That which stands out by opposition marks a contrast.
We must go to Latin to find the etymological origin of the term contrast . Specifically, we can determine that this word comes from the sum of two different parts: the prefix with -, which can be translated as "together", and the verb stare , which is equivalent to "stand up."
Contrast is the action and effect of contrasting (showing opposite conditions or marked differences, checking the accuracy of something). Contrast, therefore, can be the opposition or contrast that exists between things or people.
For example: "The press detected a marked contrast in the attitudes of both candidates" , "It was impossible not to notice the contrast between Dr. Castro's polished shoes and his son's worn sandals" , "That house is not so nice, but It draws attention due to the contrast it produces with the buildings around it .
Contrast in journalism
Taking this meaning into account, we would have to determine that the term we are now dealing with is used very frequently within the journalistic field. And in order for a media professional to be able to offer truthful information subject to reality, it is necessary to contrast the data they already have.
Thus, for example, when someone involved in an event gives you news, the logical thing is that you contact the other party involved to be able to compare it. This is how you will get to know what is really happening.
When there is an obvious difference between light and dark in an image, there is a noticeable contrast.
Intensity difference in an image
It is common to use the concept of contrast to name the relative difference in intensity that exists between a point in an image and its surroundings. When contrast is zero, it is impossible to distinguish an object from its background. On the other hand, the greater the contrast, the easier it is for differentiation.
Contrast, in the visual aspect of an image, also refers to the scarcity of intermediate tones, so that light and dark clearly stand out . An image composed of white squares and black squares will show an obvious contrast; On the other hand, if the squares included various shades in a gray scale, the contrast would be non-existent.
Contrast substance
The substance that is introduced into the body to make the organs observable using X-rays or other similar methods is known as contrast. Without this contrast, the image that the professional intends to analyze would not be visible.
Iodine and barium are the two elements that give shape to that substance that is introduced into the body of the patient in question in order to subject it to tests such as x-rays or magnetic resonance imaging with which it will be possible to know what is happening to them. Thus, results will be obtained that will allow you to discover what disease you are suffering from, the state of the pathology that has already been diagnosed or what actions must be carried out in terms of treatment.
In cases of cancer, kidney problems or gastrointestinal diseases, contrast is usually used.
The hallmark, finally, is the mark that functions as a guarantee of the noble metal objects that have been hallmarked (that is, that their authenticity has been verified).