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Toxic Green Smoke Stack
In this tutorial, we'll look at some tools and techniques in order to change standard white smoke into a toxic looking green smoke. Many of the techniques you will learn in this tutorial can be applied to numerous other projects.
Step-by-Step Instructions:
1. Open in Photoshop a photograph of standard smoke stack that is emitting white smoke.

2. As you can see from the photo above, there are various elements of color to consider. Of course, what we will be focusing on most in this tutorial is the smoke that is emmitting from the smoke stack. To do this, we need to select the smoke via "Quick Mask Mode".
3. To change the color of the smoke, we must use "Quick Mask Mode". So first select the color "black" from the swatches pallette. Then click the Quick Mask Mode toggle button.

4. Select the paint brush tool and begin coloring in the smoke. Please note: When you are painting in Quick Mask Mode, the result will be a transparent red color. You are not actually painting in red, this transparent red color is just to inform you of which areas that you are coloring in Quick Mask Mode.

5. As you can see above in the illustration, I am filling in the smoke area with Quick Mask red. However, it's important to get the edges as well and this involves using a smaller brush size, as well as applying the smudge tool for the hazey edges of the smoke. When it's done, you should have all of the smoke colored in the transparent red of the Quick Mask.

6. When you are finished coloring in the Quick Mask, then click the "Edit In Standard Mode" button to exit "Quick Mask Mode".

7. This will turn the transparent red into a selection. However, the selection is of the blue sky and not the actual smoke itself. In order to fix this so that the smoke is selected instead, you will need to goto Select > Inverse from the main menu.
8. Now the smoke is selected and you can apply your color changes to the selected areas of the smoke.

9. Since our objective is to turn the smoke into a toxic green color, then goto Images > Adjustments > Color Balance.
10. When the Color Balance box appears, experiment with the color sliders to get the green color you are looking for to apply to the smoke.
11. Once you are satisfied with the green color, click OK and you now have a smoke stack with toxic green smoke coming out.

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