Quel scanner choisir parmi ceux 2 sachant ceci :
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ASTRA Umax 1200 S
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Type Color Flatbed  
Method Single-pass, 30-bit color with BET  
Element Color CCD  
Light Source Cold Cathode Lamp  
Hardware Resolution 600 dpi x 1200 dpi  
Maximum Interpolated Resolution 9600 dpi x 9600 dpi  
Maximum Scan Size 8.5" x 14"  
Document Size Legal, Letter, A4, A5, B5, Business Cards  
I/O Buffer 512K  
Scan Modes 30-bit color 10-bit gray scale 1-bit halftone 1-bit line art  
Hardware Interface SCSI-2  
Power Consumption 25 Watts  
Voltage 100-240VAC  
Frequency 50/60Hz  
Dimensions 21.1" x 12.9" x 4.1"  
Net Weight 12.8 lbs.  
System Support Macintosh Windows 3.1 Windows 95 Windows 98 *Windows NT compatibility through the driver  
Transparency Adapter OPTIONAL  
 
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HP Scanjet 4c
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Scanner Type
 Flatbed, color and monochrome
 
Image Processing Options
 Dithering, thresholding, gamma adjustment, mirroring, data inversion, filtering, color correction, scaling, interpolation
 
Scanning Modes
 1-bit (black and white)  
4-bit (16 grayscale levels)  
8-bit (256 grayscale levels)  
10-bit internal (1024 grayscale levels) automatically mapped to optimal 8-bit  
24-bit (16.7 million colors)  
30-bit internal automatically mapped to optimal 24-bit
 
Resolution
 2400 dpi enhanced resolution  
600 dpi optical
 
Selectable Resolution
 12 to 2250 dpi at 100% scaling
 
HP AccuPage Technology
 Automatic page optimization for OCR, document management, and PC fax applications version 2.0 for PC, v 1.0 for Macintosh
 
Scanning Speeds
 Preview: 4 seconds  
200 dpi, grayscale, letter size: 3.3 seconds  
300 dpi, black and white, letter size: 7.5 seconds  
600 dpi, color, letter size: 30 seconds
 
Scaling
 2 to 400% in 1% increments at 600-dpi (depends on resolution)
 
Color  
 24-bit (16.7 million colors) external; 30-bit (1 billion colors) internal
 
Grayscale
 4-bit (16 grayscale levels) external  
8-bit (256 grayscale levels) external  
10-bit (1024 grayscale levels) internal
 
Maximum Document Size
 8.5 by 14 inches (215 x 356 mm)
 
Scanning Element
 Charged-coupled device
 
Light Source
 Single fluorescent lamp
 
Interface
 SCSI-2
 
ADF
 Yes, 50 pages
 
Comment départager ces deux scanners , lequel choisir ?

donnez moi au moins quels sont les paramètres à comparer ?