关于数码摄影色彩与成像技术环节影响的研究

传统胶片摄影方式下影像色彩的调整是非常困难的,需要用复杂的暗房技术,而且效果难以保障,随着数码技术进入摄影领域,摄影在技术上发生了一场深刻的变革,几乎所有的摄影工作都可以运用数码方式进行,而且效果可控性远远大于传统胶片摄影。这使得运用数字化的拍摄方式获得影像具有了很大的技术优势,尤其影像色彩的调整,技巧和调整方式都大大进步了。本文主要针对数码摄影中影像色彩的调整技术及其应用,以及色彩和照片艺术表现效果的关系进行阐述,数码摄影中色彩处理的相关技术和色彩与成像艺术效果之间的关系。     

数码摄影在儿童医学摄影中的应用

随着数码摄影技术的普及,医学摄影在医疗、科研、教学工作中的应用日益广泛,越来越显示了其重要性,儿童医学摄影作为医学摄影领域中的一个分支,在医学科研工作,教学及临床病例积累方面,不同于其他医学摄影而独立存在,特别是儿童具有其典型的活泼好动的特点,因此它具有较强的医学专业性、特殊性、瞬间性和高度的纪实性。了解数码摄影基本知识,掌握儿童心理特点,才能完成好儿童医学摄影。     

《影像视觉》数码摄影俱乐部系列讲座

越来越多的读者喜欢在夏天拍摄花朵了,可是如何才能拍摄出好的花朵摄影佳作呢？《影像视觉》的编辑们,为了解决广大影友的疑问,在位于北京佳能交流空间举办了一场关于花卉摄影的讲座。     

数码摄影在口腔医学中的应用及注意事项

口腔医学图片经常应用在医疗、教学、科研以及学术交流活动中,而图片质量的好坏与摄影器材、摄影的技术和拍摄方法关系十分密切。在口腔医学数码摄影拍摄过程中,除了注重平时摄影的拍摄技巧外,还应注意口腔医学摄影的独特性,如患者的配合程度、感染控制情况等。只要我们选择好合适的摄影器材,掌握照相机的使用和拍摄的基本方法,与患者交流沟通,就能够拍摄出高质量的口腔医学图片。     

数码摄影必备滤镜

每一位摄影师都应该准备一套滤镜,这能让你在拍摄中更好地适应外界的光线变化。在这一页里,我们将带你挑选一套最值得拥有的滤镜。1高坚H250A中灰渐变镜www.cokin.com.cn高坚这套中灰密度镜分为三块方形滤镜,每块的压暗效果不同,可以在天空和地面曝光不同时调节光比。这套滤镜分为P121L（压暗一挡）、P121M（压暗两挡）和P121S（压暗三挡）三块滤镜。     

强化摄影作品的色彩和细节

我们将用实例告诉大家如何发掘画面的纹理与色彩潜力,增强作品的视觉冲击力。在无风的日子里进行风光摄影创作,水面就像一面镜子,能给我们带来完美的对称构图。但景物在经过水面反射以后,其通透程度和色彩表现力往往逊色于画面中的实体,破坏了画面的亮度平衡。想改善这类风光摄影作品的画面表现力,首先要做的就是对反射部分进行分区调整,增强该区域的色彩、反差与细节表现。幸好Pnotoshop为我们提供了功能强大的调整图层与图层蒙版。在它们的帮助下,这项     

改善照片 从色彩开始——这里有你需要的、关于摄影的一切建议

一张不错的照片和一张出色的照片有什么分别？什么元素能组成绝佳的构图？如果你需要一些建议为日常的拍摄注入情趣，我们的专家会给你提供满意的答案。他们正在这儿等着你!这里就是你获取照片点评和得到实用建议的地方。     

数码医学摄影与传统医学摄影的区别

数码技术的发展,带动整个摄影领域变革。我们要以新的姿态、新的观念、新的思维方式,掌握数码科学技术,迎接新时期的挑战。     

大讲堂：强化摄影作品的色彩和细节

我们将用实例告诉大家如何发掘画面的纹理与色彩潜力,增强作品的视觉冲击力。     

Feasibility of using digital color imaging devices for the determination of cationic dyes compatibility

