I scanned something pages through a library’s HP4080 scanner into tif format. It can be viewed very well on the connecting desktop and also I was even able to select the text in MS office image software. However, when I brought the stuff back to my laptop. They just showed the first pages. On windows, I found a software called bravo to check into all the frames every tif file contained. But for that freeware, you can’t expect it to extract the pages out.
Then on linux, I found a very good software called XnView, which can extract all the images out and since they were very big at the same time this stuff can help you resize and convert to grey to finally give out png images with reasonable sizes. Although the resulted images don’t afford selected text any more, I’m still happy with that.
Then with these png files, I can use “convert” command, which is from ImageMagick, to merge and transform into pdf files.