2021-12-01 07:13:34 +00:00
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# Dithering with OpenCL
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2022-01-18 02:51:53 +00:00
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## Note about Maintenance and Versions
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2022-02-18 06:24:31 +00:00
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~~The project at tag `1.0.0` refers to the state of the project upon completion
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2022-01-18 02:51:53 +00:00
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of the course. Newer versions are meant to be maintenance releases; fixes that
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keep the project working. As of 2022-01-18, there may be (after now) a version
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`1.1.0` or `1.0.1` due to keeping up to date with the FFmpeg dependency as a new
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2022-02-18 06:25:53 +00:00
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major version of FFmpeg was released (version `5.0`).~~
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2022-01-18 02:51:53 +00:00
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2022-02-18 06:25:53 +00:00
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~~To be clear, version `1.0.0` of this project is expected to work with FFmpeg
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2022-02-18 06:24:31 +00:00
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version `4.4`.~~
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Fixes were applied for FFmpeg version 5. A macro is used to change incompatible
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code based on what version of FFmpeg is specified in the headers, so external
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checking of version is not necessary. Thus, the latest version of this repo
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should work with both FFmpeg 5.0 and 4.4.
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2022-01-18 02:54:37 +00:00
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2021-12-01 07:13:34 +00:00
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## Background
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[Project Proposal PDF](https://seodisparate.com/static/uploads/EN605.617.81.FA21_ProjectProposal.pdf)
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The proposal mentioned dithering live-input frames, but I ended up with just
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dithering single images or turning a video into dithered images.
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2021-12-01 08:33:28 +00:00
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# Usage
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A "blue-noise" image is integral to dithering images. A generated blue-noise
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image is provided in the "res/" directory. Run the program with "--help" to get
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info on how to use it.
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2021-12-10 06:49:14 +00:00
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Blue-noise images were generated using [my other project that generates
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blue-noise with/without OpenCL](https://git.seodisparate.com/stephenseo/blue_noise_generation).
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2021-12-01 08:36:46 +00:00
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PNG, PGM, and PPM image formats are supported.
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For decoding video, any format that ffmpeg can read should work (though if
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things don't work, try using MP4 files).
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2021-12-03 11:15:02 +00:00
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~~WARNING: Video decoding is still a WIP. The video is currently decoded, but an
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2021-12-01 08:41:49 +00:00
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output video being encoded hasn't been implemented yet. The current
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2021-12-03 11:15:02 +00:00
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implementation writes each video frame to a PNG image in the current
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directory.~~
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2021-12-05 11:15:10 +00:00
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Video decoding and encoding is finished, ~~but there is some noticable drops in
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quality when encoding to colored dithered video~~ but the resulting video may
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end up being too large. It may be better to just output each frame to individual
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PNGs, then combining them later just like as mentioned here with the params you
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want set: https://trac.ffmpeg.org/wiki/Slideshow .
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2021-12-01 08:41:49 +00:00
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2021-12-01 07:16:33 +00:00
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# Other Notes
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2021-12-01 07:50:11 +00:00
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~~I plan on adding the MIT License to this project once the course (that this
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project was made for) is over.~~
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I went ahead and applied the MIT License earlier than noted here.
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2021-12-01 07:51:28 +00:00
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2021-12-04 11:09:55 +00:00
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## C++ Compatability
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The source is written to work with C++11 but not any higher. The only
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significant part that this affects are the functions in the "Image" class that
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return an optional value (non-optional on success). Ideally, C++17's
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std::optional would be used in that case, but since I am keeping things to work
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up to C++11, std::unique\_ptr is used instead.
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2021-12-12 06:53:36 +00:00
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# Project Presentation
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[Click here to view the presentation](https://igpup.seodisparate.com/posts/project_presentation/)
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2021-12-01 07:51:28 +00:00
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# Legal Stuff
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[This program uses FFmpeg which is licensed under the LGPL 2.1 license](https://ffmpeg.org/legal.html)
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2021-12-12 07:15:51 +00:00
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[This program uses libpng which is licensed under the PNG Reference Library License Version 2](http://www.libpng.org/pub/png/src/libpng-LICENSE.txt)
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