# Re: Scan ahead

From: Peter Kirchgessner (peter@kirchgessner.net)
Date: Fri Mar 30 2001 - 12:09:01 PST

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  Hello Marius,

  I dont know a scanner that can store a single frame completely. For an
  A4 scan at 600 dpi with 24bit you would need about 100MB of memory.
  Maybe this works for b/w scans at low resolution. But in that case I
  suppose the scanner will not accept to start a new scan when the image
  has not been read completely.

  Sincerely

  Peter

  > JFL Sane Dev wrote:
  >
  > Hi,
  >
  > I am a beginner with SANE. Could anyone tell me please how should a
  > scan-ahead (automatic scan, the scanner scans asynchronously at
  > highest possible speed to its internal memory buffer, the driver reads
  > images at its own speed from the scanner buffer) image acquisition
  > sequence be implemented in a SANE session?
  >
  > If the driver starts the scanner in automatic mode at first sane_start
  > it receives, would the application have to not request sane_cancel
  > until all images are transferred?
  >
  > If the application would call repeatedly sane_start +
  > sane_read_until_SANE_STATUS_EOF for each image, and then call
  > sane_cancel when sane_start (or sane_read) returns
  > SANE_STATUS_NO_DOCS? Would this be the correct procedure?
  >
  > Thanks,
  > Marius Niculescu

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