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Home: Backdraft Conform

 

Processing Clips with 3D LUTs

Colour Management

Accessing the LUT Editor

 

Pre-processing > Colour Management > 

Applying a LUT on Import or Export

Applying a LUT to a film clip on import or export converts the clip's images according to the contents of the LUT.

A typical workflow when using 1D LUTs would be to apply the 10logto12 import LUT provided, converting 10-bit logarithmic image data to 12-bit linear image data. After working with the images in Backdraft Conform, you would then export the clip using the inverse of the LUT, 12to10log. This restores its logarithmic values, in preparation for film printing.

Sample 1D LUTs have been provided that cover the most common conversion processes, and use standard data for Cineon digital negatives (normal exposure). If these LUTs do not give the desired results, you can use them to create a custom LUT. Often, a minor adjustment is all that is required. See Creating Custom 1D LUTs.

To apply a LUT on image import or export from the EditDesk:

1. Open the clip library in which you want to store the images you are importing, or from which you want to export images.
2. Click Import Image, or select an image and click Export Image.
3. In the LUT Type box, select an option.

   
   

   Select:	To:
   Gamma	Apply gamma correction to a clip. This option only appears when a QuickTime movie is selected. See Importing and Soft-Importing Video Files.
   1D LUT	Apply a 1D LUT to a clip.
   3D LUT	Apply a 3D LUT to a clip.

4. If the LUT field is inactive, click the LED indicator to enable it.

   
   

5. Click the LUT field.

   The file browser appears. The Files list contains the LUTs currently residing in your project's ~/lut directory. These include the samples provided with Backdraft Conform, as well as any LUTs you may have saved or exported to this directory. By default, Lustre Color Management LUTs are stored in the /usr/discreet/Lustre_Color/lut/Lustre_Color_3DLUTs directory.

   Sample 1D LUTs include the following.

   LUT File Name	Conversion Process
   10logto12	Converts a 10-bit logarithmic image to a 12-bit linear image.
   10logto8	Converts a 10-bit logarithmic image to an 8-bit linear image.
   8to10log	Converts an 8-bit linear image to a 10-bit logarithmic image.
   12to10log	Converts a 12-bit linear image to a 10-bit logarithmic image.
   invertRGB	Inverts the RGB values of the image.

6. If you want to switch to a different LUT type without exiting the file browser, use the LUT Type box.

   
   

7. Select a LUT in the Files list or navigate to the file you want to use.

   The Import Image or Export Image menu reappears. The LUT field displays the name of the new LUT. It will be applied to the clip you import or export when the LUT is enabled.