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The Colour Replacement Tool was originally used to remove red eyes; before the advent of the Red Eye Tool, to work along, you can download the image I am working with Here. Unzip the file and open it 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. 
Tip
Isolate areas you wish to colourise with a marquee - I utilised The Magic Wand Tool to isolate the pineapple. This protects area’s outside of the marquee from being effected by the Colour Replacement Tool.
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Open your choice of image onto Photoshop’s workspace.
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Then from the toolbar, activate the Colour Replacement Tool.
And set the following attributes into the Colour Replacement Options bar.
Note:
When using this tool, (generally speaking); set the Mode to Colour. However, the setting that can make or break an effect is Tolerance, and this setting is dependent on your choice of image. Familiarise yourself with all settings; experiment, and discover how each setting reacts with your image. The settings (above) work well with my image, however, bear in mind, the Brush (size) will be altered as you work.
Quickly adjust the brush size!
To adjust the brush size, press your keyboard’s left-side (or right-side), bracket keys - ensuring the keyboard is set to lower case, and Not capitals!
Navigator Palette
The Navigator palette allows you to zoom into (and pan) your image.
By default, the Navigator tool shares a palette with Info and Histogram. To ensure your navigator palette is displayed; from the top menu, choose Window then click Navigate. Now, throughout this lesson, navigate your image by moving the red rectangle found in the Navigator palette. Additionally, zoom into (and out of) your image by moving the (zoom) slider. Additionally, you can change the red (oblong) viewer to a colour you prefer by clicking open the Palette Options.
And clicking a colour you prefer.
3/ Setting the Foreground Colour
It is time to choose your colour. The colour you will be painting over (replacing), is whatever colour the Foreground Colour is set to. Therefore, set the Foreground to a colour you like by double-clicking the Foreground swatch and choosing a colour from the Colour Picker dialogue, as shown Here.
Alternatively, activate the Eyedropper Tool. 
Then move the Eyedropper to a colour you like, (from an image, for example),
then left-click to collect the colour.
The Foreground Colour is now set to the colour you clicked on. 
Setting The Background Colour Using The Eyedropper Tool
To set the Background colour, (first), press the Alt key of your keyboard, (and keep it pressed). Now, manoeuvre the Eyedropper Tool over your choice of colour, then
left-click. The Background now contains your choice of colour.
Picking up Any Colour
You can collect a colour from any background for example, your Desktop - or a colour from Photoshop’s workspace. To do so, hover the Eyedropper tool over the image you are working on. Then left-click, (or Alt and left-click), and drag the eyedropper to a place you wish to collect colour from. For example, if I wish to set the Foreground colour to the blue of my Photoshop workspace, I would (left-click), then drag my Eyedropper from the active image to the area I wish to collect from. The Foreground immediately changes to my chosen colour.
Tip
To pick a colour from your Desktop, arrange Photoshop over it; ensuring part of the Desktop is in sight, (as demonstrated below). Then left-click to collect a colour in the usual way.
Once you have set the Foreground colour, you are ready to begin.
Retracing your steps
To retrace your steps, from the top menu, choose Edit then choose Step Backwards.
Alternatively, click a (previous) snapshot in the History Palette - or click the original (untouched) image, right at the top of the History palette.
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Now, hover your cursor over the colour you wish to replace, ensuring the circle does not transcend it. Then left-click once.
As you can see (above), the suit’s colour has been replaced with my Foreground colour. Using the circle as a guide, keep left-clicking (then dragging your cursor) over the suit; adjusting the Brushes size, and utilising the Navigator tool as you work.
Tip
You may find it easier to replace the outline first, then fill inside it with colour.
Note
For precision, reduce the Brush size to 1 (pixel) for intricate areas.
Tip
Position the cross hairs directly over stubborn pixels; repeatedly left-clicking, when necessary.
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When you have replaced the suit’s colour, your image will resemble the
following.
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Finish the look by altering the colour of the reflection; to do so, activate the Brush Tool.
And set the following Attributes.
Now, carefully paint the lighter green colour onto the reflected lime suit.
Now you know the basics you can have lots of fun changing images.
Wendi E M Scarth. Top of Page - Home.
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