What are file extensions?

Windows-based files come in a variety of formats and are indicated in English with a period at the end of the file name. The string of characters after this period is called in technical termsExtension"We call it "the

Typical extensions are ".docx" or ".doc" for WORD files, ".doc" for EXCEL files, etc..".xlsx" and ".xls".

Image files come in a variety of formats and require specialized programs called application software for each extension.

Sometimes there are image files that cannot be opened, which means that the corresponding software is not installed on your computer.

Six commonly used image extensions

The most commonly used image extensions arejpeg, gif, png, svg, tiff, heicare available. The characteristics and official names of each are as follows.

 .jpeg (jpeg)

The official name is.Joint Photographic Experts Groupis. The name of the standardized group is used as the file name as it is.

JPEG is an image format suitable for photographs. It is often used on websites because it can compress and save data with much of the information invisible to the human eye cut off.*Supplement 1

In addition, theFull color 16.7 million colorsExpression is important because it can handle up toPhotographs and gradient imagesIt is suitable for

*Supplement 1
The heavier the images, the more data is transferred and the server is overloaded, which slows down the page display speed and causes more visitors to leave the page.

However, since it is a lossy compressed image format, repeated processing and overwriting will degrade the image. when editing a JPEG image, do not edit the original image directly, but process a copy.

.gif

The official name is.Graphics Interchange Format.It is the most widely used image format on the Internet along with JPEG. It is the most widely used image format on the Internet, along with JPEG.

It is often used on websites because it offers a higher compression ratio than JPEG for images with fewer colors.

Moreover, unlike JPEG, lossless compression does not degrade image quality even if the image is repeatedly processed and overwritten and saved.

GIF animationThis function combines multiple images into one to create a parallel comic strip.Transparent colors can also be expressed.

Since there is only a maximum of 256 colors, it is not possible to express complex tints. Therefore, it is suitable for title logos, animations, icons, buttons, and illustrations, not photographs.

Another drawback is that there is not much free software available due to the use of Unisys' patents.

.png (ping)

The official name for PNG is "Portable Network GraphicsIt was developed by the W3C (a non-profit organization that standardizes web technologies) as an alternative image file format to GIF, which has patent issues with Unisys.

Basically, like GIF, it is lossless compression and can be restored to its original quality even if it is saved in low quality. It is also possible to restore the original image quality even after saving at a low quality.Transparent colors can also be used.

The only thing better than a GIF isFull color 16.7 million colorsThe most important features of the system are that it is compatible with the "IEEE 802.11b" standard and that it offers a wide range of free software for viewing and editing.

However, PNGs tend to be slightly larger than JPEGs and GIFs. Also, PNGs may not be displayed on older browsers.

.svg (SVG)

The formal name for SVG isScalable Vector GraphicsIt is.

JPEG, GIF, PNG, and TIFF areSet of colored dotsand the larger the magnification, the rougher the image. The technical term for this isBitmap image (or raster image)We call it "the

SVG, on the other hand, is aVector image (or vector image)It is calledPoints and lines are converted into numerical values, which are then calculated and displayed by a computer.The image will not become rough even if it is enlarged because the image will be enlarged to the size of the original image.

Creating a website using SVG images allows for beautiful image quality on both small smartphone monitors and large, high-resolution displays. The amount of data in the image file is also reduced.

The disadvantage of SVG is that it is difficult to express delicate color schemes and fine outlines like photographs because it is expressed by connecting points and lines. Therefore, SVG is best suited for website logos and titles.

.tiff

The official name is.Tagged Image File FormatThe image is a JPEG. Because data is stored uncompressed, images are not degraded and are more beautiful than JPEGs.

It is widely used for printed materials such as brochures and catalogs, and is also used as an image format for digital cameras that require high resolution.

However, because it is uncompressed, the file size is much larger than other extensions.

TIFF is not a usable format for website images, so if you want to use it on your blog, you will need to use conversion software to change the image to a JPEG or other format.

.heic (HEC)

HEIC is used by the iPhoneApple proprietary extensionsand uses a compression method called "High Efficiency Image File (HEIF)".

This method replaces the conventional JPEG format, which tends to be heavy in order to cope with the problem of ever-increasing photo data size.

For Windows-based computers, dedicated software is required to view HEIC images.