Applications of filters: linear editing software such as Photoshop, nonlinear editing software such as Edius, and mobile phone APP.

So the use of filters is not necessarily realized through Photoshop.

Can't say that the filter is PS.

Now the definition of PS is relatively broad, generally referring to the operation process of the changed screen.

In other words, all the original images can be regarded as PS images after processing.

Here we should consider some special effects (filters) used when taking pictures with mobile phones or portable cameras.

If used, it can also be considered as PS processing.

Then the definition of the original image is a photo that shows the natural color and saturation to the maximum extent.

Generally, the pictures taken by SLR cameras are the main ones.