Lightroom automaticaly enlarges print size. How do you stop this?

Question

How do you keep Lightroom from changing the print size? For example, if I have a 4.5 x 7.5 image ( the image size displayed in PS), LR seems to want to make it larger than this size, such that it fits into an arbitrary cell size designated by the "Fine Art Mat" template. I select this template because the other single cell templates want to enlarge it even more.
How do you tell Lightroom to leave the image size alone? Right now I have to open the image in PS, check the exact size dimensions, then switch back to LR and specify these dimensions in the cell size, which rounds the numbers off to two decimal places. This is time consuming and awkward. Why isn't the default to print the image its actual size instead changing to fit an arbitrary cell size in a template? Lightroom is suppose to make things simpler, but in this case it makes it more complicated.
Also, if you want a specific size image and ppi, is there some way to specify the size like you can do in PS?

Answer 1

Alexander,
What I mean is print size. I agree that it is possible to specify a cell size, which is how print size is specified in LR. The problem is that LR doesn't know what size the image is suppose to be printed at. This is not my fault, but a fault in the design of LR.
The actual print size of a digital image is determine by its number of pixels and the specified resolution. These parameters are encoded in each image file. LR fails to recognize this information, ignores the information and automatically changes these parameters to fit into an arbitrary cell dimension/resolution.
This is LR fault and not the photographer. It creates a very real issue to not only photographers who scan artwork but also for photographers who have regularly made prints in the past of their own work or artwork they reproduce for others. For example I and many photographers make prints of our work, exhibit this work and sell it. Our image files have encoded in them the pixel dimension/resolution, thus the print size on paper. When a print is ordered, then we want to be able to print it out quickly at this encoded print size. This should be a zero step process, as far as image print sizing goes, since we have already previously encoded the print size.
Print sizing in LR is not a zero step process for previously encoded files, it involves the steps outlined in my original posts. This is an issue to many photographers who sell prints of their work or reproduce artwork of other artists. Granted it only takes a minute or two completing the steps I have outlined, but this is a nuisance, considering that it could be very simply avoided by the suggestions outlined by myself and other posters to this thread.