clemd973 wrote:Can you sharpen the text in your sample?
Not really. I would have to introduce more colors around the edges of the letters to smooth the transition from black to white (or color to white), but compression becomes more efficient with fewer colors. I might play with it just to see what happens, but I'm not expecting that it would be worth it. (ooohh... or there's a thought: keep the edges in a low resolution background layer... probably still won't be worth it)
You mentioned Clear Scan, but in a way that's a whole other world. From what I understand, Clear Scan makes the text into vectored images, whereas djvu is made for raster images. A vectored image can be zoomed to infinity, but a raster image is supposed to be viewed at a specific DPI and not zoomed. Now, from what I've seen in my samples, if the raw input from the camera has sufficient resolution (mine come in at ~370 dpi for smaller books) there is no visual difference between vector and raster until the zoom exceeds 300% or so.
Even if I could get the text sharper, I don't think I would work that into djvubind. Other than encoders that have lossy compression, djvubind does no modifications to the input images, enhancements or otherwise. I intend to keep it that way, so that there is a clear difference between post-processing software like Scantailor which enhances images and binding software like djvubind that puts everything together into a single file.
clemd973 wrote:[P]retty soon I'll be scanning the funeral rite, also containing colored text; if your interested in those images as well. Let me know.
Sure, that would give me two different sources, which should help test things.