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This tutorial demonstrates how to remove red eye, using the Red Eye Tool, The Colour Replacement Tool, or the Brush Tool. To work along exactly, you are welcome to download the start image Here. Unzip the file and open the image onto Photoshop’s workspace.
Removing Human/Animal Red Eye with the Red Eye Tool
Removing Human/Animal Red Eye with the Colour Replacement, Brush Tool and Burn Tools
Removing Yellow/Green/Blue Eye from Animals with the Sponge and Burn Tools
General Flash Eye Notes
Redeye (green, yellow or blue eye for animals) occurs when a photograph is taken with a flash. Light from the camera’s flash is reflected onto the retina at the back of the eye, and in humans, (and sometimes dogs) results in red eye, caused by the blood vessels.
Animals; including, dogs and cats, have special reflective layers (tapetum lucidum), over their retinas - similar to mirrors, and this aids their nocturnal vision. This results in the strange green/yellow/blue eyes often displayed in photographs of indoor pets, (taken with flash). As they age, their eyes become cloudy - exacerbating the spooky appearance caused by flash.
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. 
1/ The Red Eye Tool - CS2 & CS3 only
Colour Replacement and Brush Tool CS CS2 CS3 Here!
Open your start image onto Photoshop’s workspace.
2/
Then from the toolbar, activate the Red Eye Tool - this tool was new to CS2.
And set the following attributes into its Options bar.
Red Eye Tool Notes
Pupil Size is dependent on the size of your photograph. Additionally, because the Red Eye Tool is looking to eliminate hues of red, the Darken Amount setting is dependent on the lightness of the red eye, and will be different for each photograph.
3/
Zoom into your image, (top menu View then Zoom in), then hover your cursor over the left-side eye, then left-click, and drag out a rectangle box over the pupil area - as demonstrated below.
 
Then release the mouse button. You will notice that much of the red has been replaced by black.
Reapply the Red Eye Tool until the red has been completely replaced with black.
4/
Repeat Chapters 2 and 3, this time, working with the right-side eye - remembering to adjust the Pupil Size and Darken Amount settings if necessary.
Note
Bear in mind, the density of red eye, (and indeed the pupils’ size), may not be equal, therefore, settings may need to be altered for each eye.
5/
When you are happy with the result, your work is ready to save.
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Removing Red Eye With The Colour Replacement/Brush Tools - CS, CS2 & CS3
1/ Open your start image onto Photoshop’s workspace.
Note
If you prefer, isolate the red pupils with a selection marquee - using the Polygonal Lasso Tool, exactly as described in Chapter 2 of my Removing Yellow, Blue and Green Eye tutorial Here. After surrounding both pupils with a marquee return to this lesson, and continue with Chapter 2. However, given that human pupils are rounder than cat’s - and therefore easier to alter using round brushes; a selection marquee is not always necessary.
2/
Set the default Foreground and Background Black and White colour swatches by tapping your keyboard’s D key. (Pressing the X key swaps their colour).
3/
Now, from the left-side toolbar, activate the Colour Replacement Tool.
Colour Replacement Tool Lesson
And set the following attributes into its Options bar - ensuring Tolerance it set to 100%.
Tip
Quickly adjust the brush size by tapping your keyboard’s bracket keys - ensuring your keyboard is set to lower case.
Alternatively, activate the Brush Tool. 
Remove Colour Using The Brush Tool Tutorial Here!
And set the following (Mode = Colour - Opacity & Flow = 100%) attributes into its Options bar.
Note
The Colour Replacement and Brush Tools are applied in exactly the same way - and both rely on the colour swatches being set to the Default Black and White.
4/
Now, zoom into your image, (top menu View then Zoom in), then hover your cursor over the left-side eye - ensuring the brush size is large enough to encompass just the red
pupil, and taking care not to transcend onto the coloured iris - as illustrated below.
Then left-click (and hold), and drag your cursor over the red area - in a circular motion, until all of the red has been been converted to greyscale. Alternatively, repeatedly
left-click to remove the colour.
After you have removed the red colour from the left-side eye - do exactly the same to the right-side pupil - as illustrated below.
Colour Replacement and Brush Tool Notes
Both the Colour Replacement Tool and Brush Tool are removing colour from your photograph - otherwise know as desaturating - and for this purpose, they work in exactly the same way, when using the settings I have mentioned. With this in mind, be very precise with your Colour Replacement/Brush Tool application; if you transcend outside the pupil area, you will remove the colour, as demonstrated below.
If you do remove colour in error, click a previous snap shot in the History Palette, or Step Backwards - readjust your brush size, and reapply your chosen tool.
5/
To darken the greyscale pupil; from the toolbar, activate the Burn Tool.
Burn and Dodge Tool Tutorial!
And set the following attributes into its Options bar - experimenting with the settings for personal results.
Tip
Quickly adjust the brush size by tapping your keyboard’s bracket keys - ensuring your keyboard is set to lower case.
Now, hover your cursor over the left-side pupil.
And left-click - or left-click and drag the cursor over the (grey) pupil area.
This darkens the pupil, as illustrated above. Note: Each left-click darkens the Burn application, progressively - therefore, repeatedly left-click (or drag the cursor), until you are happy with the amount of darkness.
6/
Now, repeat Chapter 5, this time, darkening (or burning), the right-side eye. When you have completed this, both eyes will be complete - as illustrated below.
Note
Bear in mind, the density of red eye, (and indeed the pupils’ size), are not always equal - therefore, settings may need to be adjusted.
Tip
If necessary, soften the edges between pupil and iris using the Blur Tool - set to a very low Strength. Lesson.
7/
When you are happy with the result, your work is ready to save.
Wendi E M Scarth. Top of Page - Home.
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