I use Contact Sheet II to compile different sized images onto sheets that we then send out to a printer for heat press apparel printing. I do not want Photoshop to resize the images at all, however. Is there a way to automatically add as many images to a sheet as possible, without changing the dimensions of the original images? Thanks!
Original images are in pixels, so for printing you need to use some relative scale, like inches so depending on that size you actually want your printed image that will change the ppi of your file/document.
As to getting contact sheet to do this, I think it would be easier to write a new script to create what you want or maybe make a template, where you insert the images.