Your app needs to find the size or type of an image. This could be for adding width and height attributes to an image tag, for adjusting layouts or overlays to fit an image or any other of dozens of reasons.
But the image is not locally stored – it’s on another asset server, or in the cloud – at Amazon S3 for example.
You don’t want to download the entire image to your app server – it could be many tens of kilobytes, or even megabytes just to get this information. For most common image types (GIF, PNG, BMP etc.), the size of the image is simply stored at the start of the file. For JPEG files it’s a little bit more complex, but even so you do not need to fetch much of the image to find the size.
FastImage does this minimal fetch for image types GIF, JPEG, PNG, TIFF, BMP, ICO, CUR, PSD, SVG and WEBP. And it doesn’t rely on installing external libraries such as RMagick (which relies on ImageMagick or GraphicsMagick) or ImageScience (which relies on FreeImage).
You only need supply the uri, and FastImage will do the rest.
FastImage alternatives and related gems
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