In the present research, the compatibility of dyes was evaluated using a scanner by the application of the method proposed by Khalili and Amirshahi, which had been proved as a novel and accurate method for evaluating the compatibility behavior of dye mixtures. A dip‐test method was employed to dye samples, compatibility panels, in binary combinations of cationic dyes on acrylic fibers. In order to use the scanner, first the device was colorimetrically characterized using a regression technique. The tristimulus values obtained from the scanner were, then, used for the reconstruction of the reflectance of the compatibility panels by principal component analysis. Next, the reconstructed reflectance of the panels were transferred to the corresponding K/S spectra and the Khalili and Amirshahi proposed method applied to the spectra in order to obtain the percentage variance (PV), which is the criterion of the dye compatibility. The comparison between the PVs obtained from the scanner and the corresponding one calculated by the spectrophotometrically measured reflectance of the compatibility panels showed a very significant correlation of the compatibility results regarding Pearson correlation coefficients and their K values. It was concluded that due to the smoothness of the reconstructed spectra and the performance of the PCA method of the reconstruction, which manifest itself in the good spectral reconstruction, the scanner method joined with the Khalili and Amirshahi proposed method can reliably be used for the determination of dye mixtures compatibility by a dip test. © 2016 Wiley Periodicals, Inc. Col Res Appl, 42, 337–345, 2017     

Assessing color performance of whole‐slide imaging scanners for digital pathology

The color performance of two commercial whole‐slide imaging (WSI) scanners was compared against the ground truth and a hypothetical monochrome scanner. Three biological tissue slides were used to test the WSI scanners. A multispectral imaging system was developed to obtain the color truth of the biological tissue slides at the pixel level. The hypothetical monochrome scanner was derived from the color truth as a lower bound for comparison. The CIEDE2000 formula was used to measure color errors. Results show that color errors generated by the modern commercial WSI scanner, the legacy commercial WSI scanner, and the monochrome WSI scanner are in the range of [8.4, 13.0], [18.0, 26.33], and [17.4, 17.6] ΔE₀₀, respectively. The legacy commercial WSI scanner was outperformed by not only the modern commercial WSI scanner but also by the hypothetical monochrome scanner.     

中国山水画对粉彩雪景山水的影响

绘画在陶瓷上的装饰自古就有,陶瓷彩绘工艺的形成历史悠久。早在商代就开始发明了原始的瓷器,有了原始瓷器,相应的瓷上装饰也就应运而生。陶瓷与绘画的关系就如同阮生姊妹而血脉相通,同根植于民族文化的沃土之中。在古代,绘画与工艺美术本是一体,后来,随着社会的发展,绘画才从工艺美术的范畴中分离出来,成为一门独立的,纯粹的艺术。尽管这样,她们之间的关系仍然是相互影响、相互渗透、相互借鉴、相     

Monitoring of degradation of porous silicon photonic crystals using digital photography

We report the monitoring of porous silicon (pSi) degradation in aqueous solutions using a consumer-grade digital camera. To facilitate optical monitoring, the pSi samples were prepared as one-dimensional photonic crystals (rugate filters) by electrochemical etching of highly doped p-type Si wafers using a periodic etch waveform. Two pSi formulations, representing chemistries relevant for self-reporting drug delivery applications, were tested: freshly etched pSi (fpSi) and fpSi coated with the biodegradable polymer chitosan (pSi-ch). Accelerated degradation of the samples in an ethanol-containing pH 10 aqueous basic buffer was monitored in situ by digital imaging with a consumer-grade digital camera with simultaneous optical reflectance spectrophotometric point measurements. As the nanostructured porous silicon matrix dissolved, a hypsochromic shift in the wavelength of the rugate reflectance peak resulted in visible color changes from red to green. While the H coordinate in the hue, saturation, and value (HSV) color space calculated using the as-acquired photographs was a good monitor of degradation at short times (t < 100 min), it was not a useful monitor of sample degradation at longer times since it was influenced by reflections of the broad spectral output of the lamp as well as from the narrow rugate reflectance band. A monotonic relationship was observed between the wavelength of the rugate reflectance peak and an H parameter value calculated from the average red-green-blue (RGB) values of each image by first independently normalizing each channel (R, G, and B) using their maximum and minimum value over the time course of the degradation process. Spectrophotometric measurements and digital image analysis using this H parameter gave consistent relative stabilities of the samples as fpSi > pSi-ch.     

