Layer mask
The layer mask is a function that allows you to mask (hide) an image on a layer.
By using this function, unnecessary parts such as overlapping lines can be hidden, making coloring easier.
 How to create a layer mask
■Create from selection area
Let’s create a layer mask.
The basic workflow is to first create a selection area of the part to display/hide, and then create a layer mask.
①From the layer palette, select the layer to create a layer mask on.
②Use the [Rectangle] tool to create a selection area.
Note: Alternatively, you can select an area using tools other than [rectangle], or go to the [Selection] menu > [Select Color Gamut]. The later steps will be the same.
③From the [Layer] menu, select [Layer Mask]→[Mask Outside Selection] or [Mask Selection].
This will create a layer mask on the selected layer and the image will be partially hidden.
The black area displayed on the thumbnail of the layer mask will be hidden.
■Creating a layer mask without making a selection area
Creating a layer mask without a selection area will mask everything (as shown below), or mask nothing.
[POINT] Creating a Layer Mask from the Layer Palette
Click [Create layer mask] below the layer palette to create a layer mask.
If there is a selection area, the outside of the selection area will be masked. If there is no selection area, nothing will be masked, and a blank layer mask will be created.
 Drawing on the layer mask
After creating the layer mask, you can change the masked part as if drawing.
■Add to the displayed area
Drawing with a color other than transparent color will add to the displayed area (= erase the masked area).
①Click to select the [Layer Mask] thumbnail of the [Layer] palette.
Selecting it will enclose the thumbnails in double lines.
②Select a drawing tool from the [Tool] palette.
Here, the [Pen] tool was selected.
③Select a drawing color other than the transparent color.
④Drawing on the canvas will add to the displayed area.
■Add hidden area
Using the [Eraser] tool or drawing with transparent color adds the masked area.
①Select [Layer Mask] from the [Layer] palette.
②Select [Eraser] tool from the [Tool] palette.
③When using drawing tools such as the [Pen] Tool, select transparent color as the drawing color.
④Drawing on the canvas will add to the hidden area.
■Advanced editing with drawing tools
By using the [Decoration] tool or the [Brush] tool, drawing on the mask can change a mask into unusual shapes or add shades.
■Show/Hide in selected area
By filling in or deleting the selection area, the mask can be changed to fit the shape of the selection area