repro users who primarily prefer to see the output values expressed as ink percentages. The next example shows how you adjust the curve to both improve image contrast and correct the color balance at the same time. Providing the monitor has been correctly calibrated this can all be judged by eye on the screen. Please purchase PDF Split-Merge on to remove this watermark. Color adjustments I The photograph shown here lacks detail in the shadows. The information is there but in its current state the hair will print too dark. We don t want to lighten all of the photograph otherwise the mood in the original picture will become lost. Choose Image Adjustments Curves. The dialog box contains a line on a graph on which you can remap the image