Method and system for auto-enhancing photographs with shadow lift adjustments

摘要

Some embodiments of the image editing and organizing application described herein provide an automatic enhancement process that includes a shadow lift adjustment. The process takes an input image and enhances the contrast of darker parts of the image. The process uses a structure histogram to determine an amount of shadow lift adjustment to apply to the image. The process tempers this adjustment based on an International Organization for Standardization (ISO) value of the image.

主权项

1. A method of automatically adjusting shadow levels of an image, the method comprising:
generating a set of histograms that identify different characteristics of the image, wherein the set of histograms comprises a structure histogram comprising values based on relationships between each particular pixel of a plurality of pixels in the image and the neighboring pixels of the particular pixel; determining a shadow lift setting level based on a set of statistics calculated for the set of histograms; and applying a shadow lift at the determined shadow lift setting level to the image, wherein the generating, determining and applying are performed by an electronic device.