The toolbar contains a palette of 44 colors that can be selected to be the current color by
clicking on any of them. By placing the cursor over a palette color a tooltip will appear
giving the exact RGB (Red,Green,Blue) values for that color. The current color is also
complimented by a gradient shade bar which shows colors from the current color to white
on the left and black to the right. Clicking on this shade bar will select a new current color
from the bar (and clicking again on the current color at the bottom of the grid will restore
the previous color).
The three color squares at the bottom of the grid window show the current color, the background color and a second color. The second color is used for gradient fills and is also the outline color for created shapes that are both filled and outlined (the fill will be the current color in such a case). By clicking on the background or second color squares, the current color is set to be that color. To return back to the original current color from the background or second color, click on the current color square.

To customize the current color to a color not shown in the current palette simply click on the current color button. The "Colors" menu has various options for changing and customizing all three colors as well as the current palette.
which displays
all the unique colors in the image. Clicking on any color in the dialog displayed makes that color the current color. If there
are more than 256 colors in the image then this function only displays the first 256
and indicates that there are more than 256 colors. This is useful when creating GIF images.
Note that when the colors are being counted the background color constitutes one color if it appears in the image
and this is true even when saving as a transparent GIF.

Usually texture images are small but there is no rule for the size. The image selected is then used to fill any shape subsequently drawn by tiling it repeatedly. Select any palette color to drop the texture or click on the color box which shows the current texture above the image grid to go back to the original color. A good way to create images to use as textures is to utilize the "Repeat image section" option in the edit menu.
