So my thinking now is that changes to contrast, color, brightness, sharpening, etc. are best done "before" upscaling low-def to hi-def. Is this in fact the correct procedure?
I want to start collecting some of the free public domain stuff that's still somewhat interesting. I found some old gold mine maps online, so I want to enlarge some of the details. The maps are hand drawn, but quite detailed. But the resolution is 72dpi on a monitor.
I would ideally like to print out sections on separate pages, like a regular atlas. Probably like to print at 300dpi to 8.5X11 pages, however many it takes.
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I usually do most of the filtering before upscaling. For the most part, I only upscale animated material. Hand drawn maps would probably fit in that category.
OK. Thanks. As a side note, is there any benefit to convert to grayscale?
Most black and white material has a color cast or noise in the chroma channels. I usually convert to pure greyscale. You get slightly better compression when the chroma channels are flat.
Avisynth simple Limiter(0, 255, 128, 128) for YCbCr.
I usually use ColorYUV(cont_u=-256, cont_v=-256) because I'm usually using ColorYUV() anyway. GreyScale() works fine too.
Beware, some other filters cause chroma problems. For example Stab() causes chroma to bounce up and down by a unit.