[mrtg] How to reverse the color of the graph

[Nelson Serafica]

Could someone advise how to reverse the image? If you will check the attached image, I want pic1.png to be like pic2.png. i want the blue on the pic1.png to be solid. Meaning all blue must be shaded and not just a line. Instead, the green will be the line and blue will be the solid color just like pic2.png

I familiar to this when I use bash script in my mrtg but since this is generated via snmp, I don't know what to put in the config file. When using script, I just put 

LegendI
LegendO
Legend1
Legend2

I put this in my config file but the image doesn't reverse.


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