Now you know how to create a transition between clips, is time to experiment with another feature in Kdenlive: The effects.
Effects are ways to change your original clip. Kdenlive comes with different effects that can be applied to the audio and others that can be applied to the video. The small number of standard audio effects can be easily increased if you use the Ladspa plug-ins (see this page  to know how to load them).
To know in detail all effects and how they works, you can have a look at this page .
In this guide we'll know how to apply a "Greyscale" effect to a clip. This effect, as the name indicates, will take out colors from the video and display it in black & white (well, really using black, white and different grey tones! ).
Normally, except some of them, the effects apply to a full clip so, if you want to limit the effect to just a part, you need to create "subclips" as explained before in this page.
So let's go to clip in track #2. Select it and click the right mouse button. In the context menu select Add Video Effect -> Greyscale. You'll see immediatly how the colours in your clip dissapear and are replaced by grey tones!
In the same way as transitions, you can also edit the effect parameters. To do so, select the "Effect Stack" tab in the Project Panel. Unfortunately, the Greyscale effect is so easy that has no parameters!
But in this tab, you can also find some useful icons to organize the effects:
You can see also that behind the effect name there's a checkbox. If you uncheck it, the effect will not be applied but still remains in the effect list with the selected parameters (if any!). This is useful if you want to use it later on.
And behind the "Parameters" tab, you'll notice another one titled "Keyframes". For some effects, you can select as many keyframes as you need in the clip and for each keyframe you can define different parameters. This is useful if you want, for example, mute a part of a clip. You can do so in two ways:
- Creating a subclip and applying the "Mute" audio effect to this subclip
- Or using the "Volume" effect. This can be applied to the full clip and, by defining different keyframes you can adjust the volume, for example, to start muted, then increase progressively, then continue at normal level, then decrease progressively and become muted, continue muted for a time and start again progressively ...
To know more about keyframes and how to work with them see this page