Different Types of Image File Formats

In this digital era, visual content such as images has become an integral part of improving the online user experience. The world is visual and different image file formats are spread all over the internet, each image file format will serve you in a particular way so you have to choose them according to your needs. Adding images to your web pages or applications is not enough, you need to optimize them the right way. Uploading large images is not the correct way to optimize because it can slow down your website and drive customers away.

As content on the web becomes more visual, it's important to have a basic understanding of the Image File Formats. Some image file formats are very popular and they can not be used in web content such as GIF files. Others are often used interchangeably, without any real understanding of their Pros and Cons such as JPEG or PNG File Formats. JPG, GIF, TIFF, PNG, BMP, RAW, and WEBP are some of the most popular image file formats. There are many other file types used to encode Digital Images.

Images are essential for any website, especially for E-commerce websites, that want to win Customers with product images. However, not all images are created equal, and depending upon the Image file format, Your Images can significantly impact your website’s core vitals such as Performance, Appearance, Compatibility, and Scalability. Choosing the right web Image file format for your web portal is not a trivial decision and it requires the balance between quality and performance, flexibility and consistency, innovation and compatibility.

Different Types of Image File Formats

In General image file formats are can basically be sorted into 2 categories one is Raster Graphics and the second is Vector Graphics.

Raster Graphics: Bitmap images or Raster Graphics is a dot matrix data structure that represents a generally rectangular grid or pixels (points of color), viewable through monitor, paper, or other display medium. These Images are stored in image files with varying formats. A bitmap is a rectangular grid of pixels, with each pixel's color being specified by the number of bits. A bitmap might be created for storage in the display's video memory or as a device-independent bitmap file. A raster is technically characterized by the width and height of the image in pixels and by the number of bits per pixel. Some of the common Raster image formats are:

JPEG (Joint Photographic Experts Group)
PNG (Portable Network Graphics)
GIF (Graphics Interchange Format)
WebP (Web Picture)
AVIF (AV1 Image Format)

Vector Graphics: Vector graphics are mathematically based computer graphics images that are defined in terms of 2D points, and these images are connected by lines and curves to form polygons and any other shapes. Each of these points contains the definite position on the x- and y-axis of the work plane and it determines the direction of the path; further, each path contains various properties including values for stroke color, shape, curve, thickness, and fill. The most common vector image formats are

SVG (Scalable Vector Graphics)
EPS (Encapsulated PostScript)
AI (Adobe Illustrator Artwork)
PDF (Portable Document Format)

Different Types of Image Color Formats

There are a few different types of Image color formats that you may come across. The most common Types of Image Color Formats are RGB, CMYK, and grayscale.

RGB files: RGB files use Red, Green, and Blue light to create colors. This Image format is used by most digital cameras and is the default color format for images on the web. The most popular image formats that use RGB colors are JPEG, PNG, and GIF files.
CMYK File: CMYK files use cyan, magenta, yellow, and black ink to create colors. This format is used for printing as it provides the widest range of colors possible. The most popular image formats that use CMYK colors are PDF, PSD, and TIFF Files.
Grayscale images: These Images only use black and white tones. Grayscale images are useful for saving file space or for images that will be edited later.

Some of the Most Common File Extensions

JPEG or JPG (Joint Photographic Experts Group): JPEG is the most common file format on the web. Images can be compressed to varying degrees making the file smaller but eventually adding noticeable grainy and artifacts textures. JPEG (.jpeg or .jpg) is great for displaying photos online when perfect quality is not as important as fast load times. It is a lossy compression file format, which means the image is compressed to make a smaller file. Due to the compression, there is a slight loss in image quality, however, this loss is generally not noticeable. You can adjust the degree of compression for optimal storage quality and size.

PNG (Portable Network Graphics): A PNG file is a lossless image format that was originally designed to improve and replace the GIF format. PNG Images (.png) can handle up to 16 million, colors unlike the 256 colors supported by the GIF image file type. PNG Image types are a raster file format, meaning that they store images as a grid of pixels. This makes PNG files a Good format for images that need to be displayed on Web pages, as they will look high quality regardless of the size of the Photo.

GIF (Graphics Interchange Format): GIF files are widely used for web graphics. the use of GIF (.gif) image files on social media platforms is also pretty common these days. GIF files are typically small and size and are very portable. GIFs are limited to displaying no more than 256 colors. This makes photographs and any graphics with a gradient look low-quality, while images with few colors can benefit from the small file size. GIF files are also compressed but to a lesser extent than JPEG files.

TIFF (Tagged Image File Format): TIFF files are commonly used by photographers and printers. These images are uncompressed and, therefore are going to be larger than JPEGs and PNGs. TIFFs (.tif or .tiff) are widely supported by most image editing and viewing programs but can not be displayed by most web browsers. These image extensions were developed in 1986. These images are lossless image files for storing raster images. Photographers, graphic designers, and the publishing and printing industry mostly use TIFF image file extensions.

