Method and apparatus for implementing black and white of color image

Abstract

The invention discloses a method for blackening and whitening a color image, which comprises the following steps: copying a first temporary image and a second temporary image from an original image; performing a brightening treatment on pixel points of which the gray value is in a corresponding range in the first temporary image according to a preset threshold value and a softening parameter value, and performing a darkening treatment on each pixel point in the second temporary image according to a preset brightness conversion list; using the first temporary image after the brightening treatment as a covering layer to perform image layer overlay on the original image and the second temporary image after the darkening treatment, and performing a gray scale treatment on an image obtained after the image layer overlay to obtain a gray scale image; copying a third temporary image from the gray scale image; and overlaying the gray scale image and the third temporary image by a method in a soft light mode to obtain a black and white image of the original image after the blackening and whitening. The invention discloses a device for blackening and whitening the color image simultaneously. The method and the device for blackening and whitening the color image can achieve batched and automated blackening and whitening treatment.

Description

technical field [0001] The invention relates to image processing technology, in particular to a method and device for black and white color image. Background technique [0002] Black-and-white image is a common form of photo. The traditional black-and-white image is an image obtained by presenting different levels of gray images on the negative film based on the principle that the sensitivity of the film coated with the film to the light intensity is different. form. Although color images have better color performance capabilities, they can more faithfully restore various details of the photographed image. However, black-and-white images remove the visual effects of various colors in color images through a single grayscale color, making it easier for image observers to fully focus on the composition and the contrast of light and shadow, making black-and-white images more visible. Good performance of light and shadow effects, so it is often more visually impactful than colo...

AI Technical Summary

Problems solved by technology

[0005] First of all, the operation and use of these software are relatively complicated, not only are there many steps, but also the parameters that need to be manually operated and adjusted are very complicated, users without certain basic knowledge of image processing cannot use it at all, and the versatility is not strong; Relying on the user to operate, although experienced users can complete the image black and white processing very well, but this processing method that requires too much human intervention obviously cannot meet the requirements of batch and automatic processing; finally, the application of these software Limited range - when the contrast of the color image itself is low, the black and white image obtained after black and white processing will be grayed out, not only will many details in the image be lost, but also the light and shadow effect that black and white photos should have can not be reflected

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