Film contrast is the ability of X-ray to contrast.

Film contrast is the ability of X-ray film to amplify X-ray contrast.

The concept of x-ray contrast;

X-ray contrast refers to the difference of absorption capacity of different tissues or structures in an object, and the difference of black and white degree that can be observed through X-ray imaging. Areas with higher object density absorb more X-rays and present brighter images. However, areas with low object density absorb less X-rays and present darker images. X-ray contrast depends on the tissue characteristics of the irradiated object and the parameter setting of the X-ray source.

Related concepts of film contrast;

The magnification ability of film contrast reflects the sensitivity and linear range of film. When X-rays irradiate the film, the photosensitive particles will be excited and form an image. Film contrast can enhance or reduce the image difference caused by X-ray contrast.

If the film contrast is high, it can obviously enlarge the subtle differences between objects with different densities, and make the distinction between black and white in the image clearer. On the contrary, low contrast film will blur the density difference between different tissues or structures in the image.

The role of the film:

1, image recording

Film is a kind of photosensitive material, which can record images irradiated by light or rays. In photography, film, as a photosensitive medium, records images by capturing the changes of light. In medical imaging, especially in X-ray photography, film can record the internal structure of various parts of the body and help doctors to make diagnosis and treatment.

2. Image preservation

Film has long-term preservation performance and can retain the original information of the image. This is very important for the preservation of cultural heritage, historical archives and evidence and research data. Compared with electronic media, movies can be watched and used directly without additional equipment.

3. Image reproduction and distribution

Film can be used to make multiple copies and can be easily distributed to others. In photography, the reproduction and printing of films enable photographic works to be produced on a large scale and widely spread in exhibitions and art sales. In medical imaging, film reproduction can be used for medical records and teaching purposes, such as case sharing and academic exchange.

4. Artistic expression

Film is widely used in photography because of its unique texture and image style. Different types of films can produce different colors, contrasts and graininess, which can meet the needs of photographers for image expression and creative exploration.