Transparency turns black after Math:Multiply node. Need help I'm working on Blender VFX and I'm using a blur node. This weakens the colors and I am trying to use a Math:Multiply node to strengthen the colors. However, when I use this node, it turns the transparent background to black. Is there a node that strengthens colors but does not change the background, or a node that changes transparency based on how dark the image is.

EDIT::
Unfortunately, palkomino's answer doesn't really help. The RGB Curves node does nothing!





I need a result like the Math:Multiply node, but with a transparent background.
The problem is that the math node uses a value (=> grey dot) and not a color (=> yellow dot). You'd rather use a RGB Curves node (ShiftA => Color => RGB Curves) and change it's C value. This will give you what you want.

 
Look at how the backdrop changes. The first time it's the normal render without any compositing. It still has an alpha channel. The second time it's with the math note. The alpha channel disappears. The third time it's with the RGB Curves node. The colors get strengthen but the alpha channel stays.