Scan resolution in microns	10	20	30	40	50	60	80	160
Scan resolution in DPI	2540	1270	847	635	508	423	318	159
File size of a full- frame B&W image	576	144	64	36	23	16	9	2
File size of a full- frame color image	1728	432	192	108	69	48	27	7
Photo scale 1:	10 microns	20 microns	30 microns	40 microns	50 microns	60 microns	80 microns	160 microns
Photo scale 1:	2540 dpi	1270 dpi	847 dpi	635 dpi	508 dpi	423 dpi	318 dpi	159 dpi
2400	0.08	0.16	0.24	0.31	0.39	0.47	0.63	1.26
3000	0.10	0.20	0.30	0.39	0.49	0.59	0.79	1.57
3600	0.12	0.24	0.35	0.47	0.59	0.71	0.94	1.89
4000	0.13	0.26	0.39	0.52	0.66	0.79	1.05	2.10
4800	0.16	0.31	0.47	0.63	0.79	0.95	1.26	2.52
5000	0.16	0.33	0.49	0.66	0.82	0.99	1.31	2.62
6000	0.20	0.39	0.59	0.79	0.98	1.18	1.57	3.14
7200	0.24	0.47	0.71	0.94	1.18	1.42	1.89	3.77
8400	0.28	0.55	0.83	1.10	1.38	1.65	2.20	4.40
9600	0.31	0.63	0.94	1.26	1.57	1.89	2.52	5.03
10000	0.33	0.66	0.98	1.31	1.64	1.97	2.62	5.24
12000	0.39	0.79	1.18	1.57	1.97	2.36	3.14	6.29
15000	0.49	0.98	1.48	1.97	2.46	2.96	3.93	7.86
15840	0.52	1.04	1.56	2.08	2.60	3.12	4.15	8.30
18000	0.59	1.18	1.77	2.36	2.95	3.55	4.72	9.43
20000	0.66	1.31	1.97	2.62	3.28	3.94	5.24	10.48
24000	0.79	1.57	2.36	3.15	3.94	4.73	6.29	12.58
30000	0.98	1.97	2.95	3.94	4.92	5.91	7.86	15.72
40000	1.31	2.62	3.94	5.25	6.56	7.88	10.48	20.96
1/2 foot/pixel and 1 foot/pixel boxes are highlighted
1/2 foot/pixel and 1 foot/pixel boxes are highlighted



To convert microns to dpi: 25,400/microns = dpi (Example: 25,400/30mm=846 dpi) To convert dpi to microns: 25,400/dpi = microns (Example: 25,400/846dpi = 30mm) To calculate file size in megabytes: Length in inches x resolution in dpi = lines Width in inches x resolution in dpi = columns Lines x columns/1,000,000 = file size in megabytes Example: 6" x 7" area on a frame scanned at 846 dpi - 6 x 846 = 5076 7 x 846 = 5922 5076 x 5922 / 1,000,000 = 30 megabytes







To calculate ground pixel size: photo scale / resolution in dpi / 12 = ground pixel size in feet photo scale / resolution in dpi / 39.6 = ground pixel size in meters