Adobe 65089063 Training Guide - Page 33

For teaching opportunities, look for those dialog box options, menu commands, tool settings, and background concepts in each exercise that are not specifically covered. Questions 1 What does the abbreviation DNG stand for? 2 Why are histograms so useful? 3 In image correction, what do the terms Temperature and Tint refer to? Answers 1 DNG stands for Digital Negative format, a royalty free raw image format which has been designed by Adobe Systems to address the lack of an open standard for the raw files created by different cameras. Since its introduction in 2004 all Adobe photo manipulation software supports DNG. 2 The graphed curve of the histogram enables you to view the distribution of the number of pixels at each level of brightness in an image. At a glance you can see whether an image contains enough detail in the shadows (represented at the left end of the curve), midtones (in the center), and highlights (at the right of the histogram), and then correct the image accordingly. 3 Temperature refers to a shift between cooler and warmer colors-from blue to red-while Tint refers to a shift between green and magenta. ADOBE PHOTOSHOP ELEMENTS 9 CLASSROOM IN A BOOK 33