Intermec Janus 2020 Reference Manual - Im_Increase_Contrast
im_increase_contrast
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im_increase_contrast
Purpose:
This function decreases the LCD display contrast by one level. The display
contrast is the lightness or darkness of the characters against the reader
display. The reader display has 32 levels of contrast (0 to 31), where 0 is
very light, and 31 is very dark.
Syntax:
With Intrmecd_IO, Intrmecp_IO;
Use Intrmecd_IO, Intrmecp_IO;
function im_increase_contrast return System.Word;
Parameters:
None.
Return Value:
This function returns one of the standard status codes listed in Appendix A,
“Status Codes.”
Notes:
The 0 to 31 scale fine-tunes the contrast more precisely than using the
keypad to adjust the contrast.
The functions im_set_contrast and im_get_contrast use a scale of 0 to 7 that
is related to the scale of 0 to 31 used by im_increase_contrast and
im_decrease_contrast. The following table shows the equivalent values for
the 0 to 7 scale.
Scale 0 to 7
Scale 0 to 31
Level
0
10
Very light
1
12
2
14
3
16
4
18
5
20
6
22
7
24
Very dark
This function has no effect on the JANUS 2050.
See Also:
im_get_contrast, im_decrease_contrast, im_set_contrast