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What 3D LUT formats does the Prisma support?
The Prisma supports two different formats for 3D LUTs - the .3dl format and an internal binary
format. The 3dl format is stored in 12-bit precision and the pre-LUT is assumed to be a linear
identity. The internal binary representation is a compact format that can be used to save storage
space and provide faster load times.
How many LUTs can I store on the Prisma?
The Prisma has 1 megabyte of internal storage for data storage. A typical 17x17x17 .3dl is about
67kbytes, so the Prisma could store about 15 of these tables. The internal binary format is about
20kbytes, so there is room for about 50 of these tables.
How can I store a LUT in the binary format?
The easiest way is to load the .3dl table to the Prisma and then save it to a binary version, then
delete the .3dl. We are currently developing software that is able to read a .3dl and create the
binary version.
How does the PrismaVue work?
PrismaVue is an advanced implementation of unsharp masking or USM. Basically, there are two
steps to the process - for each pixel on the screen (frame), the first step calculates a blurred value
from the neighboring pixels. On Prisma, this is done with a 5x5 convolution filter for each Red,
Green, and Blue sub-pixel. The second step takes this blurred value and then subtracts some of it
from the original pixel. The Amount parameter controls how much is subtracted. The Threshold
parameter controls whether the original pixel is output, or if the blurred and subtracted pixel is
output.
Source image (top), sharpened image (middle), highly sharpened image (bottom).
