I am working with model images that our standard images have to be the item with white background. Ive had vendors sending me images with their item only with off white background and I have to do 600 images a day and it gets annoying. Is there a way to automate a white background without taking out the main image and do it all at once to save me time?
It really depends on the consistency of the photos and maybe more importantly, the colour of the subject. PS has the ability to do selections on colour range, so you record your actions on processing a single image to create a PS Action that you can then apply to other images.
If this works, then you can apply the action in a batch process against all your images and let it run.
If your images don't allow for the easy color range selection though, you won't be able to automate it like this. Manually doing the selection will be very time consuming.