Does VAE work the majority of the time?

[tearxinnuan]

I don't know much about the working principle of VAE, I always think of it as an image filter.
But I found that even if VAE is enabled, it is not always useful. In most cases, the pictures generated by whether VAE is enabled or not have no change, but only a few have changed.

I use several models of NAI, and VAE is also provided by NAI. After my own test, their final-pruned model and latest model, VAE does not change the image. Only the prevgood model, after using VAE, the image will be softer than before using VAE.

I don't know if it is a bug of webUI? If you open the WebUI in the form of loading VAE at the beginning, and then switch SD VAE to none in the settings, it seems that the effect of VAE will not be removed.

Perhaps it is for this reason. I found that once VAE is enabled, even if VAE is set to none in Setting, VAE cannot be removed correctly. It still exists and affects the image.

[arpitest]

VAE is always in use, it converts latent vectors to pixels! All models include a VAE, but you can override it selecting a custom VAE file. there are finetuned VAE files which work better for human face or other subjects than SD's own "universal" VAE.
if you set it to None, then model's own VAE will be used...

[tearxinnuan]

I probably get it, so I compare custom VAEs to photo filters XD.
But now there is a problem. It seems that the VAE hot switch in the WebUI seems to have a bug. There is no problem with switching between two different VAEs. However, once the custom VAE is loaded, and then the VAE option is set to "NONE", it will be invalid. (It is still the effect of loading the custom VAE), only by keeping the "NONE" option and restarting the WebUI will the custom VAE be really removed.