So why use video? Online video compresses more efficiently, allowing for faster, better playback. If your render fails, you have to start the whole thing over since the computer can't easily tell at what point everything broke down. Video compresses in a more lossy way and you have to render it in one go. You'll find a certain number of frames bundled into each chunk and for some formats, the video is one complete piece. Instead of going image by image, video files break the frames into chunks. A single frame is the same as an image, but the way they're handled is different. Where an image sequence includes a folder that contains a series of images, a video file doesn't. If you take apart a video file, you'll find different pieces to it as you would for a GIF or other type of image sequence. Another great thing about image sequences is that they don't require a codec to play or render. When it comes to rendering, they're more reliable, because should your render fail, you can pick back up on the last image rather than having to start all over again as you would have to if you rendered a video. Second, they're great if you need to do a 3D render, or create visual effects. NOTE: You probably won't find yourself doing this with a GIF very often - GIFs are typically not very high quality image sequences. For example, you can use the free tool GIMP to edit images in bulk and still maintain quality. You can also use more tools for image sequence editing. You can also avoid choosing a video format if your production didn't decide which one to use. Some of that flexibility is in terms of editing - you can more easily crop a sequence of images in bulk while maintaining quality if you use an image sequence. First, they provide very high image quaility, and allow for more flexibility in a workflow. Image sequences are useful for a few reasons. Common image sequence containers include TIFF, PNG, TARGA, DPX and others. In fact, an image sequence is information about how to play a set of sequential images, the set of images, and other details like the compression algorithm all bundled together inside a container. It's the same as if you have a set of images labelled with a pattern that increases by one for each image (i.e. If you take a GIF file apart, one part of a GIF file is a series of images. GIFs are collections of images that are played in quick succession. Because they use a lossless compression, they're very big, so putting a bunch of GIFs on your mobile app or website might seem like a good idea but it will slow the performance. GIFs are especially useful if you're doing something with limited colors, well defined edges and lines, and plan to use them sparingly. So in this way, they are cost effective, because you are likely not paying to host the GIF somewhere (though that's possible, we have sites ike GIPHY for example). You don't have to do any special storage or processing for GIFs, you just add them to your website, they count as an image and play. The value of a GIF, is that it's counted as an image. This is pretty disappointing for those of us who say it with a hard G sound, but you can't always get what you want. GIF quality also typically isn't that great due to the color limitation.įun Side Note: The creators of GIF pronounced it JIF (same sound as J in jog). Take what I said about reducing file size with a grain of salt - video of the same length takes up much less space than a GIF of the same length. GIFs are compressed using the Lempel-Ziv-Welch lossless data compression, which reduces file size without degrading visual quality. Each image can contain up to 8 bits per pixel, allowing for a limit of 256 colors. GIFs work by compressing a set of frames or images into an image sequence that then loop for a set amount of time (or forever). This format was developed by a team led by Steve Wilhite at CompuServe. GIF is short for graphics interchange format, and first appeared in 1987. The difference lies in how the containers and files inside the containers are configured, as we'll soon find out. How does an image sequence differ from a video? Aren't all videos just sequences of images? In some respects, yes, in others no. A GIF differs from a video in that it's an animated sequence of images.
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