Graphics Programs Reference
In-Depth Information
7. Make sure the strip is selected and press the N key to open the right-hand side
sidebar of the editor, then look for the Edit Strip panel and set the Blend mode
to Alpha Over , also enable the Premultiply opion in the Filter panel.
8. The third strip to be added must be for the sequence of images that were rendered
at /tmp/render/seqs/item2 ; let's not forget to select all the files ( A key, once or
twice) before clicking on Add Image Strip .
9. Once the strip is created in the Video Sequence Editor , let's select it and put it on
channel 2. With the whole strip selected, move it so that the left handle is at frame
228 and the right handle is at frame 427 .
10. This strip must also have the Blend mode set to Alpha Over ( Edit Strip panel at the
sidebar) and the Premultiply opion enabled ( Filter panel).
11. For the fourth strip, we must go to the /tmp/render/seqs/item3 folder (after
clicking on Add → Image ), select all the files ( A key), and then click on the Add
Image Strip buton.
12. With the enire strip selected, let's move it ( G key) to channel 1 and locate it so that
the left handle is at frame 416 and the right handle is at frame 615 .
13. Once again, the "Blend" mode must be set to Alpha Over ( Edit Strip panel on the
sidebar) and the Premultiply opion, located at the Filter panel, must be enabled.
14. To create the fifth (and last) strip, we just need to select the first one, duplicate it
( Strip → Duplicate or press Shift + D ), and move it to the right (staying on channel
2) unil its let handle is located at frame 610 ; then select the right handle and move
it to frame 700 .
Now that we have all the strips created and posiioned at the appropriate places,
it's ime to create the transiions between them. Since the strips for the image
sequences already have the alpha channel modiied to get a customized transiion
from one to another (the Alpha Over blend mode and Premultiply opions were
set for the precise purpose of using the customized transiion), we only need to add
transiions from the irst strip to the second and from the fourth to the ith.
15. The irst transiion must be created by selecing the irst strip ( intro.tga ), then
the second one (noice the order), and going to Add → Effect Strip... → Cross .
This will add a small strip that starts where the second strip begins and ends where
the irst strip ends. This strip is posiioned automaically on an upper channel, so
that it is the one seen in the final render.
16. Transiioning from the fourth to the ith channel is just a mater of selecing the
strip for the image sequence of the item3 scene, then selecing the last strip
( intro.tga ), and adding a Cross effect strip ( Add → Effect Strip... → Cross ).
Once again, the start and end of the strip are dependent on the strips being used as
inputs for the efect and the efect strip is posiioned in an higher channel than the
two strips being composed.
 
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