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7.2 The TIFF display driver

This display driver lets you write the rendered image into a TIFF file. Compressed TIFFs and cropping are supported. Only RI_RGB, RI_RGBA, RI_A are supported for now. This display driver understands the following parameters.

"string fullimage" ["on"]
When using CropWindow, this parameter enables you to create an image of the original size, with the cropped region placed inside. Areas that are outside the crop window will be set to black (and alpha will be 0). This option is useful when compositing a cropped image with a matching complete image. The default value is `off'.

"string compression" ["lzw"]
"lzw"
LZW compression, default;
"none"
no compression;
"packbits"
run length encoding;
"deflate"
Deflate compression (zip);
"logluv"(24)
LogLuv compression, perfect for high dynamic range images. Expects floating point data as input. A limitation of this compression scheme is that the alpha channel cannot be stored in the same TIFF directory as the image, so it is written separatly in a 2nd directory. The white point is also stored in the TIFF when using this compression.

"string description" "s"
Specifies a description string which will be stored in the TIFF.

"string extratags" ["on"]
By default, this display driver will write some useful informations to the TIFF by using the tagging mechanism(25); however, some tags are not supported by all TIFF software (See table below), this option can turn those tags to `off';

Tag name Description
TIFFTAG_SOFTWARE Will be set to something like "3Delight 0.9.6 (Sep 26 2002) "Fidelio"";
TIFFTAG_IMAGEDESCRIPTION Will be set to a user provided description, if any;
TIFFTAG_XPOSITION x cropping position in pixels, only active when cropping and "fullimage" is "off" (default);
TIFFTAG_YPOSITION y cropping position in pixels, only active when cropping and "fullimage" is "off" (default);
TIFFTAG_WHITEPOINT White point when using LOGLUV compression;
TIFFTAG_PIXAR_IMAGEFULLWIDTH* Set when an image has been cropped out of a larger image; reflects the width of the original uncropped image;
TIFFTAG_PIXAR_IMAGEFULLLENGTH* Set when an image has been cropped out of a larger image; reflects the height of the original uncropped image;
TIFFTAG_PIXAR_TEXTUREFORMAT* Set to "Image"
TIFFTAG_PIXAR_MATRIX_WORLDTOSCREEN* World to Normalized Device Coordinates transformation matrix;
TIFFTAG_PIXAR_MATRIX_WORLDTOCAMERA* Wrold to Camera transformation matrix.

Supported Tags. Those marked with an '*' can be disabled using `extratags' option


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This document was generated by Aghiles Kheffache on July, 31 2003 using texi2html
3Delight 1.0.0. Copyright 2000-2003 The 3Delight Team. All Rights Reserved.