Colour Picker

Of course, Photoshop is the garden of many delights but for

day-to-day work, I much appreciate Microsoft Expression Design (Free).

Below, exploring the saturation tool: the opacity rating at 100% means an image

will completely cover the one underneath as one adds layers.

And one adds layers in the progression of[putting something together largely for

sanity reasons. One can change or delete  layers very easily, change their

order, whatever...

Below, both ellipses are at 70%. If I superimpose them, the common space is darker,

but as much as it would be if I had kept the original at 100%

                                     

Here, the same exercise over a blue rectangle. The original is less violet.

The effect can be that of a lighter shade of fuschia over white, but if I really mean
that lighter shade to begin with, I am better to get it from the colour board at 100%.

                                                               *   *   *

As for changing things around, it does require some work. Essentially, changing a bitmap
image to a vector one that allows paths to be drawn on it:

Using the pen tool to define the area to be affected:

Copying the new area:

Pasting it on top of the original:

For creating light effects on the dress - wait for it - a

lower opacity layer with the shade colour one wants!!