Color space compression

An image capture device comprising:

• a camera assembly;
• a processor;
• and
• one or more memories configured to store:
• images captured by the camera assembly, each image including a plurality of pixels, each pixel having a first color value, a second color value, and a third color value,
• compressed images, and
• instructions that, when executed by the processor, cause the image capture device to perform operations on an image of the images captured by the camera assembly, the operations including:
• calculating, for each pixel in the image, a sum of the first color value and the second color value;
• subsampling, among the plurality of pixels for the image, a difference between the first color value and the second color value;
• subsampling, among the plurality of pixels for the image, the third color value;
• and
• storing the sums, the subsampled differences, and the subsampled third color values as a compressed image in the memory.

A method of converting a block of pixels from an image encoded using an RGB color space to a YHB color space, the method comprising:

• (a) calculating an intensity value for each pixel in the block by summing a green component and a red component for the pixel;
• (b) for a first subsample of pixels in the block of pixels, calculating a hue value by determining a difference between the green component and the red component;
• (c) for a second subsample of pixels in the block pixels, using a blue component for the pixel as a blue value;
• and
• (d) storing the intensity values, the hue value for the first subsample of pixels, and the blue value for the second subsample of pixels for the block of pixels.