SUMMARY Kdenlive has a Wipe transition as well as Luma and Dissolve, which appear to be so closely related that the docs have the latter point to the former <https://docs.kdenlive.org/fr/compositing/transitions/wipe.html>, with a note mentioning additional parameters Use transparency and Make padding transparent. However, there is no explanation as to what these parameters do. I have not the faintest idea what these mean, but in my projects, having these settings checked (which is the default) causes a flash during the transition, as if the transitioning track were briefly transparent and showing the track below (or plain black). STEPS TO REPRODUCE 1. Put two clips next to each other on a track. 2. Select the left clip. 3. Press U on the keyboard. OBSERVED RESULT A transition is added between the two clips, of king Luma, with None (Dissolve) mode and both Use transparency and Make padding transparent. Rendering shows a brief black flash during the transition. EXPECTED RESULT Default transition settings should not add rendering artifacts (or at least it should be clearly explained in the doc and the tooltips in the transition GUI). SOFTWARE/OS VERSIONS Operating System: Kubuntu 24.04 KDE Plasma Version: 5.27.11 KDE Frameworks Version: 5.115.0 Qt Version: 5.15.13 Kernel Version: 6.8.0-49-generic (64-bit) Graphics Platform: offscreen Processors: 8 × Intel® Xeon® CPU E3-1245 v5 @ 3.50GHz Memory: 31.2 Gio of RAM Graphics Processor: NVIDIA GeForce GTX 1650/PCIe/SSE2 ADDITIONAL INFORMATION It is also not clear why there are Wipe and Luma and Dissolve if, says the doc in <https://docs.kdenlive.org/fr/compositing/transitions/transitions_list.html>, "Dissolve works exactly like Wipe but has additional parameters." and "Luma works exactly like Wipe but has additional parameters."