0001725: The compositing of Vignette effect doesn't work as expected

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Date Submitted

Last Update

0001725

Kdenlive

Transitions

public

2010-08-02 21:27

2013-01-28 19:51

Reporter

ghomem

Assigned To

ptitmain

Priority

normal

Severity

minor

Reproducibility

always

Status

closed

Resolution

fixed

Platform

64 bit

Mandriva Linux

OS Version

2009

Product Version

0.7.7.1

Target Version

Fixed in Version

0.9.4

Summary

0001725: The compositing of Vignette effect doesn't work as expected

Description

I'm trying to apply an effect to a certain region of the video. I was able to to that on a rectangular region by applying the scale0tilt effect on a clip, applying another effect (eg, brightness) and compositing it with the same clip without any effect.

This works but the effect gets applied "sharply" to a rectangular region which is not ideal. Better than this would be using the Vignette effect where we can select circular regions and smoothen the perimeter.

However using the Vignette effect the behavior seems different: the video on the top track doesn't get composited. Instead covers the video on the next track.

Please see the screenshots.

Steps To Reproduce

1. Add a clip to two tracks simultaneously
2. Apply the Vignette efect to the top clip
3. Apply another affect to the top clip (eg: add brightness)
4. Add a Composite transition to the top clip

Additional Information

Screenshots are atacched.

Tags

No tags attached.

Build/Install Method

3rd party package

Attached Files

scale-tilt.png [^] (426,451 bytes) 2010-08-02 21:27

vignette.png [^] (270,054 bytes) 2010-08-02 21:27

Relationships

Notes
(0005489) ttill (developer) 2010-08-08 21:55 edited on: 2010-08-08 21:55	Yes the vignette effect just adds a black area without any transparency. If you only want to move and scale the clip on top without cropping you can use "c0rners" (only available with a very recent version of frei0r, for pretty defaults values additionally you need kdenlive from svn) and set the smothness there. Just yesterday a new filter was added to frei0r (called alphaspot) which can draw shapes (rectangle, ellipse, triangle, diamond) in the alpha channel. Using the rectangle shape is like cropping expect you can set the smoothness. Hope this helps or at least makes some hope for the future (if you don't want to get into compiling the stuff). If I used terms you do not know just let me know so I can explain.

(0005495) ghomem (reporter) 2010-08-09 02:11	Hello Till, thanks for the answer. Will it be possible to apply an effect to only a certain part of the video using this new effect you created plus Composite? Or in some other way?

(0005550) ttill (developer) 2010-08-11 15:03	I did not write the effects. They were written by Marko Cebokli (in the Kdenlive forum as Marko). Yes you can use alphaspot the same way you described in your original post.

(0008781) ptitmain (developer) 2012-12-14 22:51	Hi I think that the advices given by ttill solves this issue. Thank you for the discussion !

Issue History
Date Modified	Username	Field	Change
2010-08-02 21:27	ghomem	New Issue
2010-08-02 21:27	ghomem	File Added: scale-tilt.png
2010-08-02 21:27	ghomem	File Added: vignette.png
2010-08-08 21:55	ttill	Note Added: 0005489
2010-08-08 21:55	ttill	Note Edited: 0005489	View Revisions
2010-08-09 02:11	ghomem	Note Added: 0005495
2010-08-11 15:03	ttill	Note Added: 0005550
2012-12-14 22:51	ptitmain	Note Added: 0008781
2012-12-14 22:51	ptitmain	Status	new => resolved
2012-12-14 22:51	ptitmain	Resolution	open => fixed
2012-12-14 22:51	ptitmain	Assigned To	=> ptitmain
2013-01-28 19:49	j-b-m	Fixed in Version	=> 0.9.4
2013-01-28 19:51	j-b-m	Status	resolved => closed