Inks/Opaque
Selects the opaque ink: the current color will be used directly
Inks/Soften
Blurs the image. Calculates the average color from the pixel's colors and the 4 neighbouring color, finds a color from the palette which is closest and uses that color to replace the pixel.
Inks/Unzag
Variation to soften, calculates the new color from only the neighbours. But will be changed in the future. The original goal of this ink is to reduce the step or staircase effect, ie it should do some basic anti-aliasing.
Inks/Glass
Combines the selected color with the current color. Select Ink/Properties... to set the opacity. Higher value means it will be closer to the selected color. Lower value means it will be more transparent.
Inks/Tile
Use a pattern instead of the current color. The pattern is taken from the clipboard. The clipboard's position also matters, so to change the offset of the pattern select Clipboard/Move.
The ink can optionally match the palette, if the clipboard's palette is different from the image palette.
Inks/VGrad
Fills the drawn region with a vertical gradiant. The colors are the ones in the current color set. You can use the various tools in the Color sets menu to select the proper gradient.
Inks/HGrad
Fills the region with horizontal gradiant.
Inks/Add
The current color's index will be added to the pixel's color index.
Inks/Sub
The current color's index will be substracted from the pixel's color index.
Inks/Logical 'or'
Performs the logical OR operation between the pixel's color index and the selected color index. Can be usefull if the palette is well designed.
Inks/Logical 'and'
Performs the logical AND operation between the pixel's color index and the selected color index. Can be usefull if the palette is well designed.
Inks/Logical 'xor'
Performs the logical XOR operation between the pixel's color index and the selected color index. Can be usefull if the palette is well designed.
Inks/Properties...
Shows the currently selected ink's properties if any. See Tools/inks properties window.