PDF (Portable Document Format): PDF is a file system developed by Adobe, that is highly flexible and widely used. PDF files are capable of containing both Vector and Bitmap content editable by Adobe Photoshop and Adobe Illustrator. PDF (.pdf) files are a type of file format that is used to present documents in a layout that cannot be changed. It means that the document will look the same on any device, regardless of the software used to open it. PDF Files are often used for documents that need to be printed as they will maintain their layout and formatting. PDFs are not generally accessible, search-optimized, or responsive on phones, making them a poor choice for distributing content over the internet. You can use PDF file format to save images, illustrations, magazine covers, and much more.

WebP (Web Picture Format): WebP is a raster image format developed by Google in 2010 as a new standard for Web Images. WebP (.webp) uses lossy and lossless compression, animation, and transparency to create high-quality images with smaller file sizes than JPEG, PNG, and GIFs. WebP is based on the VP8 Video codec and open and royalty-free video compression technology. WebP works by applying different compression methods depending on the content and type of the images. WebP uses predictive coding for lossy compression to encode an image similar to JPEG. For lossless compression, WebP uses already-seen image fragments to reconstruct new pixels, similar to PNG image format exactly. WebP is designed to be an efficient and versatile image format for the modern internet era, where speed and quality are essential, these formats can handle any kind of web image with optimal quality and performance, such as a photo, a logo, an icon, or an animation.

AVIF (AV1 Image Format): The AVIF image file format is fairly recent and promises to be as versatile as JPEG concerning compression while retaining more quality and resolution. The AVIF (.avif) image file format can be 50% smaller than a JPEG Format without losing the quality of the Image. As it is the recent file format AVIF image file format is still not very common in search engines or on the web.

AI (Adobe Illustrator Format): The AI image file format is the default vector graphics file extension that is used by the program Adobe Illustrator. The AI (.ai) image file stores all the graphical data using the mathematical relationships between lines and points and other objects. These images cannot be displayed on the web, but they are good to keep around in case you ever want to edit the image in the future.

PSD (Photoshop Document Format): The PSD file contains an image with layers and masks. Each layer in the file is stacked on top of the other, allowing users to create and edit images using multiple levels of transparency. A PSD (.psd) file can hold as many as 30,000 pixels (both width and height), and file size can extend up to 2 gigabytes. These files contain multiple image layers and various imaging options. Graphic Designers, Artists, Publishers, and many other professionals use PSD files.

BMP (Bitmap Format): BMP is a file format developed by Microsoft for Windows that is commonly used for images with limited color palettes including logos and cartoons. BMP (.bmp) file extensions are uncompressed, meaning that they take up more space than other file formats. Like TIFF, in Image file format there is no compression or information loss with BMP files, resulting in high-quality images with large file sizes. However, they are also a bitmap file format, which means that they store images as a grid of pixels. This makes them a good format for images that need to be displayed on web pages as they will look sharp regardless of the size of the image.

EPS (Encapsulated PostScript Format): EPS File is a file format that is commonly used for vector images. EPS (.eps) files are typically used for logos and other graphics that need to be reproduced in multiple sizes. EPS files are also a vector file format which means that they store images as vectors rather than pixels. This makes them ideal for images that need to be printed or used for other high-resolution purposes.

HDR (high-dynamic range Format): HDR is a file format that allows for greater details and color depth than traditional image files. It means that HDR (.hdr) files can show more information in the shadows and highlights of an image as well as provide more accurate colors overall. These Files are created by combining multiple images of the same scene, each exposed for a different length of time.

SVG (Scalable Vector Graphics Format): SVG (.svg) is an XML vector image format that is generally used for logos and other designs that must be reproduced in at variety of sizes. This makes them ideal for high-resolution images that will be printed or used for other high-resolution activities.

HEIC (High-Efficiency Image Format): HEIC file format is a new image compression standard that offers better compression than JPEG while preserving quality. Apple introduced the HEIC (.heic) file format with iOS 11 and macOS High Sierra, which is why Apple iPhone users will come across this file format when sharing photos.

RAW Format: RAW image files are uncompressed, unedited images that are captured by a digital camera's sensor. RAW (.raw) image files contain all of the image data that is collected by the sensor, which makes them a good format for post-processing. These image file formats can be edited in software such as Photoshop or Lightroom to adjust the exposure, white balance, and other settings.

Frequently Asked Questions (FAQs)

Question 1: What is Lossy and Lossless Compression?

Answer: Lossy Compression means the image is compressed in a way that reduces visual quality. while Lossless Compression means it can reduce file size, but preserve visual quality. Lossy compression algorithms always have a superior compression ratio as compared to lossless compression.

Question 2: How to choose the Right Image File Format?

Answer: There are four universally supported image file formats on the Internet such as GIF, PNG, JPEG, and SVG. In addition, to these formats, some browsers also support newer formats such as WebP, which offers better overall compression and more features. So its upto you which image format you need for your work.

Question 3: What is Lazy Loading?

Answer: Lazy loading is a technique to reduce page load times by defering the loading of images until they are needed. Because fast load times significantly benefit user experience, search engine rankings often improve as well.

The Final Verdict

There are many Image file formats to choose from when saving and editing your digital photos. Each file format has its own set of benefits and drawbacks, so it's important to understand which one will work best for your needs. Generally speaking, the best formats for printing are TIFF and PDF. On the other hand, you can use JPEG, GIF, or even PNG for social media and WebP for Web pages.