[sane-devel] SANE LS-50 (Coolscan V) support in coolscan3.c?

m. allan noah kitno455 at gmail.com
Thu May 28 11:56:53 UTC 2009

you should also look at this:


perhaps it will be useful?


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
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