Forums › TWAIN Classic › how to change or set Resolution or dpi before scanning?? › Reply To: how to change or set Resolution or dpi before scanning??
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set the Units first. 500×500 has little context to most devices, or worse it has an erratically incorrect context, unless you set the units first. I’m going to go out on a limb and guess that 500in is well beyond your device’s ability.
see the ‘Capability Ordering’ document http://twain.org/docs/CapOrderForWeb.PDF for more on what capabilities to set in what order.