GB/T 18721.5-2024 English PDFUS$1014.00 · In stock
Delivery: <= 7 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 18721.5-2024: Graphic technology - Prepress digital data exchange - Part 5: Scene-referred standard colour image data(RIMM/SCID) Status: Valid
Basic dataStandard ID: GB/T 18721.5-2024 (GB/T18721.5-2024)Description (Translated English): Graphic technology - Prepress digital data exchange - Part 5: Scene-referred standard colour image data(RIMM/SCID) Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: A17 Classification of International Standard: 37.100.99 Word Count Estimation: 50,597 Date of Issue: 2024-03-15 Date of Implementation: 2024-03-15 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 18721.5-2024: Graphic technology - Prepress digital data exchange - Part 5: Scene-referred standard colour image data(RIMM/SCID)---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. ICS 37.100.99 CCSA17 National Standards of People's Republic of China Printing Technology Prepress Data Exchange Part 5.Scene-related standard colors Image data (RIMM/SCID) (ISO 12640-5.2013, IDT) Released on 2024-03-15 2024-03-15 implementation State Administration for Market Regulation The National Standardization Administration issued Table of ContentsPreface I Introduction II 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Data Description 3 4.1 Overview 3 4.2 Dataset Definition 4 4.3 Image Data Arrangement 4 4.4 Data color coding 4 4.5 Natural Images 5 4.5.1 Description 5 4.5.2 Mapping 15 4.6 Synthetic Image 16 4.6.1 Description 16 4.6.2 Color Table 1 17 4.6.3 Color Table 2 18 4.6.4 Color gradient image 18 5 Electronic data19 Appendix A (Normative) Guidelines for the use of digital data 22 Appendix B (Normative) Checksum Data 23 Appendix C (informative) Typical TIFF/IT file header for image files 25 Appendix D (Informative) Label Text Insertion 27 Appendix E (Informative) Histogram and Color Gamut Diagram 29 Reference 45ForewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document is part 5 of GB/T 18721 "Printing Technology Prepress Data Exchange". GB/T 18721 has published the following part. --- Part 1.CMYK standard color image data (CMYK/SCID); --- Part 2.Standard color image data based on XYZ/sRGB encoding (XYZ/SCID); --- Part 3.CIELAB standard color image data (CIELAB/SCID); --- Part 4.Wide color gamut standard color image data for display [AdobeRGB (1998)/SCID]; --- Part 5.Scene-related standard colour image data (RIMM/SCID). This document is equivalent to ISO 12640-5.2013 "Printing technology prepress data exchange Part 5.Scene-related standard color map Image Data (RIMM/SCID)". Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is submitted by the State Administration of Press and Publication. This document is under the jurisdiction of the National Printing Standardization Technical Committee (SAC/TC170). This document was drafted by. Shenzhen Polytechnic, Anhui Xinhua Printing Co., Ltd., Dongguan Polytechnic, Suzhou Tongli Printing Brush Technology Co., Ltd., Shenzhen Ziguang Puyinjia Graphic System Co., Ltd., Tianling Precision Platemaking (Shenzhen) Co., Ltd., Zhejiang Puqi Digital Technology Co., Ltd., Shenzhen Printing Industry Association, South China University of Technology, Huiyuan Printing and Packaging Technology (Tianjin) Co., Ltd., Liaocheng Municipal Product Quality Supervision and Inspection Institute, Guangdong Xingyi Digital Printing Co., Ltd., Shenzhen Yinzhi Internet Information Technology Co., Ltd., Jiangnan University, Hangzhou University of Electronic Science and Technology. The main drafters of this document are. Chen Chen, Nie Zhe, Zhang Yanfen, Du Wanquan, Wang Xiaochun, Huang Qinghua, Gong Rongrong, Cheng Jianwen, Xu Yongqiang, Li Yonglin, Wang Lijie, Liu Xia, Hu Jingyu, Yin Lihua, Huang Zhen, Shen Lin, Wang Mengmeng, Wang Qiang, Zhang Xuliang, Chen Xiulan, Yang Siyu, Shuai Kefan, Hu Guimian, Cui Yong, Li Xiaodong.Introduction0.1 The need for standard digital test images The standard test images provide a set of data that can be used for any of the following tasks. --- Evaluate the color reproduction of the imaging system; --- Evaluate color image output devices; --- Evaluate the effectiveness of image processing algorithms applied to images; ---Evaluate the coding technologies required for storing and transmitting high-definition image data, etc. As a standard well-defined dataset containing high-definition images with typical common image contents, standard test images can make users confident that If the mapping is done properly, the image will produce a high-quality replica and provide a reasonable test of the evaluation task. Any system, but the image set provided in this document can be expected to obtain reasonable testing with a limited image set. In addition, the existence of a standard set makes it possible to Users in the same region can compare images without exchanging images before copying. However, different applications require standard image data to use different image encodings in different image states (see ISO 22028-1). The user needs to select the encoded image data that is suitable for the evaluation task. Although it is always possible to transform the image data into another image state, Generally speaking, there is no consensus among experts on how to best accomplish this task. Therefore, in the various parts of GB/T 18721, Considering providing data for different image states, Figure 1 shows the relationship between image states and the applicable parts of GB/T 18721. Figure 1 