Soft glow effect Photoshop
To brighten using levels, move the right most triangle (under the graph) to the left.
To change contrast move the middle triangle (move left=less contrast).
The key to the bloom effect lays in the blending mode of the layer.
You can use Screen, Overlay, Soft Light or Hard Light.
Glow effect in photo Just add your photo in tool, set amount of Glow ranging from 0 to 100 and blur effect if needed, then click Glow button to apply Glow effect in selected photo.
Glow effect combines blur with brightness to simulate filmy image.