I am having an issue with my GIFS. I have strung together two images as an animation in Photoshop, both high quality off the bat (2000 x 3000 px), I know when I compress into a moving GIF it's going to be slightly lower quality, which is fine as the intended output is 300 x 500 px. My issue is with the blockiness of the background. The images are shot on a grey studio backdrop, and whilst the subject is not blocky in any way, the background becomes heavily pixelated and colour is distorted. I know what I'm doing with settings, dithers and colours etc, so my question is:
Is there are better methodology to creating a high quality GIF without the above issue?