Oh, and if you are working in Photoshop or Lightroom, An image of an 18% gray card should reveal a histogram with one pixel width in the very center of the histogram. It will render brighter than it should truly appear. The same situation applies if there is a very dark or black tone you are using for a spot reading. Keep in mind that a spot reading off of a white bridal gown will render an exposure that is too dark a because the meter will try to make it read middle gray. In other words, this mid tone is the only tone value there is where you can use an incident meter reading from a hand-held incident meter (to measure light falling on or striking your subject) OR a reflective spot meter reading (designed to yield a brightness relative to 18% gray) and get the same reading with either meter. Interestingly enough, 18% gray cards will reflect the equal amount of light that they receive. 18% gray cards have been used for decades as a tool onto which photographers could aim a spot meter and use the brightness as the exposure of the scene. 18 Gray ebook Task Force Iota By Anne Tenino Read a Sample Format ebook ISBN 9781613720783 Series Task Force Iota Author Anne Tenino Publisher Dreamspinner Press Release 01 August 2011 Subjects Fiction Romance Science Fiction Find this title in Libby, the library reading app by OverDrive.
0 Comments
Leave a Reply. |