I have been given a request to re-size and up the resolution on a handful of images to be printed 40 in. x 30 in. to be hung on the walls in a new facility conference room where clients will see them. A lot of the images I've been given are pretty lo-res (10 in x 8 in, 96 dpi), so obviously when I try to re-size them to 40 in x 30 in, the quality decreases significantly.
So my question really is, do you think I need to get a photographer to go out and shoot new images (these are the only images they have on file), or do you think just upping the resolution in Photoshop on the images I've been given will do the trick?
If we need to re-shoot, what file size/format should as ask to receive from the photographer? And if I can just re-size what resolution do you think it should be in order fpr the images to look clear for viewing?