8.0

ABBYY FineReader 8.0 User’s Guide
14
ISO Speed
In poor lighting conditions, be sure to select a higher ISO setting.
Focus
Autofocus may not work properly in poor lighting conditions. If this is the case, focus the camera manually.
White Balance
If your camera allows, use a white sheet of paper to set white balance. Otherwise, select the white balance mode which best suits the
current lighting conditions.
Additional Recommendations
Insufficient lighting will cause the camera to increase expositions, which may have an adverse effect on the sharpness of the resulting
picture. Try the following:
● Enable the anti–shake system, if available.
● Use autorelease to prevent the shaking of the camera caused by pressing the shutter release button.
What do I do if...
The picture is too dark and low–contrast
Try using additional light sources. Otherwise, open up the aperture.
The picture is not sharp enough
Autofocus may not work properly in poor lighting or when trying to photograph the document from a close distance. In poor lighting
conditions, try using an additional light source. When photographing a document from a close distance, try using the Macro (or Close–
Up) mode. Otherwise, focus the camera manually if manual focus is supported by your camera.
If only a part of the picture is blurred, try a smaller aperture. Increase the distance between the document and the camera and use the
maximum zoom. Focus on a point somewhere in between the center and a border of the image.
The flash causes a glare in the center of the picture
Turn off the flash. Otherwise, try photographing from a greater distance.
Working with an Image
Despeckle image
The recognized image may contain a large amount of "dust" (i.e. excess dots) if the original is medium–to–low print quality. Dust,
when it resides close to character outlines, may adversely affect recognition quality. To decrease the number of dots:
● Select Despeckle Image from the Image>Image Adjustment menu.
To despeckle a particular block:
● Select Despeckle Block from the Image>Image Adjustment menu.
Note: Despeckling may decrease recognition quality if the original document is very faint or contains a light font. Very small
characters, such as periods or commas, and parts of very thin characters may disappear.
Change image resolution
Image resolution shows the fineness of detail that can be distinguished in an image and is measured in dots per inch (dpi). ABBYY
FineReader shows best OCR performance when vertical and horizontal resolution is the same and is in the range from 50 to 3200 dpi.
The recommended range is 200–600 dpi, and the recommended setting is 300 dpi.
If image resolution is too small or too large, this may have an adverse effect on the quality of OCR.
Some image formats, e.g. *.bmp files, have no resolution. Sometimes an image may have non–standard resolution, e.g. 204*96 dpi,
which may also adversely affect the quality of OCR.
ABBYY FineReader checks the resolution of each image and corrects if required, leaving the image dimensions unchanged. Images
whose resolution has been corrected by the program are marked with
in the Batch window. Place the mouse cursor over such an
image to see a pop–up tip.
If OCR quality for a particular image is poor, changing its resolution may help improve the quality. To change the resolution of an
image marked with
.
● In the Batch window, select the image marked with whose resolution you wish to change. If the pop–up tip
says that the image has invalid resolution, select the Correct Resolution command from the Image menu.