Image Quality
Image Quality
Another aspect to consider is Readiris can only convert images that are correctly oriented. It will not work if
they are sideways or upside down. If you find this happens use the rotate tool to turn the image or click the
Settings
and select
Detect page orientation
prior to the scan and the program will do it for you.
Since Readiris works by comparing images of letters to known letter shapes and making the conversion. It
depends on crisp clean letter shapes to do this. If the image is to light or dark then the results suffer. Below
are actual results from the program and the images it was working with.
"Autoformatting" recreates a facsimile copy of the original document: the text blocks, graphics and tables are
recreated in the same place and the word and paragraph formatting are maintained across the recognition.
"Autoformatting" recreates a f(ICsimile cop." of the original document: the te:\t blocks. graphics and tables arc
recreated in the same place and the word and paragraph formatting are maintained across the recognition.
II Autoformtlftina" recreates a ltalmo. copy of the arigiDal docummt: the tat b1ocb, pIphics and tables Il'e
recnatecl in the IIIIIle pl8ce 8Dd the word 8Dd paraanph farmtlfti"l Il'e maintJtinM ICI'OIIthe recopition.
The way to cope with the situation is to scan or rescan the document in grayscale. This will allow you to adjust
the image within Readiris to either lighten or darken as needed. See the next page for an explanation of this
process.
This is the ideal image to work with as
seen from the perfect results.
This image is too light. The letter shapes
begin to have gaps and incomplete
shapes. Since this is not to extreme
there is about 75% accuracy. There
would be a lot of needless clean up to
deal with in the output document.
This is too dark. Here the letter shapes
begin to fill in and become fuzzy. Letters
like a, e, and o’s are almost completely
obscured.
Accuracy is reduced to about 20% which
is not usable.
