The requirements and main use cases of HEIF were defined in 2013. 3.5 JPEG compression formats in HEIF files.HEIF was adopted by Apple in 2017 with the introduction of iOS 11. Introduced in 2015, it was developed by the Moving Picture Experts Group (MPEG) and is defined as Part 12 within the MPEG-H media suite (ISO/IEC 23008-12). HEIF files are a special case of the ISO Base Media File Format ( ISOBMFF, ISO/IEC 14496-12), first defined in 2001 as a shared part of MP4 and JPEG 2000. Such files require less storage space than the equivalent quality JPEG. HEIF files containing HEVC-encoded images are also known as HEIC files. HEVC is an image and video encoding format and the default image codec used with HEIF. HEIF can store images encoded with multiple coding formats, for example both SDR and HDR images. The standard covers multimedia files that can also include other media streams, such as timed text, audio and video.

High Efficiency Image File Format ( HEIF) is a container format for storing individual digital images and image sequences. Image/heif, image/heif-sequence image/heic, image/heic-sequence image/avif, image/avif-sequenceĭepends on contained Format (e.g. With given format, which firefox does not support fully, the extension is removed.heif. Plausible Issue: HEIC & HEIF have Patent Issues which make it hard to support in free software without licensing concerns. Working Case : Content-Type is application/octet-stream Non-Working Case : Content-Type is image/heic

]Īll this, only when you get access to that machine & that webserver !īy comparing 'Working Case' with 'Non-Working Case', OP has seen the Difference in Content-Type : (4) Check with some other user & some other machine (maybe having some other OS) to make further eliminations. (3) Try changing the file names on the webserver to eg (3A) lowercase, img5248.heic (3B) 'multiple' extensions,, & to check which 'Part' is getting left out (3C) Deliberately 'incorrect' extension, img5248.png Does that get the correct extension ? Is it confirmed that only HEIC is having the Issue ? (2) In case those work correctly, try uploading some PNG (& DOC & txt) to your webserver and try to Download that. Is it getting saved with the correct extension ?Ĭheck and Download some PNG file to check whether that gets the correct extension (1) Check whether you can Download some HEIC files from here : We have to check whether the Issue is with your webserver or webbrowser or something else

Heic image extensions