The Targa (TGA) format
was developed by Truevision for their video boards. The format supports
32-bit true color; that is, 24-bit color plus an alpha channel,
and is typically used as a true color format.
Targa files are widely
used to render still images and to render sequences of still images
to video tape.
Some Targa files created
by other applications have different file-name extensions. 3ds Max can
render the .vda, .icb, and .vst variants
as well as .tga.
Clicking Render or Setup
Output File dialog displays the Targa
Image Control dialog.
When you render to a
Targa file, you have the following options:
Image Attributes group
Choose the color depth: 16-bit,
24-bit, or 32-bit.
Applies lossless compression
to the file.
- Alpha Split
Creates a separate file
for the alpha channel. The file name created for the alpha-channel
file starts with a_ and then appends the full file name. For example,
if you check this box and render the file greek004.tga, 3ds Max creates
the file a_greek004.tga for the alpha channel.
(Sometimes the name will be longer than 8 characters.)
- Pre-Multiplied Alpha
When on, pre-multiplies the
alpha channel. Pre-multiplying saves computation time if you later
use this image in compositing. See
- Author Name, Job Name/ID, Comments
These fields are available for
you to add information about the file.
To control whether
or not the renderer uses the environment map's alpha channel in
creating the alpha for the rendered image, choose Customize
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