Sử dụng photoshop cs5 part 45 doc

ptg 268 Chapter 16 Using the Match Color command You can use the Match Color command to match the color saturation and brightness of one layer or docu- ment to those of another layer or document, and to remove color casts. is would be useful, say, for unifying a series of related product photos that were shot with slightly dierent camera settings or light- ing conditions. For the best results, use this com- mand on images of the same or very similar content (e.g., beach scenes, indoor fashion or product shots). To correct color by using the Match Color command: 1. Open an RGB document to be used as the source for color and tonal values, and an RGB document to become the target of the color match. A–B 2. Optional: Display the Histogram panel so you will be able to monitor tonal changes in the le. 3. With the target document active, on the Layers panel, click the Background, press Ctrl-J/Cmd-J to duplicate it, and keep the duplicate selected. 4. Choose Image > Adjustments > Match Color. In the dialog, check Preview ( A , next page). 5. From the Source menu, choose the name of the source document that you opened in step 1. e target document will instantly adopt color values from the source document. Note: If the source document contains multiple layers, choose a source layer (or Merged) from the Layer menu. 6. Under Image Options, do any of the following: Move the Luminance slider to adjust the overall brightness of the image (the default value is 100). Move the Color Intensity slider to adjust the color saturation (the default value is 100). Move the Fade slider to restore some of the original color to the image, if you want to blend the old with the new. Check Neutralize to remove any color casts from the target document. If this causes too great a color shift, lessen the eect via the Fade slider. 7. Readjust any of the sliders as needed, then click OK ( B , next page). ➤ To limit the range of colors that are used as source data (and to help prevent odd color shifts), create a selection in the source document before opening the Match Color dialog, then in the dialog, check Use Selection in Source to Calculate Colors. A We will correct the orange cast in this photo… B …by matching it to the more balanced color and tonal values of this photo. ptg Retouching 269 B Now the color and tonal values in this image are similar to those in gure B on the preceding page. If we were to import them into the same layout document, they would look harmonious together. A In the Match Color dialog, from the Source menu, we’ve chosen the image that contains the desired color values. REMOVING A COLOR CAST IN THE SAME DOCUMENT ➤ To correct the color in a docu- ment without using another docu- ment as source data, choose None as the Source image in the Match Color dialog and check Neutralize. Use the Luminance, Color Intensity, and Fade sliders, as needed. This method doesn’t work in every case, but when it does, it’s a good quick fi x. ➤ To reuse your Match Color set- tings, click Save Statistics and use the Save dialog to choose a location for the data fi le. To load your saved settings, click Load Statistics. ptg 270 Chapter 16 Using the Replace Color command By using the Replace Color command, you can adjust the hue, saturation, or lightness of colors in specic areas of an image using selection and color controls in a dialog. is command works best for recoloring discrete areas that are easy to isolate. To use the Replace Color command: 1. Optional: For an RGB document that you’re going to send to a commercial printer, choose View > Proof Setup > Working CMYK to view a soft proof of the image in simulated CMYK color. Once you’ve made a choice from the Proof Setup submenu, you can toggle the proof on and o while the Replace Color dialog is open by press- ing Ctrl-Y/Cmd-Y. Regardless of whether the proof is on or o, the Color and Result swatches in the Replace Color dialog always display in RGB. 2. Click a layer (not a Smart Object layer) or the Background. 3. Optional: Create a selection to conne the color replacement to a specic area. A 4. Choose Image > Adjustments > Replace Color. e Replace Color dialog opens. 5. In the document, click the color to be replaced. e color you clicked appears in the Color swatch at the top of the dialog. B 6. Do any of the following: To add more color areas to the selection, click the Eyedropper tool in the dialog, then Shift-click or drag in the preview or document window. Increase the Fuzziness value to add similar colors to the selection, or reduce it to narrow the range of selected colors. Check Localized Color Clusters to limit the selection to similar, contiguous colors. (We sometimes get similar or better results by lowering the Fuzziness value instead.) 7. If you added colors to the selection that you now want to subtract, with the Eyedropper tool, Alt-click/Option-click or drag in the preview or document window (this is a temporary Subtract from Sample Eyedropper tool). ➤ For the preview window, click Selection to view the current selection, or Image to dis- play the entire document. To toggle between the two display modes, press Ctrl/Cmd, then release. A We want to recolor the purple eyeshadow in this image. We loosely selected that area rst. B We opened the Replace Color dialog, then clicked the pot of eyeshadow. Areas matching that color displayed as a selection in the preview window. Our next step was to choose a Fuzziness value of 86. ptg Retouching 271 8. To replace the colors you have selected, do either of the following: In the Replacement area, choose replacement Hue, Saturation, and Lightness values (you can use the scrubby sliders). e Result swatch will update as you do this. A Note: A Saturation value greater than +25 may produce a non- printable color. Click the Result swatch, choose a color from the Color Picker, then click OK. e sliders will shift to reect the values of the new color. Note: e Replacement sliders will stay put, even if you click a dierent area of the image or add to or subtract from the selection. 