Kodak Ngenuity 9090DB Programming Manual page 98

Ngenuity TWAIN Data Source
5 IMPLEMENTATION NOTES
5.1 C
IMAGE ONTRAST
BBH recommends the following user controls implementation
RGB or GRAY Scanning (Color or Grayscale):
Image Brightness
Image Contrast
Image Gamma
BW (Bitonal) Scanning
Image Brightness
Image Contrast
Image Gamma
The following Camera parameters are set by the scanner manufacturer and are not considered to be
user set parameters and should not be exposed to a scanner user (unless for the most advanced
factory users):
BBH_CAP_CAM_BRIGHTNESS
BBH_CAP_CAM_CONTRAST
Therefore the TDS user is required to keep the default settings to FALSE for
BBH_CAP_CAM_BRIGHTNESS_ENABLE
BBH_CAP_CAM_CONTRAST_ENABLE
BBH recommend the use of BBH_CAP_CAM_GAMMA for camera gamma control as this
parameter works within the camera full depth of color palette (maximum bit depth) compared the
the ICAP_GAMMA that controls gamma in the Image Processing buffer RGB 24-bit more limited
color palette.
5.2 C I
OLOR MAGE IN
TWFF_BMP file type with ICAP_PIXELTYPE = RGB creates uncompressed file however the
scanner hardware actually uses JPEG compression with JPEGQUALITY = 99 and
JPEG_SUBSAMPLING = 444 for RESOLUTION at 400 DPI or less and 422 for RESOLUTION
higher than 400 DPI.
5.3 M M
ULTISTREAM
In Multistream mode, the scanner outputs multiple images per pages with up to 4 images for the
Front Page and 4 images for the Back Page. The multistream mode is quite versatile but also contains
some limitations explained below.
Duplex
Front and Back Main Pages are required to have same Orientation, Page Size, Resolution, JPEG
•
Compression and Color Mode. (This is not a multistream mode specific requirement).
Front and Back Sub-Windows settings are independents, except for JPEG compression.
•
Color Mode
Sub-Windows Color mode need to be the same or derived from Main Page Color mode; Black
•
and White (BW) can be derived from Color or Grayscale.
The combination of Color (Main Page) and Grayscale (Sub-windows) is not supported.
•
B
RIGHTNESS GAMMA
ICAP_BRIGHTNESS
ICAP_CONTRAST
BBH_CAP_CAM_GAMMA
ICAP_AUTOBRIGHT (defaultl to Auto-Brightness feature)
ICAP_CONTRAST
BBH_CAP_CAM_GAMMA
BMP
MODE
ODE
November 19, 2009
Page 98 of 99