I've never submitted a question before so I hope this is the right way of doing this. I have been trying to print out some files that I have made using Photoshop lately. In Photoshop I get everything scaled correctly and then when I go to print the jpg that I have created it either prints too small or too large. An example would be: I created a label that I specified to be 8 inches long and when I printed it, the label came out to about 7.5 inches. Proportionally it seems ok but it's still off. The only thing I can think of that is messing things up is that the files I have made are 150 DPI and the printer at work only prints at 300 and 600 DPI. Could that be the issue?
Welcome to the forum.
The resolution of the printer will not effect the printing size.
Have a look at Image > Image Size dialogue and in that at the resolution, if the resolution is (say) 200 PPI (pixels per inch), then an image that is (say) 800px x 1200px will print at 4 x 6 inches.
You can adjust the sizes and resolution in the Image Size dialogue box. Experiment to see how it works.
If you want a different aspect ratio, use the Crop tool.
Like all Photoshop things, there are other ways of undertaking this activity and, depending on your version, non-destruction methods, but my description will get you started.
For more information, have a look at this tutorial: .Photoshop image size and resolution