Community Expert

Question

Legacy Compositing — What Does it Do?

Forum|Forum|7 years ago
October 20, 2018
6 replies
19655 views

I've just come from the thread below, where the OP had an issue with the brush tool producing broken lines, and he found that Legacy Compositing fixed it. I've also seen a few threads where it has been suggested, and proved to fix issues, but I have no idea what it does and how it works. So if you know the answer,m would you mind sharing, or posting a link?

https://forums.adobe.com/message/10693059?et=notification.mention#10693059

Ta

This topic has been closed for replies.

A

Anonymous

Here's an example of CC 2019's new compositing engine. The left is enabled, while the right is switched back over to legacy mode. The layer is a smart object with a couple of shadows applied to it via a layer style and simply zoomed out to 25%.

Anything under 100% causes these errors, so the new engine has some serious issues as this is a relatively simple task across a wide area of use.

c.pfaffenbichler

Community Expert

Photoshop 20.0.0 or 20.0.1?

Chuck Uebele

Community Expert

Nothing won't work. It just switches to the old code.

Norman Sanders

Legend

FWiW: Legacy Compositing solves some of the problems listed here:

Known issues in Photoshop CC

J

jackh84076713

Participant

I found that smart filter masks were being forgotten and not applied, even though they were present in the layer stack. This meant that my smart objects that contained smart filter masks within them wouldn't update in the main document.

Randomly, I tried Legacy Compositing without having any idea what it did, and it seems to have fixed the issue...

Trevor.Dennis

Author

Community Expert

For what it is worth, I have now unchecked Legacy Compositing, and I am waiting to see if anything stops working. I can't remember what drove me to turn it on in the first place, but I do remember that it fixed whatever that problem was.

C

cynth555

Participant

I just had issues with ps not editing layers. i updated my graphic driver yesterday and suddenly no go on ps. so i talked to tech at adobe and changed to legacy composting. also changed the graphics setting - turned off the gtx nvidia and now it seems that everything is working again.

hope that helps you.

jane-e

Community Expert

Trevor.Dennis

According to this, it has to do with how the color blending mode works (and may be Windows only):

Retouchers beware! Photoshop 2019 breaks color blending mode - DIY Photography

Chuck Uebele

Community Expert

Jane, it's more than blending modes, although there are still some issues with how the blend modes work, and Adobe is working to fix those issues. It is a rewrite of the low level compositing code for layers, suppose to make them work better and faster.

Trevor.Dennis

Author

Community Expert

Thanks guys. I'm just off out, but will check out Jane's link when I get back.

Chuck Uebele

Community Expert

Trevor, they put in a new processing method or something in PS that is suppose to make it quicker and handle newer computers better; however, there are still a lot of bugs with it and if you run across those bugs on your computer, you should use Legacy Compositing instead. This new method is suppose to switch on an off for some features that it can't handle yet, but I'm not sure how well that works.

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