OCR Processing Page Limits

The CONTENTdm OCR Extension enables you to process a certain number of pages per month, depending on your license level. (You can check your page counts by reviewing the page limit on the OCR tab in the Project Settings Manager).

The pages are measured according to the international paper standard of A4: approximately 8.27 inches x 11.69 inches, which is 96.68 square inches. The US standard letter size of 8.5 inches x 11 inches, which is 93.5 square inches, is three inches smaller than A4 and counts as one processed page. If the pages exceed size A4, you will receive a warning that processing the page will exceed the single page scan size and will be counted as more than one page. You can cancel the process, if you do not want to proceed. If you do not want to be warned about oversized images in the future, you can choose to suppress the warning message.

If the page that you are scanning is larger than A4, the number of pages counted will be equal to the area of the page divided by the A4 area (96.68 inches). The result is rounded to the next whole number. For example, if you are processing a tabloid page that is 11 inches x 17 inches, the area of that page is 187 square inches. 187 is divided by 96.68, resulting in 1.93. This means that an 11 x 17 page will count as two processed pages.

If you know the dimensions of your image in pixels, use the following formula to determine the size in inches:

(Pixel width) / (X resolution) * (Pixel height) / (Y Resolution)

For example, if you have an image that was scanned at 72 pixels per inch and the image is 1200 pixels wide by 1600 pixels high, using the above formula (1200/72 x 1600/72), the dimensions are 16.66 inches wide x 22.22 inches high (370.19 square inches). Divide that by the A4 value, which results in 3.82 pages (or 4 pages, rounded to the next whole number).

General guidelines for A4 dimensions in pixels are:

72 dpi = 595 X 842 pixels
300 dpi = 2480 X 3508 pixels
600 dpi = 4960 X 7016 pixels

The following table is a quick reference for the above formulas and dimensions.

A4 paper size in inches: 8.27 x 11.69 (96.68 square inches)
To determine size in inches when given pixels:
(Pixel width)/(X resolution) * (Pixel height)/(Y Resolution)
To determine number of pages counted toward processing:
Area of the page/Area of A4 (96.8)