Book Images

Google provides several Search features and products that help users visually discover information on the web, such as the text result images, Google Discover, and Google Images. While each feature and product looks different, the general recommendations for getting images to appear in them is the same.

The technical requirements for getting your content in Google's search result applies to images too. Since images are a substantially different format compared to HTML, it means there are additional requirements for getting images indexed; for example, finding the images on your site is different, and the presentation of the images also influences whether an image is indexed at all, and for the right keywords.

Book Images

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Using standard HTML image elements helps crawlers find and process images. Google parses the HTML elements (even when they're enclosed in other elements such as elements) in your pages to index images, but doesn't index CSS images.

Unlike regular sitemaps, you can include URLs from other domains in the elements of the image sitemaps. This allows you to use CDNs (content delivery networks) to host images. If you're using a CDN, we encourage you to verify ownership of the CDN's domain name in Search Console so that we can inform you of any crawl errors that we may find.

Designing responsive web pages leads to better user experience, since people can access them across a plethora of device types. Refer to our guide to responsive images to learn about the best practices for handling images on your website.

Web pages use the element or the srcset attribute of an img element to specify responsive images. However, some browsers and crawlers do not understand these attributes. We recommend that you always specify a fallback URL via the src attribute.

You can also inline images as Data URIs. Data URIs provide a way to include a file, such as an image, inline by setting the src attribute of an img element as a Base64-encoded string using the following format:

While inlining images can reduce HTTP requests, carefully judge when to use them since it can considerably increase the size of the page. For more on this, refer to the section on pros and cons of inlining images on our web.dev page.

High-quality photos appeal to users more than blurry, unclear images. Also, sharp images are more appealing to users in the result thumbnail and can increase the likelihood of getting traffic from users. That said, images are often the largest contributor to overall page size, which can make pages slow and expensive to load. Make sure to apply the latest image optimization and responsive image techniques to provide a high quality and fast user experience.

If you include structured data, Google can display your images in certain rich results, including a prominent badge in Google Images, which give users relevant information about your page and can drive better targeted traffic to your site.

Google extracts information about the subject matter of the image from the content of the page, including captions and image titles. Wherever possible, make sure images are placed near relevant text and on pages that are relevant to the image subject matter.

Likewise, the filename can give Google very light clues about the subject matter of the image. When possible, use filenames that are short, but descriptive. For example, my-new-black-kitten.jpg is better than IMG00023.JPG. Avoid using generic filenames like image1.jpg, pic.gif, 1.jpg when possible. If your site has thousands of images, you might want to consider automating the naming of the images. If you localize your images, remember to also translate the filenames, keeping in mind the URL encoding guidelines if you're using non-latin or special characters.

The most important attribute when it comes to providing more metadata for an image is the alt text (text that describes an image), which also improves accessibility for people who can't see images on web pages, including users who use screen readers or have low-bandwidth connections.

Google uses alt text along with computer vision algorithms and the contents of the page to understand the subject matter of the image. Also, alt text in images is useful as anchor text if you decide to use an image as a link.

Google will still crawl your page and see the image, but will display a thumbnail image generated at crawl time in search results. This opt-out is possible at any time, and doesn't require re-processing of a website's images. This behavior isn't considered image cloaking and won't result in manual actions.

SafeSearch is a setting in Google user accounts that specifies whether to show, blur, or block explicit images, videos, and websites in Google Search results. Make sure Google understands the nature of your site so that Google can apply SafeSearch filters to your site if appropriate. Learn more about labeling pages for SafeSearch.

The following is a listing of pictures electronically placed on the phonograph records which are carried onboard the Voyager 1 and 2 spacecraft. The contents of the record were selected for NASA by a committee chaired by Carl Sagan of Cornell University, et. al. Dr. Sagan and his associates assembled 115 images and a variety of natural sounds, such as those made by surf, wind and thunder, birds, whales, and other animals. To this they added musical selections from different cultures and eras, and spoken greetings from Earth-people in fifty-five languages, and printed messages from President Carter and U.N. Secretary General Waldheim. Each record is encased in a protective aluminum jacket, together with a cartridge and a needle. Instructions, in symbolic language, explain the origin of the spacecraft and indicate how the record is to be played. The 115 images are encoded in analog form. The remainder of the record is in audio, designed to be played at 16-2/3 revolutions per minute. It contains the spoken greetings, beginning with Akkadian, which was spoken in Sumer about six thousand years ago, and ending with Wu, a modern Chinese dialect. Following the section on the sounds of Earth, there is an eclectic 90-minute selection of music, including both Eastern and Western classics and a variety of ethnic music. Once the Voyager spacecraft leave the solar system, they will find themselves in empty space. It will be forty thousand years before they make a close approach to any other planetary system.

Credit: National Astronomy and Ionosphere Center, Cornell University (NAIC)

Please note that these images are copyright protected. Reproduction without permission of the copyright holder is prohibited.

The diagram of male and female image is one of the pictures electronically placed on the phonograph records which are carried onboard the Voyager 1 and 2 spacecraft.Credit: Jon Lomberg

Please note that these images are copyright protected. Reproduction without permission of the copyright holder is prohibited.

Notes on external images: External images might be under copyright. If you do not get permission to use it, you may be in violation of copyright laws. In addition, you cannot control external images; they can suddenly be removed or changed.

Aside from sculpture and other physical activities that can create three-dimensional images from solid material, some modern techniques, such as holography, can create three-dimensional images that are reproducible but intangible to human touch. Some photographic processes can now render the illusion of depth in an otherwise "flat" image, but "3-D photography" (stereoscopy) or "3-D film" are optical illusions that require special devices such as eyeglasses to create that illusion of depth.

Copies of 3-dimensional images have traditionally had to be crafted one at a time, usually by an individual or team of artisans. In the modern age, the development of plastics and other technologies made it possible to create multiple copies of a 3-dimensional object with less effort; the advent and development of "3-D printing" have expanded that capability.

The word 'image' is also used in the broader sense of any two-dimensional figure such as a map, graph, pie chart, painting, or banner.[clarification needed] In this wider sense, images can also be rendered manually, such as by drawing, the art of painting, or the graphic arts (such as lithography or etching), rendered automatically by printing or computer graphics technology, or developed by a combination of methods.

On the other hand, some processes can be used to create visual representations of objects that are otherwise inaccessible to the human visual system. These include microscopy for the magnification of minute objects, telescopes that can observe objects at great distances, X-rays that can visually represent interior structures of the human body (among other objects), magnetic resonance imaging (MRI), positron emission tomography (PET scans), and others. Such processes often rely on the detection of electromagnetic radiation that occurs beyond the light spectrum visible to the human eye, converting such signals into recognizable images. e24fc04721