Be sure to set your scanner’s software to full, 24-bit color. Turn on Scale to Fit if you want your backgrounds to be the same size as your drawings. Otherwise FlipBook will not scale them and they we be as big as their image resolution allows. FlipBook has this option so you can scan in backgrounds that are bigger than the frame size in order to pan around or zoom in on them.
When you’re scanning cels for standard TV resolution we recommend that you set your scanner to 300 DPI and scan in pure black and white. This method has several benefits. It allows FlipBook to scale the images down to the actual frame size and anti-alias the images so you get smooth lines without jaggies. It also lets FlipBook make the white part of the page perfectly transparent and that helps the painting process to go much faster and produce better results.
If you’re scanning for HD resolution you should scan at 600 DPI but everything else remains the same.
When scanning overlays the scanner doesn’t know which part of the image you want to be transparent. But FlipBook has an option to create an alpha channel and make anything that is pure white, or close to it, transparent. Just put a checkmark in the Overlay checkbox and then you can set the keying value. Keying is a term for making part of the image transparent. If the value is set to 255 then only pixels that are pure white will become transparent. Usually a number that’s a little lower will produce better results. Experiment to find the number that produces the results you like best.
In addition to making the white pixels transparent, FlipBook will also put a slight blur on the edge to produce a smoother transition. This is a quick and easy way to make the white part of your images transparent but will not produce perfect results in all cases. For better results you will need to buy a program that specializes in creating alpha channels or make your own in Photoshop.
AutoScan is our feature that finds the pegholes in the images and lines them up to make sure they registered. It is meant to be used with scanners that have automatic feeders and to make up for the variability of the feeder. To use AutoScan you must scan in pure black and white at 300 DPI or more. Set the scanner to include the smallest area the surrounds the images and the pegholes. If the selected area is too large FlipBook may not find the pegholes. Once FlipBook finds the peghole, the last setting to adjust is the brightness. You need a brightness setting that produces well-defined pegholes with sharp edges. Then FlipBook will rotate the images as needed, position them consistently and crop the pegholes.