- Halftone
- In order to simulate the reproduction of continuous tone images with ink on paper it is necessary to convert the continuous tone image into a halftone image. Black ink is just that...black. To print a gray tone from black we print many closely spaced black dots on white paper. The dots are so small that the eye doesn't see them so what it does see is the mixture of black ink dots and bare white paper between the dots which appears to be gray. A 50% gray would have dots sized so that they covered half of the area with black ink and left half of the area as bare paper.
- Histogram
- A vertical bar graph displaying the distribution of the tonal values of the pixels in an image. The X axis represents the tonal value of the pixels (0-255) and the Y axis represents the number of pixels having that tonal value.
- hot shoe
- If your camera does not have a built-in flash you can attach a separate flash unit to the hot shoe bracket. The hot shoe acts as a connector between flash and camera and when you take a picture the camera sends a small electrical signal to the flash to go off at the same time.
- hot spots
- Hot spots are unexpected bleached-out patches of white light found on your prints after your flash has been reflected by a shiny surface. Glass picture frames windows and spectacles can all cause hot spots if you aim your flash directly at them so always shoot these objects at an angle.
