Commit `f9f8cb8167`

f9f8cb81671915b6b187d1c7f3cb48056b6390a3

Verified · cmc

cmc <hello@cleberg.net> · 2026-09-26 19:17 UTC

Round aperture to two significant figures

exiftool -n reports the raw FNumber (1.779999971), which was printed
verbatim as f/1.779999971.

Layout: unified · split

internal/format/exif.go +3 −1

 	}
 	m.Camera = camera(e.Make, e.Model)
 	if e.FNumber > 0 {
-		m.Aperture = "f/" + strconv.FormatFloat(e.FNumber, 'f', -1, 64)
+		// Two significant figures, as f-numbers are written (0.95, 1.8, 5.6, 22);
+		// exiftool -n reports the raw value, e.g. 1.779999971.
+		m.Aperture = "f/" + strconv.FormatFloat(e.FNumber, 'g', 2, 64)
 	}
 	m.Shutter = shutter(e.ExposureTime)
 	return m, nil

internal/format/exif_test.go +12

	@@ -81,3 +81,15 @@ func TestParseExifErrors(t *testing.T) {
81	}	81	}
82	}	82	}
83	}	83	}
		84
		85	func TestParseExifRoundsAperture(t *testing.T) {
		86	for in, want := range map[string]string{"1.779999971": "f/1.8", "2": "f/2", "5.6": "f/5.6", "11": "f/11", "22": "f/22", "0.95": "f/0.95"} {
		87	m, err := parseExif([]byte(`[{"ImageWidth": 1, "ImageHeight": 1, "FNumber": ` + in + `}]`))
		88	if err != nil {
		89	t.Fatal(err)
		90	}
		91	if m.Aperture != want {
		92	t.Errorf("FNumber %s: got %q, want %q", in, m.Aperture, want)
		93	}
		94	}
		95	}

Commit f9f8cb8167