Digital image four-dimension conversion method

Abstract

The invention particularly relates to a digital image four-dimension conversion method and belongs to the field of digital image processing. The method includes the steps of creating a conversion relationship according to conversion target characteristic files, creating an image conversion data correspondence table according to the conversion relationship, carrying out color classification and color conversion on the image conversion data correspondence table, and carrying out matching on conversion digital image files on the converted image conversion data correspondence table. Compared with the prior art, the digital image four-dimension conversion method has the advantages that an intermediate junction color space does not need to be passed through due to the color matching mode that a source color space is directly converted to a target color space, image information losses are avoided in the color conversion process, and a more ideal recovery capacity is provided; color space conversion and color mode conversion are carried out on images in batches by means of the data correspondence table, converted images are saved in the same folder, relative independence of data is ensured, convenience and rapidness are achieved, and the chance of errors caused by manual processing in the preprinting process is reduced.

Description

technical field [0001] The invention specifically relates to a four-dimensional conversion method for digital images, which belongs to the technical field of digital printing. Background technique [0002] Currently, the commonly used image conversion method in the market is to perform color separation and color conversion between related color spaces through Photoshop. The basic principle of Photoshop conversion is a working method from CMYK space to Lab space and then to CMYK space through ICC characteristic files, from CMYK four-dimensional color space to Lab three-dimensional color space, and then to CMYK four-dimensional color space. Four mapping methods, such as relative value, absolute value, saturation, and vision, can be used during conversion. [0003] However, the traditional ICC color profile conversion method uses an intermediate connection color space (PCS) as a bridge to convert between the two spaces. This method has the following limitations: [0004] From...

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Problems solved by technology

[0003] However, the traditional ICC color profile conversion method uses an intermediate connection color space (PCS) as a bridge to convert between the two spaces. This method has the following limitations:

[0004] Convert from the CMYK four-dimensional color space to the Lab three-dimensional color space and then convert to the CMYK four-dimensional color space. After two conversions, the color accuracy is greatly lost, and the accuracy is also affected to a certain extent.

[0005] In the same ICC input and output files, they are matched through a look-up table (LUT-Look up Table), with different black plate settings and more uncertainties, and the standard of color data information before and after image conversion cannot be guaranteed to be consistent The current ICC color characteristic file conversion method only has a color reproduction accuracy of about 90%;

[0006] In terms of color space conversion operations for large batches of images, it fails to meet the production needs of pursuing high efficiency and high quality

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