Set ICAP_Contrast by coding with hide user interface dialog

[xostar1]

Hi, I’m programming on java to control ICAP_CONTRAST without UI dialog. Once I hide the UI setShowUserInterface(true). I cannot re-scan again and error occurred as below

==========================================
Failed during call to twain source.
cc=Capability not supported by source
rc=1
==========================================

[spike]

Hi xostar1 – can you tell if that error is happening specifically when the code tries to set ICAP_CONTRAST?

If so, maybe your scanner doesn’t support ICAP_CONTRAST – that would be odd, but after all it isn’t a required capability.

What scanner are you testing with?

[xostar1]

Hi Spike,

I’m sure I can set apply ICAP_CONTRAST on first scan. Once I trigger the scanner scan again and its prompt error. But I found that I only able to control the Contrast by using UI (setShowUserInterface(true)).

I have tried 3 different model scanner (Kodak i65, i1420, i2600).

[spike]

Hi xostar1 – So: the error happens every time, on the 2nd scan, with three different Kodak scanners?
Maybe the problem is not with ICAP_CONTRAST, but something is in the wrong state after the 1st scan.

It is very odd though, because that is such a specific error report. It is not the error I would expect if the driver was not open, or was in state 5,6 or 7.

Do you close the scanner after the first scan?
Each time you set ICAP_CONTRAST, do you set ICAP_PIXELTYPE first?

What code or library are you using to control the scanner?

[xostar1]

Hi Spike,

I have attached the sample file. You may try on it. Press “Acquire” first time – Console show OK and scanned image ok. Second time – Adjust Contrast Value by Scroll. Scanned image seem ok, but console error show as below. But not sure whether I can ignore the console.
=====================================
9Pixel Type: Failed during call to twain source.
cc=Capability not supported by source
rc=1
=====================================

[Author]

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