Adobe Lightroom Classic 14.0.1
Window 11 Home 23H2 fully patched
When printing a 16 x 9 ratio horizontal image in landscape orientation on a 19 x 13 in sheet, I set all margins for 0.25 in, the page grid for one row and one column, the cell size width to 16.125 in (which is rounded to 16.13 in the application) and leave the cell size height to the maximum. The resulting printed image is 16.1875 in or 1/16 in larger than the set size. When I set as above with a cell size width of 16 in, the resulting printed image is 16.09375 in or 3/32 in larger than the set size.
However, when printing a square image in portrait orientation, set the cell size width to 12.125 in and leave the cell height to the maximum, the resulting printed image is as it should be, 12.125 in square.
Interestingly, if I open the 16 x 9 ratio horizontal image in Photoshop 26.0.0 and change the image size width to 16.125 in, the resulting printed image is exactly the same as above at 16.1875 in.
While 1/16 in may seem like a quibble, it's not when using bulk pre-cut mats.
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