Experimental study of particle rotation characteristics with high-speed digital imaging system

Particle rotation plays an important role on several aspects in gas-solid two-phase flow. However, it has not been paid much attention due to a lack of appropriate measurement methods. An attempt has been made in the present paper on the experimental study of particle rotation characteristics in a cold pilot-scale Circulating Fluidized Bed (CFB) riser, by using a high-speed digital imaging measurement system. It is found that one can measure rotation speeds manually for particles with special speckles on their surfaces or irregular shapes by observing particle image sequences. A dual-frequency imaging method was presented to enlarge the maximal measurable rotation speed at finite frame frequency and the measured rotation speeds are validated theoretically. Furthermore, particle rotation characteristics in a cross-section in upper dilute-phase zone were analyzed statistically. The results show that the average particle rotation speed is about 300 rev/s with the top speed of 2000 rev/s, when the superficial gas velocity U_g, external solids mass flux G_s and average particle diameter are 5 m/s, 1.5 kg/(m² s) and 0.5 mm, separately. The average particle rotation speed near the wall area is higher than that in the center area at the testing cross-section. Those particles, with either smaller size or higher radial component of translational speed, may have higher average rotation speed. The average rotation speed of irregular particles is apparently higher than that of the spherical ones.     

Formulation of interior design color palette based on the regression analysis of digital color samples

Various color models have been developed to represent color as a synthetic construct of its component attributes. The CMYK color model is based on a mathematical framework efficient for digitally planning and processing the colors for a domain‐specific application such as interior design. The CMYK color model correlated with the Munsell system would also increase usability and effectiveness. In this research, we suggest a computationally assisted systematic method to formulate a color palette useful for interior design. A continuous process of sampling, statistical analysis, and computational manipulations has been performed to derive a desirable color palette. First, color samples have been extracted from the representative interior design cases of residential buildings, offices, and commercial spaces. Second, the interrelationships among C, M, Y, and K values in all samples have been statistically analyzed followed by calculating the number of elements in the numerically categorized sets for C, M, or K value. New CMYK combinations were generated by using selected sets of C, M, or K value showing relatively dominant presence in the original samples. Then, the statistically extracted correlation function was used to propose a complete list of CMYK color combinations for interior design. The resulting CMYK combinations were then converted into the values represented in the Munsell color system. We envision that the proposed approach can increase both applicability and efficiency of the resulting color palette by considering both intuitive and mathematical color models with the support of a computational data processing technique. © 2005 Wiley Periodicals, Inc. Col Res Appl, 30, 135–145, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/col.20092     

Considering the surround in device-independent color imaging

When viewing images, the relative luminance of the surround has a profound impact on the apparent contrast of the image. For this reason, photographic transparencies intended for projection in a darkened room are produced with an objective contrast substantially higher than that necessary for optimum reproduction as prints viewed in an illuminated surround. the dark surround causes the image elements to appear lighter and this effect is stronger for darker colors resulting in a loss in perceived contrast. This effect is also of great importance in deviceindependent color imaging since resultant images might be observed in a wide variety of media and viewing conditions. Research on psychophysical scaling of brightness and lightness and the effects of background and surround relative luminance on lightness and chroma is reviewed. the importance of this research for device-independent color imaging systems is described along with the prediction of these effects using the RLAB color-appearance model. Finally, experiments testing the use of RLAB and other color-appearance models in cross-media color reproduction applications are described.