Epson TM-T88V-i

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Chapter 5 ePOS-Print Canvas API
5
brightness property
Brightness correction value. (in firmware Ver.1.2 and later)
Object type
Number
Description
A gamma value in the range 0.1-10.0 is specified for the brightness correction value.
The default value is 1.0.
Example
To set brightness as 2.2:
<script type="text/javascript" src="epos-print-3.x.x.js"></script>
<script type="text/javascript">
<!--
var address = 'http://192.168.192.168/cgi-bin/epos/service.cgi?devid=local_printer';
var canvas = document.getElementById('myCanvas');
var epos = new epson.CanvasPrint(address);
epos.brightness = 2.2;
epos.print(canvas);
//-->
</script>