Is it possible to change the maximum WIA scanning resolution?

2
votes

I have to use the Canon 9000F scanner in a project. I am having some troubles with the TWAIN driver (see: Are memory issues common when scanning 2400 DPI pictures with TWAIN?), so I tried WIA as an alternative, but the built in scanning dialog only allows a maximum resolution of 600 DPI, but I know that at least 1200 DPI should be possible.

WIA dialog

Is it possible to override these values? Where do the limitations come from? Is this caused by the driver or is this configured somewhere in WIA itself? If I went to down to a lower level and do all these scanning functions myself would I face the same limitations?

Question no longer relevant. Decided to use the TWAIN driver.

1
wiaimage-scanner

1 Answers

2
votes

I'm sure you've probably found another solution by now, but I stumbled across this post today while I was fighting a similar problem and I'd like to share my workaround.

In my case, we are using a Plustek A320 scanner which supports up to 1600dpi optical resolution. The actual TWAIN driver seems to cause issues (frequent memory errors like you were seeing) so I wanted to try it using the WIA driver. Of course, the resolutions that WIA lets you choose only go up to 600.

What I eventually settled on was some driver inf hackery. I edited the 261U.inf file packaged with the driver installer, adding the bolded line in along with this section:

[IPCProduct.DeviceData.WIA]

TwainDS=%TwainDSName%

Server=local

MicroDriver="mic-261U.dll"

UI DLL=sti.dll

UI Class ID={4DB1AD10-3391-11D2-9A33-00C04FA36145}

Resolutions="75, 100, 300, 600, 1200"

I then manually reinstalled the driver through Device Manager, explicitly selecting the appropriate .inf file. After a reboot, I'm able to select the 1200dpi resolution when initiating a scan via the Windows Image Acquisition wizard.