2008

NOTE To control whether or not the renderer uses the environment map's alpha
channel in creating the alpha for the rendered image, choose Customize >
Preferences > Rendering, and then turn on Use Environment Alpha in the
Background Antialiasing group.
If Use Environment Alpha is turned off (the default) the background receives
an alpha of 0 (completely transparent). If Use Environment Alpha is turned
on, the alpha of the resulting image is a combination of the scene and
background image's alpha. Also, when writing TGA files with Pre-Multiplied
Alpha set to off, turning on Use Environment Alpha prevents incorrect results.
Note that only background images with alpha channels or black backgrounds
are supported when compositing in other programs such as Photoshop.
TIFF Files
TIFF (Tagged Image File Format) is a multiplatform
bitmap on page 7730 format
originating on the Macintosh
®
and in desktop-publishing applications. TIFF
is a common choice if you plan to send your output to a print service bureau
or import the image into a page-layout program.
There are several classes of TIFF files, each varying in the color depth and color
palette that they support.
You can render TIFF files with alpha,
luminance on page 7833 , and UV color
coordinate information, which describes
illuminance on page 7813 . You also
have the option to render a compressed image. Luminance and illuminance
data are rendered by the Lighting Data Exporter utility on page 6559 .
Interface
To open the TIF Image Control dialog, click Save or Setup on the
Render
Output File dialog
on page 5892 .
7164 | Chapter 21 Managing Scenes and Projects