test

README.md

@@ -99,10 +99,11 @@ To use a different camera:
   automatically after a successful print. (If the program is restarted
   mid-cycle, photos here are counted so no progress is lost.)
 - `contact_sheets/` — every printed sheet, kept as a backup in case of
-  printer trouble. Sheets are full US-letter pages at 300 DPI, so they
-  also print at the right size from any other app. Delete them manually
-  now and then, or set `delete_contact_sheets = true` in the config to
-  remove each one right after it prints.
+  printer trouble. Each sheet has two files: a `.jpg` (handy for viewing)
+  and a `.pdf` twin — the PDF is a full US-letter page at exactly 300 DPI
+  and is what actually gets sent to the printer. Delete them manually now
+  and then, or set `delete_contact_sheets = true` in the config to remove
+  each one right after it prints.
 
 ## If printing fails
 
@@ -111,9 +112,12 @@ The booth doesn't lose anything: the contact sheet is saved in
 sheet by hand with:
 
 ```bash
-lp -o media=letter -o fit-to-page contact_sheets/sheet_XXXX.jpg
+lp -o media=letter -o fit-to-page contact_sheets/sheet_XXXX.pdf
 ```
 
+(Print the `.pdf`, not the `.jpg` — the PDF's page size is exact, so the
+printer can't stretch the photos.)
+
 Common causes: printer off or unplugged (`lpstat -p` says "disabled" —
 re-enable with `cupsenable PRINTER_NAME`), or no default printer set.