Hello i'm new in kdenlive,
try to create sideshow clip but i cant found luma effect option
Kdenlive Version : 18.12.2
OS : Manjaro
https://cdn1.imggmi.com/uploads/2019/2/28/357ea216513b6e784759448f6e9dd643-full.png

You clicked correct dissolve to choose a luma wipe transition. It seems the luma.pgm files were not installed.

Check in /usr/share/mlt/modules/lumas/PAL and .../NTSC for luma01.pgm up to luma22.pgm.

If this files are missing please try with the current Kdenlive AppImage version 18.12.1b
https://files.kde.org/kdenlive/release/