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dynarithmic / twain_library

Dynarithmic TWAIN Library, Version 5.x
Apache License 2.0
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How to acquire files with different paper direction? #9

Closed LizhuWeng closed 4 years ago

LizhuWeng commented 4 years ago

Hi, I encountered a problem when acquiring a file with the orientation DTWAIN_OR_LANDSCAPE set,

It appears like just the paper size was adjusted, but the image content was not.

test

LizhuWeng commented 4 years ago

After a lot of test，it seems that there's another CAP value to control the scanner direction （Like A4 Lanscape ）， not just by using the Orientation CAP.

Any advice? Thanks!

LizhuWeng commented 4 years ago

The scanner has two sides to choose the paper direction, So how to work with both? Thanks !

direction

dynarithmic commented 4 years ago

Hi,

It is impossible to know what CAP's your scanner supports without a listing of them. You should generate a list of the caps, plus specify the scanner model you're using.

There is an ICAP_SUPPORTEDSIZES cap or calling DTWAIN_SetPaperSize that sets the paper size to use. I don't know if this will help, or if the capability to support what you are seeing is a custom capability (which I would again need the manufacturer and the driver).

LizhuWeng commented 4 years ago

Hi, dynarithmic. Thanks for reply.

I found that if not explicitly do calling DTWAIN_SetPaperSize, the result was right. but the other side still need to be set as DTWAIN_FS_A4.

Oddly enough, If I set explicitly DTWAIN_FS_NONE, it scans the whole max area.

LizhuWeng commented 4 years ago

SUPPORTED SIZE: 54，54， 4，1，0， 3，5，29，2. (Here I don't know 54 stands for what size)

ProductName: "Plustek OpticPro A380L-TWAIN Family: "Scanner" Manufacturer: "Plustek Inc." VersionNo: "0.0" CAPs: ICAP_BRIGHTNESS ICAP_MINIMUMWIDTH ICAP_PIXELTYPE CAP_ENABLEDSUIONLY CAP_SERIALNUMBER ICAP_CONTRAST ICAP_BITDEPTH ICAP_IMAGEMERGE CAP_AUTOMATICSENSEMEDIUM ICAP_BITORDER ICAP_MIRROR ICAP_PLANARCHUNKY CAP_DEVICEONLINE CAP_DOUBLEFEEDDETECTION ICAP_ORIENTATION ICAP_AUTOMATICBORDERDETECTION ICAP_COMPRESSION CAP_CUSTOMDSDATA ICAP_UNDEFINEDIMAGESIZE CAP_EXTENDEDCAPS CAP_FEEDERENABLED ICAP_IMAGEFILEFORMAT CAP_INDICATORS ICAP_AUTOMATICROTATE ICAP_PHYSICALHEIGHT ICAP_AUTOMATICDESKEW ICAP_PHYSICALWIDTH ICAP_PIXELFLAVOR ICAP_SUPPORTEDEXTIMAGEINFO CAP_SUPPORTEDCAPS CAP_UICONTROLLABLE ICAP_UNITS ICAP_HIGHLIGHT CAP_XFERCOUNT ICAP_JPEGQUALITY ICAP_SHADOW ICAP_XFERMECH ICAP_XRESOLUTION ICAP_AUTOMATICCOLORENABLED ICAP_YRESOLUTION CAP_INDICATORSMODE ICAP_THRESHOLD CAP_DEVICEEVENT ICAP_SUPPORTEDSIZES ICAP_NOISEFILTER ICAP_GAMMA CAP_DUPLEX ICAP_LIGHTSOURCE CAP_PAPERDETECTABLE ICAP_ROTATION ICAP_FRAMES ICAP_XNATIVERESOLUTION ICAP_YNATIVERESOLUTION ICAP_MAXFRAMES ICAP_FLIPROTATION ICAP_MINIMUMHEIGHT ICAP_XSCALING CAP_SUPPORTEDDATS ICAP_YSCALING CAP_DOUBLEFEEDDETECTIONLENGTH ICAP_EXTIMAGEINFO CAP_FEEDERORDER CAP_FEEDERALIGNMENT ICAP_BARCODEDETECTIONENABLED ICAP_SUPPORTEDBARCODETYPES CAP_CUSTOMBASE + 100 CAP_CUSTOMBASE + 111 CAP_CUSTOMBASE + 114 CAP_CUSTOMBASE + 115

NumCaps: 69 CustomCaps: 4 ExtendedCaps: 0

LizhuWeng commented 4 years ago

Here's the driver file

dynarithmic commented 4 years ago

Thanks. I'll take a look. The value of 54 is for TWSS_MAXSIZE. It basically says to acquire the entire acquisition area of the device.

dynarithmic commented 4 years ago

I have not been able to go further with the issue, since I would basically need the scanner to duplicate. I will close the incident, unless you need further assistance. Also remember that the source code is available to you -- the best person to debug and to see how to address this issue is the owner of the device. Since you have the Plustek on hand, I advise you to go through the code and see what works, suggest code changes, and see if what is suggested can be more generalized for all scanners.