| ||
| | |
| Understanding Scanners/Monochrome images and Optical Character Recognition (OCR) | Index | Home |
| ||
Text appears dim when using OCR |
Image with dim letters |
This is caused because the threshold value is set too low and can be corrected by increasing the monochromatic threshold level and re-scanning. |
Setting the monochrome threshold higher |
The noise has been reduced |
The appearance of the image can be improved with image editing software. After scanning with 256-color gray scale, use the tone curve and nonlinear (gamma) correcting feature to clean the background while leaving the text clear. |
Compare:Understanding Scanners/OCR generates noise around text |
TOP