Relationship between image states GB/T 18721 "Printing Technology Prepress Data Exchange" is divided into 5 parts. --- Part 1.CMYK standard color image data; --- Part 2.Standard color image data based on XYZ/sRGB encoding (XYZ/SCID); --- Part 3.CIELAB standard color image data (CIELAB/SCID); --- Part 4.Wide color gamut standard color image data for display [AdobeRGB (1998)/SCID]; --- Part 5.Scene-related standard colour image data (RIMM/SCID). GB/T 18721.1 provides a set of 8-bit data per channel defined by CMYK dot percentage. The colors are strictly defined only when printing, so these data are only suitable for evaluation of CMYK printing applications. In fact, because in traditional printing applications, these image data are defined in the use of "Typical" ink systems and "typical" tone value mappings produce "satisfactory" images, while CMYK printing differs from this. Printing systems that use inks of significantly different colors or produce very different tonal value mappings may not be useful without clear Without a defined color conversion, the data cannot be reproduced as a satisfactory image. Furthermore, with a bit depth of only 8 bits per channel, any Any color changes may be affected by human intervention. GB/T 18721.2 provides a set of test image data, which are encoded with XYZ values ranging from 0 to 65535 per channel, and Encoded in sRGB (defined in IEC 61966-2-1) with a bit depth of 8 bits per channel. (Due to the perceptual non-uniformity of linear color spaces The two sets of data are the same for the reference sRGB viewing environment and the reference sRGB CRT display. The images are optimized and the XYZ tristimulus values are calculated relative to the CIE standard illuminant D65 before scaling. A system that uses sRGB as a reference encoding and is therefore primarily suitable for the consumer market and for those devices that use color displays as "distributed" Although these systems have some applications in the printing industry, sRGB is definitely not the most common image encoding. A significant disadvantage is that the shape of the sRGB color gamut is very different from the typical offset color gamut. This difference may require more vivid colors to be re-colored. Mapping is done to produce the best printing results for sRGB image data. GB/T 18721.3 provides a set of test image data for a wide color gamut of reflective media, using D50 illumination. The depth is 16 bits per channel, while the color table and gradient map are 8 bits per channel. In applications where the output color gamut plays a role, it is considered desirable to generate an image set that allows the entire color range close to the surface color gamut boundary to be In addition, from the perspective of color management, if the image uses D50, the main reference illuminant in printing and photography, the image It is also the primary reference illuminant for most color management applications. GB/T 18721.4 provides a set of wide color gamut test image data encoded as AdobeRGB with a bit depth of 16 bits per channel. These data are optimized for viewing under the AdobeRGB reference viewing environment and on an AdobeRGB reference monitor. RGB (1998) color image encoding specification]. These images are designed primarily for use with systems that use AdobeRGB as the reference encoding. This workflow is mainly suitable for the professional market and systems where wide color gamut color monitors are "distributed" devices. AdobeRGB is very popular among photographers and is increasingly used in printing technology. Closer to the typical offset printing gamut. Although this difference may require color remapping between AdobeRGB images and sRGB images, AdobeRGB -encoded images usually require less vivid color remapping when printed than sRGB -encoded images. Therefore, the purpose of GB/T 18721.4 is to provide a test image dataset with a larger color gamut than sRGB, which is consistent with the AdobeRGB wide color gamut. The bit depth of natural and synthetic images is 16 bits per channel. Possible wide gamut color encoding options include AdobeRGB, opRGB (IEC 61966-2-5), and ROMM RGB. (ISO 22028-2). We hope to perfectly map the image on a well-defined large color gamut reference display through GB/T 18721.4. It prefers AdobeRGB over the other two options. Since opRGB 's color mapping is somewhat fuzzy, it is not very useful in output. The surface is not clear enough, so the reference medium and viewing conditions are slightly different. ROMM RGB (ISO 22028-2) is clear in output However, the reference medium is a virtual reflective print (ICC-perceived reference medium). Therefore, the image status is the same as GB/T 18721.3. This document (GB/T 18721.5) provides a set of scene-related test image data encoded as RIMM RGB with a bit depth of 16 These data are obtained by capturing natural scenes with various digital cameras and converting the captured camera's original RGB signals into field data. The accuracy of these estimates is affected by several factors, including the fact that the camera’s spectral sensitivity is close to the color matching function of the human visual system. The degree of accuracy of the image quality, the adequacy of the conversion from the camera's raw RGB signal to the colorimetric estimate, optical effects such as off-axis signal attenuation, aberrations, and glare, and noise in the camera signal. The transform used to obtain the chromaticity estimate is a general transform that is not optimized for the spectral characteristics of each scene. Therefore, in some cases, the color estimation may be significantly biased. The image state of these data is scene-dependent because no The only processing of this data is based on visual evaluation. This is done by applying gain to the camera channels individually to achieve the desired white balance, converting to scene-dependent, and then The overall gain is then adjusted in a linear, scene-dependent workspace, using the Color mapping transforms the example to view the image. For aesthetic reasons, a different white balance may be desirable in some cases. If the color mapping transformation is different, a different overall gain may be required. The images provided in this document are mainly suitable for evaluating the color of different output media. Color mapping. 