[scribus] White versus transparent pixels question

[Gregory Pittman]

On 04/25/2016 08:18 AM, Vladimir Savic wrote:
> You are on the right track, but not quite there. Your paper color is the
> whitest white you can get without using real white color. If you change
> white to be a bit darker, you are essentially just adding more pigment on
> background. Even if you choose to print on a black paper, you will again
> just add more pigment on that black, thus making it more darker.
> 
> To get an idea on how it COULD work for you, take any png image and import
> it into Scribus' image frame. Define two custom spot colors: ExampleColor1
> and ExampleColor2 with arbitrary color values. Important is to just mark
> those two as spot colors. Go back to editing object on canvas. Find out how
> to add Image Effects. From there, choose Duotone effect and set it to use
> your custom defined colors.
> 

Another way of thinking about this is that if you are going to be
printing white on colored paper, you will need a quite opaque ink to
make sure it covers the background and looks white. This is one of the
roles of spot colors. Sometimes you want to have a spot color, like
silver, that can't even be represented in the RGB colorspace.

Greg