The whole series of School Rumble has obvious chroma shift in the source, with some common issues found in DVDs as well. We fixed the chroma shift, and upscaled the picture to 720p. Occasional complex interlaced scenes (especially in some openings and endings) were dealt with custom-written IVTC functions. We also tried our best to fix some heavily aliased scenes and corrupted frames in the source.
In particular:
1. All animated videos were upscaled to 720p using Waifu2x-caffe, with the only exception of the SP vomic in San Gakki where NNEDI3 were used to make the text appears slightly better. Grains were sampled, removed and reapplied after upscaling, and lines were adaptively darkened, in order to recover some of the visual features of the source and reduce the overall "oil painting effect" introduced by neural network-based scalers.
2. The source has some complex interlaced scenes due to bad editing, which cannot be recovered by normal field-matching algorithms. Customized masking and manual field-matching/deinterlacing were used in some of these cases, to avoid introducing additional artifacts and retain the smooth motion (e.g. the ending of S1) as much as possible. Given the imperfect nature of automatic IVTC, we had a dry run for all the encodings, watched them and tried to catch and fix the errors before the release.
3. Chroma shift is prominent across all animated videos. We tried to move the chroma planes back in place to fix this unpleasant artifact.
4. A few cuts in Ichi Gakki Hoshuu and Ni Gakki are heavily aliased. We tried our best to make them not as obvious.
5. There are lots of frames appear as clipped at the bottom by 1-2 pixels in Ni Gakki ep.24 and ep.25, and occasionally in other places. We tried to fill the gap with lines from adjacent frames (if they're supposed to be same) or lines above the gap from the same frame (if no adjacent frames can be used).
6. There are several corrupted frames in Ni Gakki ep.24. We fixed them in Photoshop and replaced the frames back into the video.
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