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5.1.14.3 G : Gain Memory
Gain control allows light response equalization for each CCD photosite in the scanner. This is
required because the amount of light transmitted through the lens is greatest in the center and
tapers off towards the edges. Also, the response of individual photosites varies somewhat due
to limitations in the manufacturing process. Each byte in the Gain Memory holds a corrective
value for a corresponding photosite.
If you enter <D> and a <CR> for “Display”, the contents of the Gain Memory will displayed
starting from address 0000. This memory contains 64K 8-bit words. They are displayed 320
at a time. To view the next 320, press <D> and <CR> again. To view the memory starting at
an address other than 0000, enter D command followed immediately by the address. You do
not need a <CR>, for example, “D2000”.
If you choose <F> for “Fill”, enter, separated by commas, the starting and ending memory
locations, and the two-bit hexadecimal value you want to fill the memory. It will write over
any values that are already there. You do not need to enter a <CR>. For
example,“1000,2000,03”
Choice <M> runs a memory test. If no errors are found , the test indicates “OK”.Otherwise
the test indicates “ERROR” and displays the addresses of the bad memory locations.
If you press <Z> to “Clear the Whole Memory”, the entire memory will be filled with zeroes.
If you enter <CTRL+E> the flash memory containing the gain values is erased. All memory
locations are set to FF .
5.1.14.4 NG : Normalize Gain
If you enter “NG” for “Normalize Gain”, the prompt “Target Pixel Value [E0]:” will appear.
Enter “E0”and press <CR> or just press <CR>.
Next , the prompt “Clear Gain Memory [Y]” will appear. If you do not clear the memory, it
will use whatever is there for the basis of the new normalization. Scangraphics recommends
that you clear the memory before normalization.
The scanner then does a normalization pixel-by-pixel, calculating the gain values required to
bring each pixel to the target.Upon completion, it beeps three times, and returns to Camera
System Diagnostics Menu.