2008

Exposure group
Black Point When this option is turned on, you can set the luminance value
that you would like to be treated as the darkest color, or “black”. The value
can be set as a logarithm (Log) or as a linear value (Linear). All values below
this value will be clamped to black. When this option is turned off, the lowest
possible value is used as the Black Point.
Measured Min/Max Displays the actual minimum and maximum luminance
values in the image, expressed as both the logarithmic and linear values. Using
these values for the Black Point and White Point will result in the image's full
luminance range being used. However, the histogram might show that the
majority of the luminance levels fall into a much smaller range.
White Point Sets the luminance value that you would like to be considered
the brightest color, or “white”, either as a logarithm (Log) or linear value
(Linear). All luminance values in the image that are above this value will be
clamped to white. White pixel values inside HDR files can be much larger
than a Linear value of 1.
The image's extended luminance range is used only when the White Point's
Linear value is set above 1.0. In other words, setting White Point at or below
a Linear value of 1.0 will not use any of the HDR image's special luminance
properties, and will give results similar to other bitmap formats such as TIF
and JPG.
Log Sets the Black Point or White Point as a logarithmic value ranging from
–128 to 127. Changing this value changes the Linear parameter to the
corresponding value.
Linear Sets the Black Point or White Point as a linear value ranging from 0
to over 1 trillion. Changing this value changes the Log parameter to the
corresponding value.
Preview window Displays the selected HDR image.
Internal Storage group
Real Pixels (32 bpp) Compresses the luminance selections into a color space
with 32 bits per pixel. Premultiplied Alpha and Motion Blur do not work with
this option.
Def Exposure When on, the image will load as is without applying any
changes to the colors. When off, you can use the parameters in the Exposure
group to remap colors. Available only with the Real Pixels option.
HDRI Files | 7129