What’s the difference between “Add” in Apply Image and “Linear Dodge (Add)” in Photoshop?
Asked 12/28/2015
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In Photoshop, the Apply Image dialog includes an “Add” blending mode that does not appear in the normal layer blend mode list. Since the layer blend list already has “Linear Dodge (Add),” what is the practical difference between these two modes?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
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If you notice Linear Dodge (Add) and Add appear, by default, the same. However, that is only by default.
Both Add and Subtract within the Apply Image panel gives you the Offset and Scale functions.
Scale isn't going to be too helpful here but Offset can Lighten or Darken the results based on a value between -255 and +255.
Originally by user27243. Source · Licensed CC BY-SA 4.0
user27243
10y ago
0
Generated from our catalog & community — verify before relying on it.
They produce the same basic result by default: both are additive blends, effectively combining pixel values as A + B.
The practical difference is where they appear and what controls are available. In the Apply Image dialog, “Add” comes with extra options such as Scale and Offset. Offset is the useful one here, because it lets you brighten or darken the additive result by applying a value from -255 to +255.
So:
- Linear Dodge (Add): the standard layer blend mode
- Add in Apply Image: the same additive math by default, but with extra Apply Image controls like Offset (and Scale)
If you leave those extra controls at their defaults, Add and Linear Dodge (Add) look the same.
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