A notable resource on the topic of ordered dithering using arbitrary palettes is Joel Yliluoma’s Arbitrary-Palette Positional Dithering Algorithm. One key difference of Yliluoma’s approach is in the use of error metrics beyond the minimisation of . Yliluoma notes that the perceptual or psychovisual quality of the dither must be taken into account in addition to its mathematical accuracy. This is determined by use of some cost function which considers the relationship between a set of candidate colours. The number of candidates, the particular cost function, and the thoroughness of the selection process itself give rise to a number of possible implementations, each offering varying degrees of quality and time complexity.
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For an instant camera, image quality is also better than most of the other cameras I tested, producing relatively true-to-life photos. Most struggle to capture low-light conditions well, and this one is no exception, but the built-in flash helps. Fujifilm claims the Mini 12 optimizes image quality in both bright and dark environments better than its predecessor, but I didn’t notice much of a difference. The flash — which you can’t disable — is also still overpowering in some instances, resulting in a few overexposed images. Photos actually seemed a little darker and less vivid than before, but selfies captured my features and skin tone more accurately, thanks in part to the small front-facing mirror. The updated lens design also lets you twist into Close-Up Mode to zoom slightly and activate the Parallax Correction features for a more aligned photo. It’s a fun, point-and-shoot-style feature, though aligning photos still takes some practice (as well as some composition guidance from the manual).