Archived Data Techniques Forums

Calling:

ScanLowAcquirePages( hJob, -1, TWAIN_PALETTE, TWAIN_USEADF | TWAIN_SHOWUI, NULL );

Returns a log showing that the image was scanned at 24bit.  This causes GIF to fail in color mode.

 Log:

=====================================================
== Last Modified on 10/24/05 4:00 by EJW           ==
== Extra handle and pointer checks                 ==
=====================================================
Log Opened:
State: 2 Twain Triplet: DG_CONTROL,  DAT_PARENT,  MSG_OPENDSM-  Parent Data window handle: 114487580 [TWRC_SUCCESS]
State: 3 Twain Triplet: DG_CONTROL,  DAT_IDENTITY,  MSG_OPENDS- 
Id: 95
Protocol: 1.9
Manufacturer: Visioneer Inc
Product Family: OneTouch Scanner {9650}
Product Name: Visioneer 9650
Version: 4.0
Language: 13
Country: 1
Info: OneTouch 4.0
 [TWRC_SUCCESS]
State: 4 Twain Triplet: DG_CONTROL,  DAT_CAPABILITY,  MSG_SET-  CAP_XFERCOUNT TWON_ONEVALUE -  TWTY_INT16  255  [TWRC_SUCCESS]
State: 4 Twain Triplet: DG_CONTROL,  DAT_CAPABILITY,  MSG_SET-  ICAP_XFERMECH TWON_ONEVALUE -  TWTY_UINT16  0  [TWRC_SUCCESS]
State: 4 Twain Triplet: DG_CONTROL,  DAT_CAPABILITY,  MSG_SET-  ICAP_UNITS TWON_ONEVALUE -  TWTY_UINT16  0  [TWRC_SUCCESS]
State: 4 Twain Triplet: DG_CONTROL,  DAT_CAPABILITY,  MSG_SET-  ICAP_BRIGHTNESS TWON_ONEVALUE -  TWTY_FIX32  0.0  [TWRC_SUCCESS]
State: 4 Twain Triplet: DG_CONTROL,  DAT_CAPABILITY,  MSG_SET-  ICAP_CONTRAST TWON_ONEVALUE -  TWTY_FIX32  0.0  [TWRC_SUCCESS]
State: 4 Twain Triplet: DG_CONTROL,  DAT_CAPABILITY,  MSG_SET-  CAP_FEEDERENABLED TWON_ONEVALUE -  TWTY_BOOL  TRUE  [TWRC_SUCCESS]
State: 4 Twain Triplet: DG_CONTROL,  DAT_CAPABILITY,  MSG_SET-  CAP_AUTOFEED TWON_ONEVALUE -  TWTY_BOOL  TRUE  [TWRC_SUCCESS]
State: 4 Twain Triplet: DG_CONTROL,  DAT_CAPABILITY,  MSG_SET-  CAP_DUPLEXENABLED TWON_ONEVALUE -  TWTY_BOOL  FALSE  [TWRC_SUCCESS]
State: 4 Twain Triplet: DG_CONTROL,  DAT_CAPABILITY,  MSG_SET-  ICAP_PIXELTYPE TWON_ONEVALUE -  TWTY_UINT16  3  [TWRC_FAILURE]
State: 4 Twain Triplet: DG_CONTROL,  DAT_STATUS,  MSG_GET-  Condition Code: TWCC_BADVALUE- Data parameter out of range  [TWRC_SUCCESS]
State: 4 Twain Triplet: DG_CONTROL,  DAT_CAPABILITY,  MSG_SET-  ICAP_PIXELTYPE TWON_ONEVALUE -  TWTY_UINT16  2  [TWRC_SUCCESS]
State: 4 Twain Triplet: DG_CONTROL,  DAT_USERINTERFACE,  MSG_ENABLEDS-   UserInterface ShowUI: TRUE, hParent:593662
 [TWRC_SUCCESS]
********.**********************.....***************************.*......****...*****....***....*.........***********..*.****.*******...*..****.*****.**.*...........****.*****...**.....*.........****.*****..**..*...************...*****..********..*********..***..***********...*..***********.*.****.********...*********.***.*********.**.***...*.*****........................***********.**********.****.***********.**.***********.*****.********.*********.***.***********.*..***********...*.............****.......*****...**.....*...*********.**...*....*********.**........**.........****.....*****.**...*.........****..*****....**..*...****.*******.....***..*...************...*****.***..*********.***.*..***********.************************************************************************************..***.***********.*****.********.**********.***.***********.*.************.*****.********.*********.***.***********.*.***********...*****.********.***********.*.************.*****.********.*********.****.***********.*.***********.*****.********.*********.***...*.*.***********..**.***..********..**********..***..***********.*.***********.******.********.*********.....**....*.........****.*.****..**...*.....***********...*****.....*****.**..*....*******.********************.**.*******.********.***********.***.****************.*****.************.*.**************.*****.*.*.....********.****.*****.***.....****.*.****.**........*...************.*********.***...****.*****..**....*..........****..*****..**......*......****....*****..***....*.....*********..***..***********...*..****.*******...*...*.***...*****..**....*..........****..*****....**....*.......****..*****.**....*****.*******.*.*********.**.*......****..*****..**.....**.....****..*****..**....*.....****.*******.*..*********.**.*.....****....*****..**......*.......****.*****..**...*...*********..**.*...***********..*..****.*******.*...****...*****...**...*.........*..****.*******..*..****.*******..*..****.*****.**.*..****.*****.**.*...*********.**.*.****.*******.*..****.**.*****.**.*.****.*******.*..*********.**.*.*****..********.*.***************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************.*****...***.......*......****..*****.**..*****..*****....**...*........*********....**...*..***********..*....****..*****.**...*.....****.*****.***.*********.**.*.***********.*.***********.******.********************************************************************************.******************************************************************************************************************.********************************************************************************************************************.**************************************************************************************************************.*****************************************.******...*******************..
State: 5 Twain Triplet: DG_CONTROL,  DAT_EVENT,  MSG_PROCESSEVENT- MSG: MSG_XFERREADY  [TWRC_DSEVENT]
Getting ready to access BITMAPINFO HANDLE \ Succesfully accessed BITMAPINFO HANDLE.
State: 6 Twain Triplet: DG_IMAGE,  DAT_IMAGENATIVEXFER,  MSG_GET- 
BITMAPINFOHEADER:
Size: 40
Width: 1700
Height: 2200
Planes: 1
BitCount: 24
Compression: 0
SizeImage: 11220000
XPels: 7875
YPels: 7875
ClrUsed: 0
ClrImportant: 0
 [TWRC_XFERDONE]

Hi,

The GIF format doesnt support 24 bit image data, you'll need to reduce the bitdepth to 8 bits prior to saving the image as a GIF file.
 

Sean,

I understand that.  But isn't that the point of TWAIN_PALETTE ?  The documentation indicates that it specifies 4 or 8 bit color.  Since that is the only option I am using, why is the data returning in 24 bit?

 Todd

Hi,

 The scanner can ignore that flag so you really need to look at the returned bitmap and based on that call ReduceColors if needed.