How to add sky image to you picture in Photoshop.

After a bit of research on the internet, this is how I do it. I am not a Photoshop expert. this is just a summarised note for me just in case I want to do it again. However, you must have some basic knowledge of Photoshop.

1. Open the main Picture.
2. Magic wand the sky.
3. Inverse select.
4. Expand the border a bit - Select-Modify-Expand (1 or 2 pixel)
5. Make a new layer via copy - Ctrl-J.

6. Open your sky image from your PC. Ask Mr. Google if you don't have one.
7. Select and copy sky - ctrl-A and C.
8. Free transform the sky image suit your main picture. - ctrl-T (edit-transform).
9. Make sure the blend mode is set to normal.
10. Select copy of BG layer.
11. Blur edge a little bit.
12. Make top 1/2 of the sky darker - select with the lasso tool, feather to 150, then add curve to darken a bit.
13. That's it.

After and Before pictures

How to create a parallax effect in Adobe After Effect.

 Photoshop

1. Select the image.
2. Duplicate layer.
3. Select background copy.
4. Quick selection tool.
5. Increase brush size.
6. Create a mask around the object.
7. Click edit - select cut
8. Hide the original background layer.
9. Click edit - select paste.
10 Fit the layer into the mask.
11. New layer showed-up automatically. (Object layer)
12. Hide new(Object) layer.
13. Select BG copy.
14. Select the magic wand tool.
15. Select the white area in BG.
16. Click selection tool.
17. Click edit - fill - content aware.
18. Click select menu - deselect.
19. Click healing brush - spot healing tool.
20. Brush over the border of the object to blend with the rest of the image.
21. Make all layer visible.
22. Save in PSD format.

 After Effect 

1. Import PSD image.
2. Import kind: composition. layer option: merge style into the footage.
3. Double click the composition to open it.
4. Rename the layer accordingly: BG, BG copy, Object.
5. Turn off the BG layer.
6. Select BG copy layer.
7. Click s(scale)- create keyframe(stopwatch). e.g on the timeline: beginning at 100%, end at 115%. 8. Repeat step 7 on the object layer. 100 to 110%.
9. Keyframe position of the BG copy and object layer to achieve more effect. e.g BG copy to the left and Objet to the right. subtle movement is enough.
10. Add to render Q.

 Other technique. 

1. Use camera effect.
2. add 3D to all layer.
3. Pre-comp BG and Object layer.
4. Scale down a little.
5. Add the camera layer. 35mm. No DOF.
6. Keyframe the camera in Z-space forward/backwards.
7. Keyframe the position of precomp

 Optic Compensation FX. 

1. Click effect - distort -Optic compensation.
2. Apply to precomp layer.
3. Set keyframe to 50 at the beginning.
4. Select reverse lens distortion.
5. Set the view center on the object.
6. Set keyframe to 125 at the end of the timeline.
7. Create Vignette to hide over stretched effect.
8. Add solid layer - click adjustment layer - click effect - stylize - CC vignette. 9. Adjust vignette accordingly.

 Thanks to EZ Tutorials and Motion Science.