user18345: I am editing some video in Kdenlive and I want to make a subsection of my video black & white.
I know that I can make the whole clip black and white by adding a "saturation" effects. But could I (for example) choose a square within the clip and make only that part black and white?

user-1: Yes, it is possible but with different tools and another workflow.
[ Your video] + [ Cropped black & white video part ]  ---TRANSCODING-----> New_video ready for Kdenlive.
To do that, you need to transcode with a tool such as FFmpeg and look for "overlay" and "ffmpeg" keywords.

18345: <p>I am editing some video in Kdenlive and I want to make a subsection of my video black &amp; white.</p>
<p>I know that I can make the whole clip black and white by adding a &quot;saturation&quot; effects. But could I (for example) choose a square within the clip and make only that part black and white?</p>
 -1: <p>Yes, it is possible but with different tools and another workflow.</p>
<p>[ Your video] + [ Cropped black &amp; white video part ]  ---TRANSCODING-----&gt; New_video ready for Kdenlive.</p>
<p>To do that, you need to transcode with a tool such as FFmpeg and look for &quot;overlay&quot; and &quot;ffmpeg&quot; keywords.</p>
