Those are all sizes that are already generated for the used image in the WordPress Media Library AND have the same aspect ratio.
Why are my choices not exactly 1X or 2X?
The File Size Optimizer looks at the required media size throughout all device layouts and in that way evaluates the available Dimensions. If available, there is always a choice shown that is the closest to 1X or 2X. If no fitting size is available, you can hover the standard (1X) or retina (2X) lines to get an info on the currently optimal size for your media.
*One License / Purchase Code is required for each Website
Terms of using JPG Images from the Library
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The pictures are free for personal and even for commercial use.
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You can modify, copy and distribute the photos. All without asking for permission or setting a link to the source. So, attribution is not required.
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The only restriction is that identifiable people may not appear in a bad light or in a way that they may find offensive, unless they give their consent.
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The CC0 license was released by the non-profit organization Creative Commons (CC). Get more information about Creative Commons images and the license on the official license page.
*One License / Purchase Code is required for each Website
Terms of using HTML5 Videos from the Library
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The videos are free for personal and even for commercial use.
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You can modify, copy and distribute the videos. All without asking for permission or setting a link to the source. So, attribution is not required.
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The only restriction is that identifiable people may not appear in a bad light or in a way that they may find offensive, unless they give their consent.
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The CC0 license was released by the non-profit organization Creative Commons (CC). Get more information about Creative Commons images and the license on the official license page.
Usage only allowed within Slider Revolution Plugin
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A variety of sizes and densities can be also downloaded from the git repository , making it even easier for developers to customize, share, and re-use outside of Slider Revolution.
Please check the listed license files for details about how you can use the "FontAwesome" and "Stroke 7 Icon" font sets for commercial projects, open source projects, or really just about whatever you want.
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Please respect all other icon fonts licenses for fonts not included directly into Slider Revolution.
Further License Information
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Font Awesome 4.6.3 by @davegandy - http://fontawesome.io - @fontawesome License - http://fontawesome.io/license(Font: SIL OFL 1.1, CSS: MIT License)
