- EPSON Reference Manual Scanner GT-1000, GT-4000, GT-6000, GT-6500, GT-8000, GT-8500, GT-9000, GT-5000, GT-300, ES-300C, ES-600C, ES-800C, ES-1000C, ES-1200C, Action Scanner II, ES-300GS

Image Processing Commands
Image processing commands are used to modify scanned data before
sending it to the computer. Two commands are available: halftone
processing and color correction.
1. Set halftoning mode (ESC B)
This command enables or disables halftone processing for
bi-level data and quad-level data. The type of processing
performed is outlined below. However, the type of processing
available differs by scanner model. See Appendix B for details.
This command also enables or disables Text Enhancement
Technology. This function is only available for B5 or A5
command level scanners or higher.
❏ No data processing
Unprocessed data is sent directly to the computer. Use this setting
when scanning characters or line art that needs no processing.
❏ Halftoning mode A
Produces hard tones using the Error Diffusion method, producing
images with higher contrast. This is appropriate for most images.
❏ Halftoning mode B
Produces soft tones using the Error Diffusion method. This
method produces a softer image than halftoning
mode A.
❏ Halftoning mode C
Produces an image using a screen, again using the Error Diffusion
method.
❏ Dither mode A
Processes data using a 4×4 bayer pattern
Command Usage 2-13