Impact of JPEG-WebP conversion on the characteristics of the photographic image

Mile Matijević ,Miroslav Mikota ,Marko Čačić

doi:10.17559/tv-20141208110946

Mile Matijević , Miroslav Mikota + Show 1 more

Open Access

https://doi.org/10.17559/tv-20141208110946

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Abstract

JPG is the most common format in digital photography today. In 2010 Google introduced WebP as the new optimal format for presenting photographs in the web environment, and the conversion of JPEG to WebP in Gmail, Picasa and Chrome services from 2013 is automatic and no more optional. Changes in colours and drawing sharpness of the image that occur in the JPEG - WebP conversion are analysed in the paper. The results point out changes in colours and the drawing sharpness of the image which are the outcomes of the JPG - WebP conversion and which can affect the technical, semantic and syntactic features of the photographs.

Highlights

Digital photographic images can be recorded in different formats
Tab. 2 shows the L, a and b colour values of X-Rite colour table stored in the JPEG format, converted into WebP format and ΔE00 colour differences
The results suggest the influence of JPEG format conversion, as the original, in the WebP format using the converter which uses the default settings of imagewebp () function in the chromatic and achromatic colours and sharpness of drawing as the basic indicators of preserving the image information in the conversion

Summary

Introduction

Digital photographic images can be recorded in different formats. Among those formats in the shooting area with the RAW file formats, JPEG (an acronym for Joint Photographic Experts Group) format established itself as the standard used which is in other phases of the digital photographic systems as well as in the viewing photographs in a web environment [1]. JPEG compression has emerged as the standard solution as it offers an efficient compression of image files. The method of compression loses specific details of recorded photographs, some changes remain invisible to the human eye and JPEG compression allows determination of the level of compression, or the quality control of the track [2]. In 2010 Google introduces new format designed for the pixel graphics, including photos, in the web environment, which is called WebP. The significance of this problem can be approximated by the fact that today 65 % of the content of websites make the image contents [3, 4]

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