The OMR Sheet Reader Software (or OMR Sheet Scanner Software) uses scanned images of OMR sheets to extract and evaluate data.
With Addmen OMR Software, users enjoy maximum flexibility in scanning OMR sheets using regular image scanners.
To ensure accurate and efficient OMR data reading, certain scanning parameters and technical specifications must be followed.
Our scanning software supports three principal modes: RGB colour, Grayscale, and Black & White (1-bit).
For typical OMR answer-sheet scanning your best choice is Black & White (1-bit) mode — smaller file sizes, faster scanning and processing.
The DPI (Dots Per Inch) setting determines the resolution of the scanned image.
The Addmen OMR Sheet Reader Software delivers 100% accuracy even at lower DPI levels.
Scanning at 100 DPI is perfectly accurate and efficient.
Higher DPI does not mean higher accuracy — it only increases file size and slows down scanning.
If your scanner does not support 100 DPI, you can safely use 150 or 200 DPI.
Lower DPI ensures smaller file size and faster data processing.
Conclusion: 100 DPI scanning is optimal for most OMR applications and ensures balance between accuracy and performance.
| Type of OMR Sheet | Recommended DPI | Scanning Mode |
|---|---|---|
| Standard OMR Answer Sheet | 100 DPI | Black & White |
| OMR Sheet with Barcode / OCR / ICR | 200 DPI | Colour or Grayscale |
| High-Resolution Requirement (Optional) | 150 DPI | Black & White |
You can scan OMR sheets into JPG, TIFF, or BMP formats — all commonly supported by document-feeders or flat-bed scanners.
If sheets are scanned in multi-page TIFF, the software can split them into single-page TIFFs for reader ingestion.
Smaller file sizes via B&W mode + 100 DPI + optimized format = faster uploads, lower storage cost, quicker processing turn-around.
If your answer sheet includes barcode strips, OCR text fields, or ICR (intelligent character recognition) zones, increase scanning specification: use 200 DPI and scan in colour or greyscale/B&W accordingly.
This helps ensure the machine-reading of those advanced fields is accurate and reliable.
Accuracy: Proper DPI and mode ensure every mark, bubble and barcode is reliably captured and read.
Speed & throughput: Lower file sizes + optimal modes allow large volumes of sheets to be processed rapidly.
Cost efficiency: Less storage space, faster upload/download, quicker turn-around = lower cost per sheet.
Scalability: These specs allow you to scale from thousands to hundreds of thousands of sheets without technical bottlenecks.
Flexibility: Whether you scan in-house or outsource scanning, aligning to the right format and mode ensures compatibility with the reader software.
Choose Black & White (1-bit) mode for basic OMR sheets unless colour/greyscale needed.
Set DPI to 100 if possible; escalate only when required by advanced fields.
Save scanned sheets in TIFF (preferred) or JPG for web-/result-based use.
If using barcodes/OCR/ICR: scan at 200 DPI, use colour/greyscale, ensure reader software supports the fields.
Use multi-page TIFF splitting if your scanner output is multi-page.
Maintain consistent sheet orientation, proper feeder settings, clean sheet passes to avoid scan errors.
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