Text on a cup (Photoshop Tutorial)
Source:
http://www.e-miestas.com/
Tutorial

1. Open picture (Ctrl + O)
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2. Choose Horizontal Type Mask Tool (T)
3. Write a word
4. Layer > Rasterize > Type
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To make straight bend text needs to be in middle. To make that we will use Align Layers To Selection
5. Select > All (Ctrl + A)
6. Layer > Align Layers To Selection > Vertical Centers
7. Layer > Align Layers To Selection > Horizontal Centers
8. Image > Rotate Canvas > 90 CW
9. Filter > Distort > Shear
10. Make these settings:
11. Image > Rotate Canvas > 90 CCW
12. Choose Move Tool (V)
13. Put text onto cup
14. Set opacity to 70%
15. Done
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Result