Autodesk 12812-051462-9011 User Guide 3 - Page 2117

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 7926 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 8029, and UV color coordinate information, which describes illuminance on page 8009. You also have the option to render a compressed image. Luminance and illuminance data are rendered by the Lighting Data Exporter utility on page 6759. Interface To open the TIF Image Control dialog, click Save or Setup on the Render Output File dialog on page 6086. 7372 | Chapter 23 Managing Scenes and Projects