Adding visibility masks to images
If a paint object has a visibility mask, you can erase to a clear back-
ground. Also, Canvas can protect transparent areas when you paint or
edit in the image.
You can add a visibility mask to a paint object that was created with
an opaque background in Canvas or imported from another applica-
tion.
Paint objects can look the same whether they have visibility masks or
not. However, a visibility mask changes the way that the Eraser tool
works and the effect of deleting or moving a selection.
Create options
The Create Image dialog box
has options for new images.
File Size. The amount of
memory required by the paint
object, based on resolution,
size, and image mode. Black
& White mode requires the
least memory; CMYK Color
requires the most.
Mode. Choose an image
mode. See Image modes for
Canvas paint objects on
page 31.621.
Background. Choose Trans-
parent or Opaque.
Opaque creates an image
filled with opaque pixels. You
can select a color from the
adjacent palette. To specify
a custom color, see Creat-
ing custom colors in pop-up
palettes on page 18.320.
Transparent creates a clear
image with a visibility mask.
When you choose this
option, the color palette is
not available.
Width and Height. Type
the paint objects width and
height. In the adjacent
menus, choose pixels and
enter relative dimensions, or
choose a unit of measure-
ment and enter absolute
dimensions.
Res. Enter the image resolu-
tion. Choose pixels per inch
or pixels per centimeter in the
adjacent menu.
Auto. Click Auto to calculate
the resolution based on half-
tone screen frequency.