2014年5月2日 · I often use JPEG images, and I have noticed that there are two very similar file extensions: .jpg, which my mobile's camera and the Preview application use, and .jpeg, with which Image Capture save...

JPEG JPEG (Joint Photographic Experts Group) files are (in most cases) a lossy format; the DOS filename extension is JPG (other OS might use JPEG). Nearly every digital camera can save images in the JPEG format, which supports 8 bits per color (red, green, blue) for a 24-bit total, producing relatively small files.

File extension.JPEG is only known as a video type while file extension .jpeg is an image type (when did lowercase and uppercase letters start mattering!?). At the same time, jpeg2000 is type video yet RFC 3745 considers JPEG 2000 an image type! The IANA list seems to cater to company-specific jpeg formats (e.g. vnd.sealedmedia.softseal.jpg).

When saving image files, does it matter if the format type (jpg for example) is all lowercase or all uppercase? Most programs default all lowercase while Microsoft's Snipping Tool defaults all upper case, so I wonder why the inconsistency?

2016年8月9日 · The size difference is merely because of a slightly different algorithm, configuration settings, or decisions that the JPEG encoder made at the time the file was saved. Because JPEG is a lossy file format, it's possible to get different file …

2016年7月6日 · JPEG is a single-page file format. Motion JPEG is a motion video adaptation of the JPEG standard for still photos. MJPEG treats a video stream as a series of still photos, compressing each frame individually, and uses no interframe compression. The advantage of using the JPEG compression is that it has low complexity while doing a decent job of …

2012年2月24日 · The only difference I can see with the other pictures is that this one has a capitalized ".JPG" extension instead of a lowercase ".jpg" one. However, if I try to rename the file to a lowercase extension Windows 7 just capitalizes it again.

2018年9月9日 · In the higher end of quality range, a well-optimized JPEG can be similar or better than WebP. However, most of file size differences in modern lossy codecs are due to difference in quality.

2010年2月26日 · When should certain image file types be used when building websites or interfaces, etc? What are their points of strength and weakness? I know that PNG & GIF are lossless, while JPEG is lossy...

2009年9月15日 · The JPEG File Interchange Format (JFIF) is an image file format standard. It is a format for exchanging JPEG encoded files compliant with the JPEG Interchange Format (JIF) standard. It solves some of JIF's limitations in regard to simple JPEG encoded file interchange. So all JPEGs are JFIF.