Most buttons use multiple tools that appear when you click and hold on it.
1.
Pencil. Draw sharp lines with pixel structure.
Water. With this you can paint and blend colours.
Airbrush. A brush with a very soft edge.
Pen. Sharp brush without pixel edges.
EPen. This tool make a blotchy effect
Mosaic. Use this over your drawing and it will turn in something pixellated.
2.
Dodge. Lighten a colour.
Burn. Darken a colour.
Soft. Blur your image.
Text. Type text in your drawing.
3.
Copy. With this you can select a part and copy to another place of the canvas.
4.
Erase. Eraser with hard edge.
Esmooth. Eraser with soft edge.
EraseRect. Erase with a rectangle.
EraseAll. Clear your drawing and start over again.
5.
Color Choose a colour.
Texture. Draw with a texture. You can choose from different patterns.
6.
Freehand. Draw normally.
Line. Draw straight lines.
Bezier. Draw clean curved lines. This takes practise.
SolidRect. Draw filled rectangles.
Rect. Draw rectangles without filling.
SolidOval. Draw filled circles.
Oval. Draw unfilled circles.
Fill. paint bucket.
7.
Normal.Draw normally.
Mask. With this tool you can't draw over the selected colour.
Reverse M. With this tool you can only draw over the selected colour.
8.
Color palette. Click on the right in your drawing to pick a colour. Click on the right in the colour palette to change the colour to the new colour.
9.
Manually edit colours R is red, G green and B voor blue. 0 is very dark en 255 very light. With A you can change transparency. A1 is invisible and A255 is solid. You can use this also for the erasers.
10.
Manually edit brush size. By clicking right you can also edit the brush itself.
11.
Layer. Clicking this, you will get a layersmenu. 0 is the bottom layer.
In the menu you can Add layer, Delete layer, Visible layers combine and use preview (you will see a preview of the layer when rollover the mouse).
You can change transparency on the bar.
Left click on the circle to turn off the layer. Right click to turn off all other layers.
Change layer order by draggin the layer to another place. You can choose to merge the layers or shift them.

On the bottom and right are scrollbars. You can zoom in with
+ and zoom out with
-.
Pressing the
P let you use the pressure sensitivity of your drawing tablet, if you installed Jtablet.