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This tutorial demonstrates how to replace colour using the Replace Colour command and the History palette. You can download the image I am working with Here. Unzip the file and open the image onto Photoshop’s workspace.
Undo and Navigation Steps
Two ways of undoing steps are from the top menu, Edit then Step Backwards. Alternatively, click a previous snapshot in the History Palette.
Navigate (zoom in and pan) your image using the Navigator Palette,
or the Zoom Tool. 
Activate The Hand Tool by tapping the Spacebar, keeping the Spacebar pressed, pan your image in the usual way. 
Note
Photographs will always react uniquely, therefore, when using your own images, settings will (slightly) differ.
From the top menu choose Window, and ensure there is a tick before History.
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Open your start image onto Photoshop’s workspace.
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From the top menu, choose Image then Adjustments then choose Replace Colour. In the subsequent Replace Colour dialogue box, ensure the left-side Eyedropper Tool is active, and Fuzziness is set to around 86. Note: Fuzziness will be altered later. Now, left-click Once over the mannequin’s brown dress - as highlighted below-left.
This changes the Colour swatch (in the Replace Colour command box) to the brown you have just clicked.
Now, press your keyboard’s Shift key, and simultaneously left-click (once) over the brown dress. You are looking to change the contrast of the thumb nailed dress in the replace Colour box - this is represented by the dress turning white.
To further increase the contrast, (ensure Shift remains pressed), then left-click a lighter area of the brown dress - and the thumbnail in the Replace Colour command box will display a whiter dress.
 
Don’t worry if other areas are highlighted, (such as the face and branches), this is easily rectified with the History Brush, later.
Now, (with the Shift key pressed), left-click around the image, until the thumbnail of the brown dress, (in the Replace Colour command box), has completely changed to white.
To advance the whitening process, grab the Fuzziness slider, and move it to the right. The mannequin’s dress (and other parts of the image), will lighten. You are looking for a good contrast between the dress and its background, and at this stage, nothing else is important.
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When you are happy the dress’s contrast, from the bottom of the Replace Colour command box, adjust the Hue and Saturation sliders, and find an alternative colour, for the mannequin’s dress.
When you have a colour you like, click OK to apply the settings.
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In the History palette, (if it is not already there) then left-click to apply a History Brush icon onto the original Mannequin.jpg layer - as highlighted below. This sets the source point to the original image, and is crucial if the History Brush is to operate.
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It is time to remove the erroneous purple from outside the dress, therefore, from the toolbar, activate the History Brush Tool.
And set the following (small, hard brush) settings.
Tip
Increase (or decrease) the brush size, by pressing the bracket keys from the keyboard.
Now, paint over the erroneous purple pixels with the History Brush - this paints back the original pixels. 
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Continue painting back the original image, (not forgetting the beads), until you have removed all of the purple, outside of the dress. If you over paint, and remove too much purple - then click a previous snapshot in the History palette, to go backwards.
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When you are happy with the result, link Here to save your work.
Wendi E M Scarth. Top of Page - Home.
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