9. Click OK. B (For another use of this command, see page 274.) ➤ e Replace ment sliders won’t change the amount of Black (K) in a color for a CMYK doc- ument. at component is established by the CMYK Working Space, which is chosen in Edit > Color Settings. ➤ To restore the original dialog settings, hold down Alt/Option and click Reset (Cancel becomes Reset). B  e o r i g i n a l p u r p l e e y e s h a d o w i s n o w r e d d i s h b r o w n . A We lowered the Fuzziness value to 65, Shift-clicked more areas on the pot to add them to the selection, then changed the Hue. ptg 272 Chapter 16 Using the Color Replacement tool e Color Replacement tool lets you change color, hue, saturation, and luminosity values, except instead of using a dialog as you do with Replace Color, you apply changes manually with a brush. You can also specify mode, sampling, limits, and tolerance parameters for the tool. And unlike the Brush tool, which applies at colors, the Color Replacement tool tries to preserve the original tex- ture as it changes colors. is tool, like the Replace Color and Match Color commands, is especially useful to advertising and catalog designers. To use the Color Replacement tool: 1. Open an RGB image. 2. Choose the Color Replacement tool (B or Shift-B). 3. To choose a replacement color, do either of the following: Choose a Foreground color from the Color or Swatches panel, or sample a Foreground color by Alt/Option clicking in the document. If you’re going to choose Background Swatch as the Sampling option in step 5, choose a Background color now. 4. If the color you chose isn’t on the Swatches panel, add it to the panel by clicking the New Swatch of Foreground Color button. 5. From the Options bar, choose parameters for the tool: A From the Brush Preset picker, choose a high Hardness value and a low Spacing value. To control which color characteristics the tool applies to the image, choose a Mode of Hue, Saturation, Color, or Luminosity. We’ve been pleased with the results we’ve gotten with Color mode. Click a Sampling button: Continuous to apply the current Foreground color to all pixels the brush passes over (we prefer this option because it lets us replace both light and dark colors); or Once to sample the rst pixel the brush crosshairs click on and apply the Foreground color only to pixels that match that initial sampled color (since this option connes the sampling to just one color, if you need to replace, say, dierent shades of a particular color, you would have to sample each one sepa- rately); or Background Swatch to replace only colors that match or are similar to the current Background color. From the Limits menu, choose Discontiguous to recolor only pixels under the pointer; or Contiguous to recolor pixels under the pointer plus adjacent pixels; or Find Edges (our favor- ite option) to recolor pixels under the pointer while keeping the color replacement within dis- crete shapes. Note: Remember that in addition to the Limits choice, the tool is also controlled by the current Sampling and Tolerance choices. Choose a Tolerance value (1–100%) for the range of colors to be recolored. A high Tolerance value permits a wide range of colors to be recolored; a low value allows only pixels that closely match the sampled color to be recolored. Optional: Check Anti-alias for smoother transi- tions between the original and replacement colors. If you’re using a stylus and tablet, click the Tablet Pressure Controls Size button and from the Size menu on the Brush Preset picker, choose Pen Pressure or Stylus Wheel. ★ 6. Click a layer, adjust the brush diameter by pressing [ or ], then drag across the areas to be recolored ( A–D , next page). Only pixels that fall within the chosen Mode, Sampling, Limits, and Tolerance parameters will be recolored. ➤ For precise control when using the Color Replacement tool, you can change Options bar settings or brush diameter between strokes. A Choose settings for the Color Replacement tool from the Options bar. ptg Retouching 273 A We want to change the light green stripes on the woman’s sweater to aqua blue. B With the Color Replacement tool and the tool settings shown in the gure on the preceding page, we’re painting aqua blue (our current Foreground color) over the light green on the woman’s sweater. C Next, we zoomed in to recolor smaller areas. At a Tolerance of 40%, we were able to replace the color of both the highlight and shadow areas within a stripe. When replacing the colors along the edges of the stripe, we used a lower Tolerance of 15%. D We unintentionally recolored some dark stripes, which was possible even when Find Edges was the Limits set- ting for the tool. To repair the error, we Alt/Option click to sample the original color in the darker stripe (as shown above), then will apply strokes with that sampled color. . choose the name of the source document that you opened in step 1. e target document will instantly adopt color values from the source document. Note: If the source document contains multiple. the desired color values. REMOVING A COLOR CAST IN THE SAME DOCUMENT ➤ To correct the color in a docu- ment without using another docu- ment as source data, choose None as the Source image. Color command to match the color saturation and brightness of one layer or docu- ment to those of another layer or document, and to remove color casts. is would be useful, say, for unifying