Amazon.com, Inc.
Linear light scaling service for non-linear light pixel values

Abstract:

Techniques for a fast approximation of linear light scaling for inputs of non-linear light values are described. As one example, a computer-implemented method includes receiving a request to downscale a plurality of pixels of a single frame of a video file performing, in response to the request to downscale, a lookup in a lookup table for a first input of a first non-linear light value of luminance for a first pixel of the plurality of pixels and a second input of a second non-linear light value of luminance for a second pixel of the plurality of pixels to generate an output of a third single non-linear light value of luminance for a linear light scaling for the first pixel and the second pixel, generating a scaled frame based at least in part on the third single non-linear light value of luminance for the linear light scaling, receiving a request for a manifest for the video file from a client device, generating the manifest for the client device that identifies a scaled video representation that comprises the scaled frame, and sending the manifest to the client device.