Color inversion with ffmpeg

Author: alan-null

media/color-inversion.md

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+# Color inversion with ffmpeg
+
+```powershell
+ffmpeg -i input.mp4 -vf "negate,hue=h=180,eq=contrast=1.2:saturation=1.1" output.mp4
+```
+## Demo
+#### Before
+
+<video width="820"  controls>
+  <source src="https://github.com/user-attachments/assets/a6969533-a1f9-4a8f-9203-dd151f4c6aa7" type="video/mp4">
+</video>
+
+<!-- to display video on GitHub Markdown -->
+https://github.com/user-attachments/assets/a6969533-a1f9-4a8f-9203-dd151f4c6aa7
+
+#### After
+
+<video width="820"  controls>
+  <source src="https://github.com/user-attachments/assets/16785da7-4ed3-48c5-ad3e-b1223987c49e" type="video/mp4">
+</video>
+
+<!-- to display video on GitHub Markdown -->
+https://github.com/user-attachments/assets/16785da7-4ed3-48c5-ad3e-b1223987c49e
+
+
+## Explanation
+The `-i input.mp4` part specifies the input file.
+
+The `-vf` flag stands for "video filter," and it is followed by a series of filters applied to the video.
+
+The filters are:
+
+- `negate`: This filter inverts the colors of the video, creating a negative effect.
+- `hue=h=180`: This filter adjusts the hue of the video by 180 degrees, effectively rotating the color wheel to change the overall color tone.
+- `eq=contrast=1.2:saturation=1.1`: This filter adjusts the contrast and saturation of the video. The contrast=1.2 increases the contrast by 20%, making the darks darker and the lights lighter. The saturation=1.1 increases the saturation by 10%, making the colors more vivid.
+
+
+
+Combining these filters results in a video with inverted colors, a shifted hue, and enhanced contrast and saturation. The processed video is then saved as output.mp4.
+
+
+*[source:
+Rubber Duck Thursdays!](https://www.youtube.com/watch?v=o7b6t6uZJPA)*