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HDR Light Studio - Documentation

An image is loaded as the content for this type.

image_content_type_20180919

Image
To load a new picture or change an existing one, click on the Folder icon button and select an image file, or drag the file from a file browser and drop it into this field.
The following is a list of supported image file formats: BMP, DDS, DPX, FITS, HDR, ICO, IFF, JPEG, OpenEXR, PNG, RLA, SGI, TIFF.

If the image being loaded is 1,500 pixels wide or larger,  you will be prompted to convert the image into a TX file. For more information about Converting to TX files, see Working with Images.

Resolution
Displays the pixel resolution of the loaded image

Aspect Ratio
To adjust the height of the light to match the loaded image's aspect ratio, press the Restore button.

Color Profile
Set this to tell HDR Light Studio what color profile has been embedded into the values in this image. The selected profile is reverse applied to the image, to return the image to linear color space.
For example, most LDR images will have color a profile sRGB already applied. So select sRGB in this drop down to make the image linear.
Most HDR images should already be in linear color space, so choosing linear will not apply any adjustment, as the image is already in linear space.
For more information see: Color Management

Options: Half
Removes the bottom half of the light.

Options: Flip
Horizontal Flip of the image

Options: Unpremultiply
If the loaded image RGB values have already been multiplied by the alpha, this provides a method to un-premultiply them, so we get proper results when using the alpha channel in conjunction with this image. Otherwise we could get white fringing on the image.

Options: Invert Alpha
Inverts the alpha channel in the loaded image.

Color Mode
Choose how to color the image. There are 3 options:

Source - the color of the image comes from the image. A saturation slider allows the intensity of the colors to be adjusted.
Flat - choose a single color to colorize the whole image.
Ramp - use a linear or radial gradient to colorize the image.

Saturation
Adjusts the saturation of the loaded image
saturation_example
Saturation value examples: 0, 0.5, 1 (matches the source, no change), 1.5

Gamma
Adjusts the gamma of the luminance of the loaded image. (put simply its an image contrast control)
 
gamma_example_01
Adjusting the Gamma of the whole HDRI map. Example values: 0.5, 1 (no change), 2.2

gamma_example_02
Adjusting the Gamma of a light source. Example values: 0.5, 1 (no change), 2
See how the gamma adjustment can be used to change the character of the light source. In the example above, a tracing paper light, the fall-off of the light across the paper has been dramatically changed by using the gamma control alone. Gamma is very useful for adjusting the character of image based light sources.
 

 

 

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