Krita
Krita is a 2D Art software that's free and excellent for drawing, animation, and digital painting.
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It can be downloaded for Mac and Windows from here: https://krita.org/en/
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This is a fantastic guide on how to use the Krita animation set up:
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Using Krita for Rotoscoping:
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As Krita is pretty similar to Photoshop, you can follow the Photoshop Rotoscoping Tutorial that can be found at: https://gcsephoto.wixsite.com/website/copy-of-sebi-s-footage-1
to help you create a Rotoscoped Animation.
Unfortunately, unlike Photoshop. you can't import video frames directly into Krita to create a rotoscope with, but you can import still video frames as JPEG's instead.
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So, if you want to rotoscope on a video, you'll need to convert it. This can be done by uploading your video to: https://www.onlineconverter.com/video-to-jpg and downloading all the frames as JPEG's.
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Then in Krita, go to File > Import Animation Frames and select the JPEG files to import them so that you can draw on top of them following
