TwainSetImageLayout: Small images

[ctn]

Hi

I could not set the image layout with the following parameters:

_gdTwain.TwainSetImageLayout(5.1,0.366666666666667,6.73333333333333,0.7);

The return value of this function is false, TwainGetLastConditionCode = TWCC_BADVALUE and TwainGetLastResultCode = TWRC_FAILURE.

It seems that the parameters are out of range. But why? Since the ranges of the A4 format are left=0, top=0, right=8.26, bottom=11.69 (inches).

Could you please investigate?
Thank you
Br, ctn

[Loïc]

Hi,

I've tested your parameters with success using my scanners.

Your scan seems to be unable to apply these values.

Best regards,

Loïc

[ctn]

Hi Loïc

Ok. Thank you.
Br, ctn

[budait]

Is there a way to query the minimal scanning area?

[budait]

Within the TWAIN spec i found following capability to be queried
ICAP_MINIMUMHEIGHT that can be queried. Is GdTwain supporting it?

Just a note:

The experience showed that most of the scanners have a minimal scan area of 1x1 inch.
For example the Plustek OpticSlim 500 does not allow a scan are to be set on the 4th quarted of the available scan area. This means that the left upper point value must be smaller than (maxphysicalwidth /2) and (maxphysicalheight /2)

Is there a possibility to query such a limitation of the scanner?