1. A method, comprising: identifying a test image; selecting a selection mode, the selection mode including at least one of a channel match mode, a downsample match mode, and an upsample match mode; automatically selecting, utilizing a processor, a reference image from a set of reference images; validating a graphics processor design using the test image and the selected reference image; and automatically and conditionally adding the test image to the set of reference images, based on a result of the validation using the test image and the selected reference image; wherein if the selection mode includes the channel match mode, then the selected reference image must have same channels, channel data types, and channel data sizes as the test image, such that the selected reference image has a same color channel structure and depth format.