三季的原盘有很大的差别,处理方法也完全不同。第一季的质量不错,线条清晰,只有轻微的锯齿,平面上也只有部分场景有一点色带,处理中针对锯齿和色带进行了轻度处理就得到了比较满意的效果。第二季画面灰蒙蒙的,线条也比较模糊,多数场景为原生 720p,在处理中把这些场景先逆向缩回 720p 再用更高质量的算法拉伸到 1080p,较好地解决了锯齿问题,平面上色带要比第一季更强,所以去色带强度要高一些。第三季色彩明亮,线条清晰,观感很好,但有很多粗制滥造产生的奇怪锯齿以及比较明显的色带,处理中进行了较高强度的抗锯齿和常规的去色带,最后适当锐化补偿抗锯齿中的损失,避免和原盘画面差距过大。对比图中前 6 组为第一季,7-12 组为第二季,13-18 组为第三季。
The source of each season is vastly different, and so is our pre-processing methods. S1 has a good quality with clear lines, mild aliasing and slight banding on the surface,so mild anti-aliasing and de-banding are enough to produce a satisfactory result. The image in S2 is greyish, lines look blurry, and most scenes are natively 720p. We firstly descaled the image back to 720p and reconstructed with better algorithms, which solved the aliasing fairly well. Banding on the surface is stronger than that of in S1, so we applied stronger de-banding here. S3 has bright colours and clear lines. It delivers a comfortable visual experience, but there are many weird rough aliasing and noticeable banding. Pre-processing includes high strength anti-aliasing and moderate de-banding. We also compensated the sharpness as a remedy after anti-aliasing, which is to avoid a huge inconsistency in the image with the source. As for the comparisons below, the first 6 pairs are from S1, 7-12 are from S2 and 13-18 are from S3.