With OMR scanning software sheets which are damaged, not clearly visible or having distortion in them is not a problem as it can read such images easily. A user must make sure that the brackets of sheet holder where sheets to be scanned are usually placed must be closed properly. This is necessary to avoid undesired titling, tangling and other similar problems. This is one of the very important OMR sheet scanning precautions.
Always scan at default settings. Boosting brightness, contrast and other features can create problems if used without guidance.
Make sure index points of corner have suitable white space so that they can be scanned properly. This is possible by keeping scanning portion as wide as possible for user.
If images are Black & white, scan them as one-bit images. Grayscale and color photo can boost the file size so don’t scan at such options when there is no need of same.
Sheets that have any form of snap on them or the ones that have multiple color printing, it’s good to scan as color image than Black & White or Grayscale. It helps keeping photo clear and visible.
150 DPI scanning must be preferred for images having OCR, Photograph and Barcode.
Files must be saved in DIF or in BMP format only. Saving files in PDF, JPEG or in Doc must be avoided.
Use single file format in case you are considering DIF format. This creates different file for each image rather than one file for all. Multilayer/multipage TIFF should be avoided as it can insert all images into dissimilar layers of a specific file. Always keep it in mind that you need to have a separate file for all the images which are scanned.