Bucket Fill:

The bucket fill tool is used to color an object with the selected foreground (1) or background color (2).
To set the foreground color to fill an object, click the mouse pointer in the selected object.
To fill an object with the background color and press the Ctrl key on your keyboard while you click or select the option “FG-color fill” in the options window.
If you want the object to be filled with a pattern, select this option in the options window (A), and click the object.
All options in this window seem clear to me.

To change the foreground or background color, double-click in the toolbox, and in the dialog that appears (3), change the color.
In this dialog we have five different tabs (A), each with their own color picker.
I cannot go through all of them but they all seem clear. The only thing I can say is, when you’ve found a color that you will want to use later, click the button with the arrow pointing to the right (C).
This adds the color to the color preset list (D).

 

Blend

We use the “Blend” tool (1) to fill a layer, or a selected portion of a layer of color in a gradient of two or more colors.
When the “Blend” tool is selected, we find a number of options below the toolbox.
At the top we have the “Mode” checkbox. This is used to determine the gradient between the selected layer and the underlying layers. But more on that later.
Under the mode checkbox we have the “Opacity” option. With this we define the transparency of the colored area.
Below that we have the “Gradient” option (A). When we click it, a menu opens, with several standard supplied gradients.
The same list of gradients are also represented on the right side of the document (s), under the window “Gradients”.

Under the “Gradient” we have the slider, “Offset”.
With this you determine the contrast level of the transition between the two colors. The higher the number the higher the contrast level of the transition between the two colors.

Then we have the “Shape” checkbox.
With this, we determine the shape of the gradient. You should try all this.

Below this we have the “Repeat” option. When this is selected, the sequence can be repeated. How many times it is repeated depends on the length of the wave created by moving your cursor.
It is best that you try all these options once, so that you can see the immediate impact.

What I can say is that when you click and drag with the “Gradient” tool, the color that you’re starting with is the set foreground color (4) and the color that you’re ending with is the background color (5).

 

Add / Change Gradient (1)

To add or change a gradient you need to open the  “Gradients” dialog.

The first four gradients that exist by default in the list, are all related to the foreground and background color set in the toolbox (A).
So, you can change them, or they will also run automatically.
Remember, this can be useful, later.

Bottom of the dialog we have five buttons. I’ll explain them:

1. Edit Gradient
2. New gradient
3. Duplicate Gradient
4. Delete Gradient
5. Refresh Gradients

The standard gradients present in the list cannot be changed.
This becomes clear when you select one, and click the “Change Gradient” button.

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