The onLoad callback of an image can be used to specify various properties and attributes of the image. Some of the properties include the size of the ray, Relative URL, and Specular reflection paths. These properties are used by the browser to display the image in its proper size. In this article, we discuss how to use these properties in a web application.

Object returned in onLoad callback

OnLoad callbacks for image resources are used to check whether the source has been properly loaded. These calls will fail if the resource cannot be found or cannot be downloaded. They are not used for static image resources. The image must first be downloaded and then loaded. Then, it must be cached. This is why you can’t preload images. However, you can use a preloaded image to show a loading indicator in the browser.

The onLoad callback for an image source should be set before the image source. Otherwise, the image source will be loaded before the callback.

Size of ray

The size of a ray at an image source is a fundamental aspect of image processing. Whether the ray is a sharp edge or a gradient, the size of the source is a critical consideration. A larger source results in less defined edges. This is because a ray will have a larger region to cover in the image detector.

Relative URL

Relative URLs are URLs that are relative to the current page or domain. This makes them safer than absolute URLs because they won’t break when the page is moved or copied. If you use this type of URL, you can share it with anyone, including other websites. This type of URL does not contain any protocol information.

Relative URLs work best for images hosted on your server. For high-quality images, however, you might want to use an absolute URL. However, this may not be an option if your hosting plan doesn’t allow it. An alternative solution is to use a third party image hosting solution.

Specular reflection paths

In optical imaging, a specular reflection occurs when light emitted from a source is reflected in a surface of some type. In this case, the image source is called the source S. The image source can be either a mirror or an object. The reflection coefficient of a specular reflection is usually equal to 1 – rd, i.e., the incident power of the light. This measurement enables the measurement of the effective width of a specular reflection, and is usually referred to as a specular highlight. This measurement can be performed with the use of a glossmeter to determine the glossy appearance of a surface.

The total impulse response of an image source is the sum of all the signals emitted by the sources in an image. This total response is equivalent to sound pressure against time, and the distance between the source and the receiver is equivalent to the length of a specular reflection path. As the image source is reflected into a boundary, the characteristics of the boundary will modify the frequency response of the image source.

Calculation time

To calculate the render time of an image source, it is necessary to enable the Timing-Allow-Origin header. Otherwise, the load time is exposed instead of the render time. In order to obtain more accurate metrics, this header must be used. If the image is cross-origin, the area fraction and the pixel count are not exposed. If the image source is cross-origin, the Timing-Allow-Origin header should be used.