This is a great effect. It always reminds me of the scene from the movie “24 Hour Photo” when Robin Williams is standing in the aisle at the supermarket with his eyes closed. When he opens them, they are filled with blood. Very freaky!
1. Open a photo that has eyes in it in Photoshop.
2. Click the “Edit in Quick Mask Mode” button (or press Q).
3. Choose black from the swatches palette and select the Paint Brush Tool. Begin coloring in the eyes (when in Quick Mask Mode, your paint brush will paint a transparent red to indicate the masked area).
4. When the eyes are completely colored in, select “Edit in Standard Mode” button to exit Quick Mask mode.
5. Goto Select > Inverse to inverse the selection so that only the eyes are selected.
6. Goto Image > Adjustments > Color Balance.
7. Adjust the Red sliders under the Shadows and Midtones sections to add red to the selected eyes of the photo.
8. You should now have the entire eyes, including the cornea, filled with red.
9. Create a new layer and name it “Blood”.
10. Choose red from the swatches palette and select the Paint Brush tool. Set the opacity of the brush to 20%.
11. Begin coloring over the entire surface of the eye. Be sure not to lift up your brush as you paint over each eye so that it has an even opacity.
12. Create a new layer and name it “Drip”.
13. Choose a dark red color from the swatches palette and select the Paint Brush tool. Be sure that the opacity is set back to 100%. Then color in the drips of the blood at the bottom edge of the eyes.
14. Now choose a lighter shade of the same red and color the highlights on the drips.
15. Goto the Drip Layer, right click it and select “Blending Options”.
16. Select the Drop Shadow checkbox and set to the following values or until the shadow behind the blood drip looks convincing.
17. You are now done! You should have blood soaked eyes with a light shadow behind the drips for emphasis.