Invert colors on spectrum mode

[nailo2c]

Hi, thanks for the great work on this plugin. However, the Colors of spectrum mode is more close white when the value is close to max.

Could you add the invert of colors so that I can show the max value by red, it's more intuitive to me.

[yamac-kurtulus]

Try setting min value to 100, rather than max value. It is a possible work around for me, albeit it is a bit ugly. I have tried it for values between 0-1. However, spectrum plugin has a bug (see #124) that I too suffer from, so I cannot really test it properly , and I cannot tell if this is working as intended :(

[nailo2c]

@yamac-kurtulus thanks to your share, I'll try it :)