Brief Description and Instructions

This software should work with many HP scanners and was adapted to work with the 
- Canon MG 6250 printer/scanner,
- Epson Perfection 1640 SU scanner,
- HP Officejet 6700 and
- HP All-In-One C410 

Features:
- Automatic scanner detection at program start
- Selection of scanner (if more than one)
- Support of Sane-Airscan
- Scanner parameters are stored for each scanner individually
- Scanning of standard and custom formats
- Scanning of a freely selectable area (selected area usable as mask)
- Storage in jpg, png, bmp, multipage pdf
- Optional OCR: 
     -Storage as searchable PDF or plain text
     -automatic text layout detection (i.e. multiple columns)
- Printing of scans
- Emailing of scans in PDF format
- Turning of scans in 90 degrees steps
- Inverting colors of scans
- Changing of scan order - also by drag & drop
- Deleting of scans
- Multiselect scan list
- Post scan options (brightness, contrast, gamma)
- Restoring last position of main window after program start
- Resizable main window 

Special Notes to OCR:
For OCR the package tesseract and all required language packages must be installed. The presence of the tesseract OCR software and all installed OCR languages are detected automatically. Good results are obtained at a resolution of 300dpi. B/w or gray is sufficient for OCR. The OCR process may take several minutes at a high numbers os scanned pages. In order to save scans as searchable PDF, please mark the "Searchable PDF" option in the post scan dialogue.

Details:
When double clicking on a scan in the scan list, the main scan-display displays the scan image.
When holding the shift key while clicking on the turn-right key, scans are turned to the left.
GUI controls are deactivated automatically if the scanner (according to SANE) doesn't support the according function.

Special Notes to the Quality Setting/ Slider:
When saving a scanned image in the lossy JPG-format a quality of 90% is a good trade off of quality and file size.
IMPORTANT: The term "quality" actually doesn't fit to PNG, because it is a lossless format. When saving a scanned image in this format a quality-setting of 10% provides the smallest possible file size without any loss of quality. 

Special Notes to Airscan
Airscan requires the installation of the package Sane-airscan. Normally it is pre-installed only on KDE-based Linux distributions. The app should then detect an additional WSD scanner, possibly with a different range of features and functions. The indication of progress doesn't work under Airscan which is not caused by this software. 

14th Dec 2022, Claus Dietrich


