[sane-devel] New Epson Scanners

[Till Kamppeter]

Here it goes, download it from

http://www.linuxprinting.org/till/tmp/EpsPerf1260TPA.png

It is a 100-dpi scan of the entire glass with the TPA frame for 
negatives on the glass taken in normal mode (with transparency mode one 
cannot scan the whole glass).

To make the exact borders of the holes more easily visible (no shadows) 
I gave back light to the frame by putting an Epson Perfection 2450 at 
the side of the 1260, connecting the 2450 to another machine and on the 
other machine I did a pre-scan in transparency mode so that the 
backlight in the lid of the 2450 went on. Then I put the lid of the 2450 
onto the 1260 so that it illuminates the TPA frame.

The slide frame is available under

http://www.linuxprinting.org/till/tmp/EpsPerf1260TPAslide.png

(also 100 dpi, entire glass).

The calibration window and the holes to fix the TPA lamp are exactly at 
the same position. When one puts both frames one on the other one sees 
that the negative window is in the center of the slide window.

With th two image you must be able to determine the window positions 
(not only the calibration window but also the negative and slide 
windows) with an accuracy of 1/100 inches (100 dpi), this accuracy is 
higher than the one with which one is able to position the frames on the 
glass.

    Till


Gerhard Jaeger wrote:
> Hi Till,
> 
> thanks you for the scan positions. You might also tweak the shading position,
> which can be done in the plustek-devs.c file around line 595. This position
> will tell the driver where to find the calibration strip for negative and 
> transparency scanning. In general this is only a field which is not covered
> by the transparency - can you check this? Or can you to a positive scan of
> the TPA itself so I might be able to detect this strip?
> 
> Thanks
>   Gerhard
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