Hi there.

There is an issue with the Blend Modes in Blender’s VSE between Channels.

The issue appears when attempting to blend opacity transition between Channels. In short I have a clip or an image on Channel 1 and place another clip/image on Channel 2 and want to blend them together. I am using Cross blending mode for the Channel 1 as a base and choose, for example, Exclusion for Channel 2 and fade the Exclusion out by keyframing the Opacity of the Exclusion Channel. The transition does not work for the Exclusion, as is also the case in many other blending modes. In previous versions of Blender the Alpha Over did not work but has been fixed now, but there are several other blend modes that do not respond to the opacity transition. I come from Premiere and these transitions work there so I am sure this is a bug that can be fixed or perhaps it is just how Blender handles the blend modes and that might be changed. I love Blender and have been using it for a long as a 3D app, but want to see if I can use Blender as my main VSE as well and am therefore making this report to see if it could help make Blender even better - keep up the good work :-)

I have gone through all the blend modes and listed them below to show which work and which are not working.

The setup is as follows:

MacBook Pro, Intel, Mojave 10.14.6
Blender 3.1.0 Alpha
Images PNG with Alpha
Channel 1 - Blend Mode Cross Opacity = 1
Channel 2 - Testing blend modes, keyframing Opacity from 1 - 0.

First Category:
Vivid Light - Not Working
Hard Light - Not Working
Soft Light - Not Working
Overlay - Not Working

Second Category:
Add - Working
Color Dodge - Not Working
Screen - Not Working
Lighten - Not Working

Third Category:
Linear Burn - Not Working
Color Burn - Not Working
Multiply - Working
Darken - Not Working

Fourth Category:
Cross - Working
Replace - Working

Fifth Category:
Over Drop - Working
Frame Cross - Working
Alpha Over - Working
Alpha Under - ?

Sixth Category:
Value - Not Working
Color - Not Working
Saturation - Not Working
Hue - Not Working

Seventh Category:
Subtract - Working
Exclusion - Not Working
Difference - Not Working

Eight Category:
Pin Light - Not Working
Linear Light - Not Working

Please check with latest alpha build from https://builder.blender.org/download/daily/

This issue was resolved 2021-12-29, your build is from 2021-12-27