Re: Making all colors in an image lighter by a certain percentage

>The most direct way I think would be
>
>convert image -evaluate multiply XX% resultimage


Correction. When using -evaluate multiply XX, the XX is a fraction 
such as 0.8 and not 80%. However, as I said later, if you don't want 
to affect the slope (contrast), then you want

convert  image -evaluate subtract XX% resultimage

Here you do want percent, such as 20%.

Fred