TwainGetAvailableBrightnessCount = 0?

[Slava]

Hi,

I am doing some tests with GDTWAIN 410/411, and i see that twain value arrays (resolutions/brightness/contrast/bitdepth) are differently interpreted by gdtwain for each scanner (at least with my scanners).

in some cases is TwainGetAvailableBrightnessCount = 0 !?

I have attached the test program with delphi source.

The controls i have created for twain setup cannot work correctly because of these totally different array architectures on each twain driver. Is this normal behavour? Can i do something about it?

Slava

[Loïc]

Hi,

The controls i have created for twain setup cannot work correctly because of these totally different array architectures on each twain driver. Is this normal behavour? Can i do something about it?

Yes it is a normal behaviour. It is why methods such as TwainGetAvailableBrightnessCount(), TwainGetAvailableContrastCount(), TwainGetAvailableBitDepthsCount()... are implemented.
Each scanner & each driver of them provide specific capabilities. These methods should help you to dialog with each scanner driver using supported values.

However one thing seems strange to me: the number of supported resolution and the number of supported brightness values of the HP scanjet 5590 TWAIN driver. To check that, I will get this model within few days. I'll report result into this topic.

Best regards,

Loïc Carrère