Replace color in image areas by Photoshop (Lesson 5)

  The Color Replacement tool simplifies replacing specific colors in an image. You can paint over a targeted color with a corrective color. The Color Replacement tool doesn’t work in images in Bitmap, Indexed, or Multichannel color modes.

How to use the tool 

1- Select the Color Replacement tool [under the Brush Tool] .
2- Choose a brush tip size in the options bar ,keep the blending mode set to Color
3- For the Sampling option, choose one of the following

• Continuous ,Samples colors continuously as you drag.
• Once ,Replaces the targeted color only in areas containing the color that you first click.
• Background Swatch  ,Replaces only areas containing the current background color.

4- For the Limits option, select one of the following:

• Discontiguous  ,Replaces the sampled color wherever it occurs under the pointer.
• Contiguous  , Replaces colors that are contiguous with the color immediately under the pointer.
• Find Edges  , Replaces connected areas containing the sampled color while better preserving the sharpness of shape edges.

5- For tolerance, enter a percentage value or drag the slider. Choose a low percentage to replace colors very similar to the pixel you click, or raise the percentage to replace a broader range of colors. 
6- To define a smooth edge in the corrected areas, select Anti-aliased.
7- Choose a foreground color to replace the unwanted color.
8- Click the color you want to replace in the image.
9- Drag in the image to replace the targeted color.
  

Blending modes

• Normal : the default mode.Edits or paints each pixel to make it the result color.
• Dissolve: the result color is a random replacement of the pixels with the base color or the blend color, depending on the opacity at any pixel location.
• Behind : Edits or paints only on the transparent part of a layer .
• Clear : Edits or paints each pixel and makes it transparent.
• Darken : make the color darker.
• Multiply: Multiplying any color with black produces black.
• Color Burn : increasing the contrast,with white no change .
• Linear Burn : decreasing the brightness.  with white no change.
• Lighten : Pixels darker than the blend color are replaced, and pixels lighter than the blend color do not change .
• Screen : The result color is always a lighter color, with black leaves the color unchanged.
• Color Dodge : decreasing contrast , with black produces no change.
• Linear Dodge (Add) : increasing the brightness, with black produces no change.
• Overlay : Multiplies or screens the colors, depending on the base color.The base color is not replaced, but mixed with the blend color to reflect the lightness or darkness of the original color.
• Soft Light : Darkens or lightens the colors.
• Hard Light : The effect is similar to shining a strong spotlight on the image.This is useful for adding highlights to an image.
• Vivid Light: Burns or dodges the colors by increasing or decreasing the contrast.
• Linear Light : Burns or dodges the colors by decreasing or increasing the brightness.
• Pin Light : Replaces the colors. This is useful for adding special effects to an image.
• Hard Mix : Adds the red, green and blue channel values of the blend color to the RGB values of the base color.
• Difference : subtracts either the blend color from the base color or the base color from the blend color, depending on which has the greater brightness value.
• Exclusion : Creates an effect similar to but lower in contrast than the Difference mode. Blending with white inverts the base color values. Blending with black produces no change.
• Hue : Creates a result color with the luminance and saturation of the base color and the hue of the blend color.
• Saturation.
• Color.
• Luminosity : Creates a result color with the hue and saturation of the base color and the luminance of the blend color. This mode creates the inverse effect of Color mode.
• Lighter Color .
• Darker Color .