Gamma Explained. Technical briefing: Gamma If you’ve worked in design for any appreciable time you’ll have heard the term ‘gamma’ bandied about in reference to computer displays, possibly along with the assertion that the Mac’s gamma setting is 1.8 and the average PC’s gamma is 2.2. So what on earth is this gamma thing, then? Well, just read on. You may wish you'd never asked!
Gamma refers to the response of CRT (cathode ray tube) displays to input voltage, or what’s displayed when they are fed a monitor signal. These electron gun-driven devices don't produce a light intensity (effectively the brightness) which is proportional to the input voltage. This means that different input levels aren't recreated entirely accurately without correction.
The intensity of light reproduced by a CRT display is described, technically, as being ‘proportional to the input voltage raised to the power gamma’, or ‘the exponent of the response to power input’. Tutorial 3 - Page 1. Tone and colour correction within Photoshop can leave many new/novice users confused, not least because of the vast array of tools but also the less than intuitive way in which some operate. This tutorial explains the basic tools and should also clear up some other mysteries along the way. This version of the Basic Tone and Colour Correction tutorial has been revised to reflect the changes introduced with Photoshop 7. It has also been expanded to include comprehensive discussions on the following Adjustment tools. Brightness/Contrast Colour Balance Levels Curves Eyedroppers Before starting any serious work in Photoshop it important that we have the monitor calibrated and have Photoshop correctly configured, see the Photoshop CS & Colour Management essay.
It's also quite helpful to have the desktop arranged in a way that allows both the "Channels", "Layers" and "Histogram" palettes to be viewed at the same time. Photoshop Histogram Increased Contrast 4.
Inside Pixar’s Leadership. ClubCompy » Kids [heart] computers! Focal Length and Aperture Explained for the Photography Novice. Focal Length The focal length of a lens determines its angle of view, and also how much the subject will be magnified for a given photographic position. Focal length also determines the perspective of an image. Longer focal lengths require shorter exposure times to minimize burring caused by the shake of hands. The Focal Length means how much can your camera see. Aperture The aperture range of a lens refers to the amount of light that the diaphragm can let inside the camera to reach the sensor. Apertures are listed in terms of f-numbers (expresses the diameter of the entrance pupil in terms of the effective focal length of the lens; It is the quantitative measure of lens speed), which are marked on the lens.
Lenses with larger apertures are faster because, for a given ISO speed, the shutter speed can be made faster for the same exposure. Minimum apertures for lenses are almost as important as maximum apertures. To get the ebook, click here!
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