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authorJörg Frings-Fürst <debian@jff-webhosting.net>2014-10-06 14:00:40 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2014-10-06 14:00:40 +0200
commit6e9c41a892ed0e0da326e0278b3221ce3f5713b8 (patch)
tree2e301d871bbeeb44aa57ff9cc070fcf3be484487 /doc/sceptre
Initial import of sane-backends version 1.0.24-1.2
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+Scanner overview
+- One pass scanner
+- 10 DPI minimum. Max X=600 dpi, max Y=1200 dpi.
+- A4 size
+
+/*--------------------------------------------------------------------------*/
+
+Components:
+- Weltrend WT8616
+- TEMIC TSC 80C31 (CMOS 0 to 44 MHz Single-Chip 8 Bit Microcontroller)
+
+/*--------------------------------------------------------------------------*/
+
+SCSI overview
+- the SCSI implementation in this scanner is non-standard but simple.
+- there is no REQUEST SENSE command.
+- since there is no sense, it is impossible to know if a command has succeeded.
+
+/*--------------------------------------------------------------------------*/
+
+SCSI commands:
+
+TEST UNIT READY
+00 00 00 00 01 00
+ Returns 1 byte of data:
+ 00 = scanner ready
+ ff = scanner not ready
+
+Vendor Spec
+02 00 00 00 04 00
+ Get 4 bytes of status. Used to check the button.
+ Default result when the button is not pressed
+ 06 00 00 00
+
+INQUIRY
+ result:
+ 06 00 02 02 30 00 00 10 4b 49 4e 50 4f 20 20 20 ....0...KINPO
+ 56 69 76 69 64 73 63 61 6e 20 53 31 32 30 20 20 Vividscan S120
+ 53 31 33 20 20 20 20 20 02 01 00 00 4a 45 46 46 S13 ....JEFF
+ ...
+
+MODE SEL
+15 10 00 00 18 00
+
+SCAN
+1B 00 00 00 00 00
+
+RECEIVE DIAG
+1C 00 00 00 03 00
+
+SEND DIAG
+1D 00 80 00 00 00
+
+SET WINDOW
+24 00 00 00 00 00 00 00 52 00
+ The window size is always 0x52 bytes. The parameters look standard:
+ - X/Y resolution |
+ - Upper left X,Y |- all three coded in 600 dpi units
+ - Width, Length |
+
+ The supported scan modes are:
+ - lineart image comp=0, halftone=0, depth=1
+ - halftone image comp=0, haltone=1 to 4, depth=1
+ - grayscale image comp=2, halftone=0, depth=8
+ - color image comp=5, halftone=0, depth=24
+
+ Y resolution is not used (X is also used for Y)
+ X resolution is limited to 600 (if above, scanner defaults to 600)
+ Y resolution is limited to 1200 (if above, scanner defaults to 1200)
+ Image composition is byte 33, halftone is byte 36, depth is byte 34
+
+READ (10)
+28 00 00 00 00 00 00 FE 9A 00
+
+SEND (10)
+2A 00 03 00 00 02 00 03 00 00
+Sends 300h bytes of gamma. 100h bytes per color. What is the color order?
+
+GET DATA BUFFER STATUS
+34 01 00 00 00 00 00 00 10 00
+Returns:
+ - byte 0 to 7: ? (these bytes looks rather standard)
+ - byte 8 to 11: total size left to read
+ - byte 12 to 13: number of lines (constant during a scan)
+ - byte 14 to 15: pixels per line (constant during a scan)
+
+/*--------------------------------------------------------------------------*/
+
+Color shifts
+
+Color order returned by the scanner is Red, then Green, then Blue. There is a color shift, meaning the raster for the Red is not followed by the Green raster for the same line.
+The shifts are:
+ dpi lines per color
+ 1200 16
+ 1125 15
+ 1050 14
+ 900 12
+ 750 10
+ 600 8
+ 450 6
+ 300 4
+ 150 2
+ 90 1
+ 75 1
+ 50 0
+
+Some resolution give garbage. However that table might not be complete.
+
+