![]() Each opaque GIF can be downloaded by clicking the save buttons below the GIF preview area. ![]() This way you can add a solid background to GIFs and fill transparent gaps with any color in any frame you need. ![]() You can also fill only certain frames or a range of frames if you enter frame numbers, such as "2, 5, 10" or a range of frames "4-50". You can fill all GIF frames with the same color if you enter the star symbol "*" in the option "Frames to Fill". It replaces the color indexes that are used for the transparency with a different color index that you can enter in the options. Coming soon, we'll also be adding other interesting optimization techniques: optimizing by reducing the color palette to fewer colors (for example, from 256 colors to 32), optimizing via dithering, optimizing by the GIF disposal method, optimizing by creating partial frames with modified x, y, width, height arguments, optimizing by dropping repeated frames, optimizing by using a lossy GIF compression algorithm, and optimizing by dropping local color tables and using only the global color table.This is a browser-based program that converts transparent GIF regions to non-transparent GIF regions. The size of the new GIF file can be seen in the options by clicking the "save as" and "download" buttons. Our program lets you immediately see the result of transparency and frame skip optimization methods in the browser's GIF preview windows. You can use one of the methods or multiple methods at once. You can enable or disable each of the optimization methods in the options. If you skip every second frame, the GIF file size can be reduced by 40%. This optimization method is very effective. When skipping frames, the duration of the GIF does not change because the optimizer increases frame delays of the remaining frames to preserve the original GIF duration. For example, "1, 3, 6", which means skip frames one, three, and six, or "2-10", which means skip all frames from the second to the tenth. You can also delete specific frames that you enter. You can skip every 2nd, 3rd, 4th, or nth frame starting from any frame. The skip-frame optimization changes the number of frames in a GIF. This method is less efficient than transparency optimization but a value of 10 - 30 pixels creates visible a result. A larger sampling radius introduces tiny errors in the quantizer that leads to better optimization. The quantizer optimization changes the pixel sampling radius of the quantizer. Usually, it is sufficient to enter a small similarity threshold value of 1% - 5% to obtain good optimization results. Pixel similarity is defined via the threshold option. If the pixels in the next frame are the same (or very similar) to the pixels in the current frame, then they are made transparent in the next frame and as a result, they are skipped. The transparency optimization compares pixels frame by frame. There are several optimization techniques that we have implemented: transparency optimization, quantizer optimization, and frame-drop optimization. ![]() Optimizing a GIF has many benefits – it uses less computer memory and loads much faster in the browser because there is less data to decode. This is a browser-based program that optimizes GIF animations.
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