png8Ī variant of the PNG format with 8-bit transparency and palette-based color. The output format in that case will match the input format. Setting fm=png when the input file is a PNG will serve as an alias to fm=png8 or fm=png32. The PNG file format is a common graphics format, often used for application assets. The PNG file format is a lossless format. The image will briefly appear pixelated and will sharpen focus as the rest of the data loads.īy using pjpg, you are guaranteeing progressive rendering for JPEG instead of letting imgix decide when to apply progressive or baseline encoding. With proper client-side display support, Progressive JPEGs can load an initial version of the image with only a portion of the image data. Progressive JPEG offers advantages over traditional JPEG files, including potentially smaller file sizes and faster perceived load times than typical baseline JPEGs. It does not support transparency or animation. The Progressive JPEG file format is a lossy format. To deliver a JPEG XR file lossless, set lossless=true in addition to fm=jxr.įor a list of browsers that support the JPEG XR format, please see the JPEG XR section on. JPEG XR supports higher compression ratios for encoding an image with equivalent quality (compared to JPEG). The JPEG XR file format is a lossy format, but also supports lossless compression. Depending on the parameters used to render the asset, imgix will choose the better of the two options. This is because progressive JPEGs are preferable to baseline JPEGs in terms of size and display speed, though in some cases (such as smaller images), baseline will be better. Note: In most cases, images rendered in imgix as JPEGs will use progressive encoding. See the q parameter for controlling the quality of the image. JPEG is one of the most common formats on the web. However, JPEG 2000 has been less widely adopted among browsers.įor a list of browsers that support JPEG 2000, please see the JPEG 2000 section on. It also degrades more gracefully than JPEG at lower bitrates. JPEG 2000 compresses slightly better than JPEG in many cases (roughly 10% for equivalent quality). The JPEG 2000 file format is a lossy format. If you’re interested in using imgix to optimize your animated GIFs, please contact our sales team. Premium Feature Animated GIF functionality is currently available to all Premium imgix customers. GIF files make use of limited color palettes. imgix supports both animated GIFs and static GIFs. The GIF image format is a file format popularized for its ability to create simple animations. It supports transparency, but only in a very limited capacity (1-bit). If WebP is not supported, imgix will fall back to the source image type or to any format specified by the fm parameter.Īt this time, animated AVIFs are currently not supported in Firefox and any animated AVIF returned to a Firefox browser will render as a static AVIF. If auto=format is set and the browser does not support the AVIF format, we'll first fallback to WebP if it is supported. This allows AVIF image files to be up to 50% lighter than JPEG files and up to 30% lighter than WebP files.įor a list of browsers that support AVIF, please see the AVIF section on. The advantage of AVIF is that the compression algorithms were originally developed for video in an image format. The AVIF image format provides greater reduction in file size when compared with JPEG, PNG and WebP formats. The AVIF image format is an image format which supports any image codec. The AVIF file format supports lossy and lossless image formats. Valid options are avif, gif, jp2, jpg, json, jxr, pjpg, mp4, png, png8, png32, webm, webp, and blurhash. The output format to convert the image to.
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