I'll also throw my hat into the ring on the discussion from 2009 :) My understanding is that Linear Dodge and Add are no different in terms of their basic blend formulas (A+B) it's just the implementation of Opacity that differs.

On Tue, Jan 21, 2014 at 5:08 PM, Darby Edelen <dedelen@gmail.com> wrote:

Instead of Opacity use Fill.  Fill changes the weighting of the layer's pixel values where as Opacity... is dark Photoshop wizardry (I think it performs the blend operation assuming full values from both A and B layers and then alpha blends the AB result with the B layer).

There are only a few blend modes where Fill and Opacity behave differently (due to the maths).  Basically all Dodge and Burn modes, Vivid and Linear light (since they're versions of the Dodges & Burns), Hard Mix (which actually can look pretty nice with a low Fill %) and Difference are the ones I can remember off the top of my head.

If you're relying on a layer mask then things get more interesting.  Copy the layer mask and paste the values into a new layer, clip the mask values to the additive layer, set the top (mask value) layer to multiply and then remove the mask from the additive layer.  Make sure that the additive layer has Blend Clipped Layers as Group enabled.

On Tue, Jan 21, 2014 at 4:14 PM, <pixelbot@comcast.net> wrote:

why don't you comp the element in AE and use that as a layer in Photoshop. Either that or fake it in Photoshop - anyone that holds the logo up to the video screen and says it's different should be laughed out of the room.

tt

---

From: "Nathan Shipley" <nshipley@gmail.com>
To: "After Effects Mail List" <AE-List@media-motion.tv>
Sent: Tuesday, January 21, 2014 3:51:56 PM
Subject: Re: [AE] layer styles break ADD transfer mode

Yes, that's right, I'm replying to a thread from 2009...

I've finally run into a problem where the Linear Dodge (Add) blending mode in Photoshop isn't working the same as the Add mode in After Effects.  Wondering if anyone knows a good workaround as I'm not finding anything useful by Googling the problem.

Details:  I'm prepping a complex comp of a 3D logo we did in After Effects at a higher DPI for delivery to a print house as a PSD.  We're providing a frame from our animation as individual Photoshop layers set up to match the AE comp.

There are some partially transparent light blue particles that are added on top of a light gray background in After Effects that need to be on their own layer.  With Add mode in AE, they make the background a bright blue.  In Photoshop, Linear Dodge (Add) mode makes them look gray and washed out.  I'd like the same behavior between each app.

Here's an example of what the difference looks like with a blue box standing in for the particles:  http://imgur.com/JkcZ8i3

And here's the PSD I used to make those images if you want to try it yourself:  https://dl.dropboxusercontent.com/u/16325397/Add_vs_LinearDodge.psd

I suppose I could make an adjustment layer in PS to recreate the AE add mode within PS, but I'd prefer it to just work the way I expect for clarity when I hand off the file.  Or perhaps there's some way to shift the colors of my transparent blue to make it work the same between both apps in this particular case.

Any thoughts?  Is there something out there I haven't seen or thought about?

- Nathan

On Fri, Sep 18, 2009 at 6:55 AM, Evan Fotis <evan.fotis@gmail.com> wrote:

...in that example Linear Dodge @ 50% is almost indistinguishable with Normal mode.. I'm curious how color dodge would look then.

On 18/9/09 03:12, pixelbot@comcast.netwrote:

found this <http://www.lbox.com/images/ps/linear-dodge-vs-add-example.png>

timt

----- Original Message -----
From: "Chris Meyer" <chris@cybmotion.com>

At 4:53 PM -0700 9/17/09, Phil Spitler wrote:
>This is what John Nack has to say.
>
>http://blogs.adobe.com/jnack/2009/06/you_can_stop_asking.html

I guess he never had to animate it, inside Photoshop (smile).

Quoting from CMG4 page 142:

"The result looks the same as Add mode if the layer it is applied to
is 100% opaque; there are some slight differences as you start to
fade a layer down, with Linear Dodge looking more desaturated or gray
rather than "hot".

(Hmm...just found a type in CMG4...it says Linear Burn when it meant
Linear Dodge...fixed above.)

If anyone has another good example of how Add and Linear Dodge
differ, I'd love to add it to CMG.

  - Chris


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