Adobe Photoshop 7.0 for Photographers- P6

Adobe Photoshop 7.0 for Photographers- P6: In 1996, a group of self-proclaimed ‘digital’ photographers met together at IanMcKinnell’s studio in Holborn, London, to discuss the formation of a DigitalImaging 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 andtheir potential as a photographic medium of the future.
Nội dung trích xuất từ tài liệu:
Adobe Photoshop 7.0 for Photographers- P6 Adobe Photoshop 7.0 for Photographers Figure 9.6 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 9.7 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 bright- ness 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 read- outs). This alternate mode (see Figure 9.7) 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 cor- rectly calibrated, this can all be judged by eye on the screen. 230Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Color adjustments 1 The photograph shown here lacks detail in the shadows. The information is there but in its cur- rent 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 tones. Identify which portion of the curve needs adjustment by mous- ing down in the image area (such as on the darker areas of the hair) and watch where the circle appears on the curve. 2 Click on the curve line to anchor both the midpoint and the highlights. Now refer back to stage one which helped you determine where to add a point on the shadow end of the curve, click on the curve and drag upwards to lighten. The line bends to form a smooth curve and the 3 In this corrected version the midtone and high- shadows are made lighter. Precise positioning of light tone values remain unaltered, while the the curve anchor points is achieved by using shadow detail has been lifted.You can always use either the keyboard arrow keys or entering Curves in this way to exert fine control over the numeric values in the Input and Output boxes lightening or darkening at precise points on the below. tonal scale. Client: Schwarzkopf Ltd. Model: Maria at M&P. There is also a more precise way of correcting the color balance. If you exploit the fine tuning capabilities built into the Curves dialog and combine this with the use of the color sampler tool, you can correct with absolute precision. Repro professionals will often rely more on the numeric readouts to judge the color in a digital image. 231Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Adobe Photoshop 7.0 for Photographers 1 The above photograph has a cold color cast. This is particularly noticeable in the backdrop, which should be a neutral gray. If I want to cor- rect the color in this picture, the best method is to apply a curves image adjustment. Go to the Image > Adjustments menu and choose Curves... 2 This shows you the curves corr ...