0.2 Characteristics of test images The performance of any color reproduction system is usually measured both subjectively (by observing the final output image) and objectively (by measuring the control elements). The requirement stipulates that the test images include natural scenes (pictures) and synthetic images (color charts and color gradient maps). The results of image evaluation are greatly affected by the image content, so it is very important to ensure that natural images are of high quality and contain a variety of subjects. However, it is difficult to generate natural scene elements containing the slight color variations required for test images in a single, relatively small sample set, as well as The full color range of real scenes. Therefore, synthetic color charts are also included. These color tables are encoded with integer RIMMRGB and spectral The limitation of the spectral locus (applicable to the region where the RIMMRGB encoding extends outside the spectral locus). In the future, it is proposed to develop a second set of integer RIMM-RGB encoding restricted floating point RIMM/SCID. To obtain these images, a survey of all ISO /TC130 (Printing Technology) member countries was conducted to determine the ideal image The resulting image set consists of 44 natural images, 2 color tables, and a series of color gradient images. Natural images include skin tones, hair, foliage, water, skies, flowers, and other memory colors in a wide range of dynamic range scenes. 0.3 File formats for digital test images All images are composed of alternating pixel data (first R, then G, then B), with the origin of the data located at the upper left corner of the image. The data is included in this document as a separate file. The image file format is in accordance with ISO 12639 (TIFF/IT) A RIMMRGB ICC profile that complies with ISO 15076-1 is embedded in each image file. As needed, images can be imported and manipulated through various image processing software tools and platforms commonly used in the industry (for TIFF files, See Appendix C for details on the header and RIMMRGB ICC profile. Printing Technology Prepress Data Exchange Part 5.Scene-related standard colors Image data (RIMM/SCID) Important note. The electronic version of this document contains color information that is helpful for the correct understanding of this document. Therefore, users should consider using Print this document using a color printer. If you want to print in non-color, you can refer to the electronic version of this document.1 ScopeThis document specifies a set of standard scene-related color images (encoded as 16-bit RIMMRGB digital data) for evaluating The conversion of scene-related image state to output-related image state (color mapping conversion). This document is applicable to digital cameras, camera raw processing software, color management systems, color profiles, and output devices (such as Research on testing and evaluating color mapping conversion in systems such as displays and printers.2 Normative referencesThe contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 22113-2008 Printing technology Prepress digital data exchange Label image file format for image technology (TIFF/IT)(ISO 12639.2004,IDT) ISO /T S22028-3.2012 Photography and printing technology - Extended color coding for digital image storage, manipulation and exchange Part 33 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Additive RGB color space additiveRGB colourspace The chromaticity color space consists of three primary colors (usually red, green and blue), whose CIEXYZ tristimulus values can be obtained by The weighted combination of the CIEXYZ tristimulus values of the primary colors is determined by the values in the RGB color space, corresponding to the three primary color weights and the radiation linear color of the primary colors. Proportional to the space value. Note 1.In additive RGB color space, a simple 3×3 linear transformation can be used between CIEXYZ tristimulus values and radiometric linear color space values. conversion. Note 2.The additive RGB color space is a set of CIE tristimulus values of the additive RGB primary colors and the white point of the color space, as well as the color component transfer function To be defined. [Source. ISO 22028-1.2004, 3.3] ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 18721.5-2024_English be delivered?Answer: Upon your order, we will start to translate GB/T 18721.5-2024_English as soon as possible, and keep you informed of the progress. The lead time is typically 4 ~ 7 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 18721.5-2024_English with my colleagues?Answer: Yes. 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