Sử dụng photoshop cs5 part 35

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Sử dụng photoshop cs5 part 35

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Chuyển đổi các lớp để thông qua một màu xám đen trắng chỉnh Tiếp theo, chúng tôi sẽ chỉ cho bạn một số cách để dải màu sắc từ lớp một mà không thay đổi chế độ màu văn bản. cách ưa thích của chúng tôi (được mô tả ở đây), là sử dụng một đen trắng layer điều chỉnh bởi vì nó cho phép chúng tôi để kiểm soát các cá nhân R, G, B và C, M, kênh màu Y được chuyển đổi thành các giá trị màu xám....

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Nội dung Text: Sử dụng photoshop cs5 part 35

  1. 212 Chapter 13 Converting layers to grayscale via a Black & White adjustment Next, we’ll show you several ways to strip color Click the Targeted Adjustment tool on the from a layer without changing the document color panel, then drag horizontally over an area in mode. Our favorite way (described here), is to use a the image to lighten or darken it. The slider Black & White adjustment layer because it enables corresponding to the predominant color in that us to control how the individual R, G, B and C, M, Y area will shift accordingly. color channels are converted to grayscale values. 4. To further adjust the grayscale conversion, To convert a layer to grayscale via a move the sliders, starting with Reds, Yellows, Black & White adjustment: Cyans, or Blues. For example, you could try using the Yellows slider to lighten or darken a 1. In an RGB image, click a layer or the portrait or to correct a landscape image that Background.A contains a lot of green (B–C, next page). 2. On the Adjustments panel, click the Black & 5. Optional: To apply a tint to the whole image, White button. The Black & White controls check Tint, click the color swatch, choose a appear on the panel. color from the Color Picker, then click OK. 3. Do any of the following: 6. Optional: To restore some original color to the Click Auto to have the program choose the set- whole layer uniformly, lower the opacity of the tings for you (A, next page) or choose a preset adjustment layer. Or to restore color to select from the Preset menu. You can customize the areas, click the adjustment layer mask thumb- settings, as described in the remaining steps. nail, choose black as the Foreground color, then Adjust the sliders to control how each color is with the Brush tool, apply strokes to the image converted to a particular gray level. A lower (for a subtle effect, lower the tool opacity first). value produces a darker gray equivalent for a color; a higher value produces a lighter gray equivalent. A In this image, the color differences between the skin tones and water naturally help us to distinguish between them.
  2. Adjustments in Depth 213 AUTO-SELECTING THE TARGETED ADJUSTMENT TOOL ★ To have the Targeted Adjustment tool become selected automatically on the Adjustments panel when you create a Curves, Hue/Saturation, or Black & White adjustment layer, display the controls for one of those adjustment types, then choose Auto-Select Targeted Adjustment Tool from the panel menu. ORCHESTRATING A SCENE In our environment, as in fine art and photogra- phy, colors help to define spatial and shape rela- tionships and draw our attention to specific parts A To produce this grayscale version of the image, we chose of a scene. When converting an image to gray- the Auto setting for a Black & White adjustment layer. We scale, think about how you want to reinterpret think the contrast between the figure and background needs the composition. To orchestrate visual movement improvement. with lights and darks instead of color, choose gray levels based on which areas you want to draw the viewer’s attention to. For example, say a bright red shape is located in the center of the B To improve the original composition. Using the Black & White contrast, we reduced controls, you could lighten or darken that shape the Cyans and Blues to make it stand out from the surrounding grays. values to darken the water, and increased the Yellows value to lighten the woman’s neck and cheek. C Now that the contrast between the figure and background has been improved, the figure stands out better.
  3. 214 Chapter 13 Applying a Vibrance adjustment Using a Vibrance adjustment layer, you can either strip the color completely from a layer or desaturate a layer partially and then adjust the Vibrance to control the color intensity. To desaturate a layer using a Vibrance adjustment: 1. Click a layer or the Background in an RGB image.A 2. On the Adjustments panel, click the Vibrance button. 3. Do either of the following: A This is the original image. For a simple, full desaturation, reduce the Saturation to its lowest value (to –100). To adjust the color vibrance as you desaturate the layer, reduce the Saturation to between –60 and –80, then to control the color intensity in the now almost grayscale layer, increase or reduce the Vibrance value.B–D The Vibrance option boosts the intensity of the least saturated colors the most. B To desaturate the color partially, we lowered the Saturation value for the Vibrance adjustment layer to –60 and set the Vibrance to –50. C This is the image after we applied the Vibrance D Here the image has the same Saturation value of –60 but adjustment layer settings shown in the preceding figure. a higher Vibrance value of +100.
  4. Adjustments in Depth 215 To desaturate a color layer and restore color selectively using Vibrance: 1. Click a layer or the Background in an RGB image. 2. On the Adjustments panel, click the Vibrance button. 3. Click the mask thumbnail on the adjustment layer. 4. Reduce the Saturation all the way to –100.A 5. Choose the Brush tool, and on the Options bar, choose a Soft Round brush, Normal mode, and an Opacity of 50% or less. Choose black as the Foreground color. A To strip the color from this image, we lowered the 6. Adjust the brush diameter, then apply strokes Saturation value for a Vibrance adjustment layer to –100. where you want to restore the original colors.B–C You can change the brush opac- ity and diameter between strokes. To restore grayscale areas, press X and paint with white. B We applied brush strokes to the adjustment layer mask to restore color to the salad, where we want to draw the viewer’s attention. C Now the color is visible only in the center of the image.
  5. 216 Chapter 13 You can also use the Vibrance controls to adjust the saturation of a full color layer. To guard against over- saturation and clipping, the Vibrance slider boosts the intensity of less saturated colors more than that of highly saturated colors. For this reason, this slider is useful for reviving skin tones. The Saturation slider, on the other hand, applies the same change to all colors regardless of their original saturation levels. To adjust the vibrance of a color layer: 1. Click a layer or the Background in an RGB image.A 2. On the Adjustments panel, click the Vibrance button. 3. Do either of the following: Increase the Vibrance value, then reduce the Saturation value slightly.B Reduce the Vibrance value, then increase the Saturation value slightly.C A The color in this portrait is oversaturated. B For the Vibrance adjustment layer, we set the C For a subtle variation, we set the Saturation value to Saturation value to –25 and the Vibrance value to +40. +25 and the Vibrance value to –40. The colors are also Now the color and the contrast are less intense. less intense here, but the contrast is slightly stronger.
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