LUT-Look up Table
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What is a LUT?
A LUT (Look-Up-Table) is simply a table of fixed numerical values that can be applied to video to alter its look. It can change an image’s contrast or color or both. 1D LUTs are the simplest, each input value mapping to a single output value, while 3D LUTs are more sophisticated and can apply to a co-ordinate set of colors.
Benefits of LUTs
A LUT or Look-Up Table makes it easy to apply a wide variety of different looks to your video content. It’s often used when shooting RAW or log content, which may initially look quite flat but contains large amounts of information for post-production creativity.
There are “technical” LUTs that are used to convert between different television standards, perhaps from S-Log3 to Rec-709 as well as creative LUTs that can be used to create an almost endless range of different visual looks and styles.
Lutor: a Web App for Color Grading
I developed a Web App for color grading, which is easy to apply and preview your own LUT on a photo.
The S-Log demo photo was actually taken in HLG profile, so after proper graded it look like this ⬇️:
The Making
This is a very simple process. Just check every pixel in the image to see if there is a corresponding replacement color in the LUT. If there is a corresponding replacement color, replace it. If not, just leave it.
In 2024, the number of pixels of digital photos is usually greater than 10 million. In order to reduce unnecessary calculations and make the UI smoother, I reduced the resolution of the preview image to achieve faster calculations.
If you choose to download, Lutor will recalculate the full resolution image.
To-do
- To add percentage intensity parameter support for applying LUT.
- Save user’s custom LUT for later quick action.
Thanks to
LUT-Look up Table