you should also look at this: http://johannes.sipsolutions.net/Projects/ls5000
perhaps it will be useful? allan On Thu, May 28, 2009 at 6:30 AM, Lassi Tuura <lat at cern.ch> wrote: > Hi, > > SANE pages say LS-50 (Coolscan V) is "Minimal". Can I ask what exactly this > means? > > I have a LS-50 and am considering a custom open-source scanning application > for a specific purpose of mine. At present I am pretty much completely > ignorant about how LS-50 even works, or in fact any scanner, but am planning > to learn. > > I am interested in maximum-quality raw capture out of the scanner and will > do my own processing on the data afterwards. So I won't need most auto-* > features, and need completely unprocessed colour. > > The workflow I am interested in: > > 1) Preview at 64-bit RGBI at 1000 dpi. Auto-focus on app-specified x/y > point. If strip film feeder, preview all frames in one go. Detect film ends, > frame position if possible, or provide app enough information to do so. If > it's possible to scan entire strip in one go, works well for me, but I can > do per-frame processing too. Return unprocessed raw RGBI data. > > 2) Do app processing on the info, including: identify frames and/or select > frame positions; identify frames to scan; identify auto-focus point for each > frame; identify exposure parameters. > > 3) Scan at 64-bit RGBI at 4000 dpi: scan each of the selected frames N times > each with N different exposure settings, returning back unprocessed raw RGBI > data for each scan. Again scanning entire strips in one go is fine, as is > working frame at a time. (Q: how accurate is the step motor movement?) > > I would handle all exposure and colour conversion myself. I will do > full-frame scans so don't need to select a crop area to scan. I will do > multiple exposures of each frame. I am looking for having complete control > over exposure settings so they are deterministic across frames (no auto-* > except for focus). > > I was reading coolscan3.c source code but it wasn't obvious to me which > features on LS-50 are supported or not supported, or how it interacts with > the strip film feeder. > > I expect to code whatever is missing if I go ahead with this project; I am > just looking to find out what exists and what is missing, and what is known > about LS-50 commands or behaviour. > > Lassi > > -- > sane-devel mailing list: sane-devel at lists.alioth.debian.org > http://lists.alioth.debian.org/mailman/listinfo/sane-devel > Unsubscribe: Send mail with subject "unsubscribe your_password" > ? ? ? ? ? ?to sane-devel-request at lists.alioth.debian.org > -- "The truth is an offense, but not a sin"
