Kuvakäyrät

Kuvakäyrät, meaning "image curves" in Finnish, is a term used to describe graphical representations of visual information, often in the context of digital image processing and analysis. These curves can illustrate various properties of an image, such as its color distribution, brightness levels, or contrast characteristics. One common type of kuvakäyrä is a histogram, which displays the frequency of different pixel intensity values within an image. By examining the shape and spread of a histogram, one can gain insights into the overall exposure and tonal range of a photograph.

Another application of kuvakäyrät is in the manipulation of image contrast and brightness. In image editing software, adjustment curves allow users to manually alter the tonal response of an image by remapping the original pixel values to new ones. These curves typically plot the original intensity values on the horizontal axis and the new, adjusted values on the vertical axis. By modifying the shape of this curve, users can selectively lighten or darken specific tonal ranges, thereby enhancing detail or correcting exposure issues. Kuvakäyrät can also be used to represent the relationship between different color channels, aiding in color correction and grading.