GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: New User

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Hi all,

So I have been looking and looking but to know luck.

I have a bunch (a lot) of pictures (portrait photos) that I need to resize. normally this is not really an issue but the device I am going to display them on is fixed at a 16:9 aspect ration. Currently tried windows power tools which can resize to fit inside the 1920x1080 envelop but I loose the aspect. is there a way to bulk add a mat to a picture if I made the mat 1920x1080 and have gimp add the picture I want to a different layer.

GIMP version 2.8.14...? That's an almost 10 years old GIMP you have, nowadays version is 2.10.36...

Anyway, if I understood, you want to put all your image as layers to resize them all at once.
But did you think how you will export each layer as image? one by one?

To add a bunch of pictures as layers, it's very simple, from your window explorer select all the images you want to open as layers then drag and drop them all at once INSIDE the canvas or INSIDE the layers' dialog (an image should already be there)
Then to combine the background (mat) with each layer, use that script > https://chiselapp.com/user/saulgoode/re ... combine-bg

But before to import and resize, you want a plugin to export all layers as separate image

Export all layers > https://kamilburda.github.io/gimp-export-layers/ this is my favorite as it has plenty other functions.
Ofnuts has a more direct one (simplicity is always good) called ofn-export-layers > https://sourceforge.net/projects/gimp-t ... s/scripts/

Once installed, restart GIMP Import images, resize them, use whichever you did install (ofn-export-layers comes with a manual inside the zip)

Another solution is to install BIMP for GIMP like that it will batch process directly in a selected directory/folder > https://www.alessandrofrancesconi.it/projects/bimp/

EDIT: Wallace was faster