You may mean 'scanning' . This has at least two meanings, the older one being to read a document or book quickly by 'scanning' over the print and getting the gist or meaning without reading every single word. The newer meaning comes with computers and is the act of putting photos or documents on a 'Scanner' or 'copier' and entering them as data into a computer.
Skanning is the luhya word for the English word scanning.
skimming means to read the first sentence of a pargraph which gives you the main idea of the whole paragraph, but skanning to move your eyes quikly across the lines to see if there is any similar word or phrase yoy can spot.