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Check the pixel dimensions of a photo strip
Measure the file you will send, not its screen preview.
A picture’s apparent size on your screen tells you little about the number of pixels in the file. Inspect the finished export before ordering prints.
Open file information
Use your device or editor’s image-information view to find width and height in pixels. Record them with the intended orientation. File size in megabytes answers a different question. A compressed picture and an uncompressed one can have similar dimensions while taking very different amounts of storage.
Compare with the planned print
Choose the physical print dimensions and the pixels-per-inch target requested by your printer. For an illustrative calculation, a 2 by 6-inch strip at 300 pixels per inch uses 600 by 1800 pixels. This is arithmetic, not a guarantee that every source face contains enough detail.
Check the exported version
Repeat the check after delivery or conversion. A received image may differ from the master you inspected earlier. Keep the dimensions in your print instructions and make a measured proof before ordering many copies. A metadata label alone should not replace inspecting the actual pixels.