1 / 10

1. What is dynamic range?

Week 13 Quiz. 1. What is dynamic range? 2. If one camera “captures a smaller dynamic range” than another camera, and they both took a picture of the same scene, how would their images differ? 3. A histogram is a graph of all the pixels in the image, based on what? (what’s the x-axis?)

taji
Download Presentation

1. What is dynamic range?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Week 13 Quiz 1. What is dynamic range? 2. If one camera “captures a smaller dynamic range” than another camera, and they both took a picture of the same scene, how would their images differ? 3. A histogram is a graph of all the pixels in the image, based on what? (what’s the x-axis?) 4. If an image has “low contrast”, its histogram would have pixels: Bunched up towards the middle Bunched up towards the sides Distributed evenly 5. For question 4, why? (what does a histogram with pixels in the middle, sides, or distributed evenly tell you?)

  2. ? Crushed shadows

  3. ? Blown highlights

  4. Not all “crushed shadows” are actually black

  5. Transformation: Pixel value x 10 As long as pixels aren’t clipped to pure black (or white), detail still exists

  6. Real-world examples Tools Exposure adjustment -Levels -Curves Better Tools Selective shadow/highlight adjustment High Dynamic Range (HDR) blending

  7. Important side effect Raising shadows reveals noise!

  8. RAW Headroom Original JPEG -4EV adjustment in ACR RAW format gives extra dynamic range headroom to restore crushed shadows and blown highlights RAW -4EV adjustment in ACR

  9. Fill Flash Shadows adjustment Original Fill flash Low-power flash can “fill in” shadows Better tones, less noise than shadows adjustment

  10. Shadows and Highlights Dynamic Range Larger photowells allow a larger dynamic range to be captured Larger sensors with less pixels => larger photowells

More Related