An example of TZS applied to digital. It took me some time to discover how to apply it to digital. After that, some lab work and we were off. It turns out to be a bit more precise than the adage "expose to the right".
To do this requires one to do structured testing of their camera. A practice some find difficult to approach with enthusiasm. Additionally, I found it's not a one size fits all. Each digital camera needs to be tested and note the exposure adjustments effect of that particular camera.
dpullum wrote:
Works for color, but for BW, it analyzes the shade of gray into zones as in the Ansel Adams zone system. I worked with it years ago. This year it was resurrected by open-source org...
The Zone System is a photographic technique for determining optimal film exposure and development, formulated by Ansel Adams and Fred Archer in 1941. Many man-hours in the darkroom for Ansel Adams's landscapes made him forever famous; few shared his passion and patience.
The 11 zones in Ansel Adams’ system were defined to represent the gradation of all the different tonal values you would see in a black and white print, with zone 5 being middle gray, zone 0 being pure black (with no detail), and zone 10 being pure white (with no detail). Theoretically, each zone represents one f-stop in exposure. You’ll also notice there is then an 11-stop difference between pure black and pure white, with a 7-stop difference between the darkest black with detail and the lightest white with detail."
Wikipedia reports that "In mid-September, 2011, the Light Crafts website went offline without notice. It was reported that Fabio Riccardi, founder of Light Crafts and the primary developer of LightZone, was now working as an Apple.
Good News the zone system was reborn This is especially useful for IR with 720+ nm filter that yields BW images as well as those who love B&W photography. I had it years ago and I started a search... Photoshop has it version that only works in Photoshop. That prompted me to search, I found my old copy in my programs and that gave some direction but I encountered many dead ends until success... I found it and the free download.
"A zone preview at the top of the column divides the image into zones corresponding to these shades of gray. You can use the Zone Mapper to stretch or compress individual tonal ranges, and you will see the changes reflected in both the Zones preview and the image. [Isolates particular zones, shades, as I recall and leaves other zones alone]
By default, the settings are applied to your image globally, but there is also the Regions tool, which allows you to isolate areas of the image and apply corrections only to them. You can draw areas in the form of polygons, splines or Bezier curves."
Works for color, but for BW, it analyzes the shade... (
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