Float textures' data is a floating point value that signifies a grayscale value, where 0.00 is darkest and 1.00 is lightest. Ifyou use a color RGB texture, then OctaneRender® converts the image to grayscale.
Figure 1: The Float Image Texture parameters
There are some parameters where full color data is not used (or useful). If you load a full-color image, it takes much more memory in the GPUThe GPU is responsible for displaying graphical elements on a computer display. The GPU plays a key role in the Octane rendering process as the CUDA cores are utilized during the rendering process. than a grayscale image, even you want just the grayscale data. Since memory management is very critical for GPU rendering, the Float Image type loads a full-color texture, but it interprets the image as a grayscale image and uses less VRAM. If you need the full-color data, then use the Image data type (Normal maps, DiffuseAmount of diffusion, or the reflection of light photons at different angles from an uneven or granular surface. Used for dull, non-reflecting materials or mesh emitters. maps).