Thursday, May 31, 2007

Diane Arbus


Introduction


A pivotal figure in contemporary documentary photography, Diane Arbus produced a substantial body of work before her suicide in 1971. Her unrelentingly direct photographs of people who live on the edge of societal acceptance, as well as those photographs depicting supposedly "normal" people in a way that sharply outlines the cracks in their public masks, were controversial at the time of their creation and remain so today.

Arbus was born Diane Nemerox, to a wealthy family in New York City. Her father owned a fashionable Fifth Avenue department store. She was educated at the Ethical Culture School, a progressive institution. At age 18 she married Allan Arbus and began to express an interest in photography. Her father asked Diane and her husband to make advertising photographs for his store. The couple collaborated as photographers from then on, eventually producing fashion pictures for Harper's Bazaar.

Between 1955 and 1957 Arbus studied under Lisette Model. Model encouraged Arbus to concentrate on personal pictures and to further develop what Model recognized as a uniquely incisive documentary eye. Soon after Arbus began her studies with Lisette Model, she began to devote herself fully to documenting transvestites, twins, midgets, people on the streets and in their homes, and asylum inmates. Arbus's pictures are almost invariably confrontational: the subjects look directly at the camera and are sharply rendered, lit by direct flash or other frontal lighting. Her subjects appear to be perfectly willing, if not eager, to reveal themselves and their flaws to her lens.

She said of her pictures, "What I'm trying to describe is that it's impossible to get out of your skin into somebody else's.... That somebody else's tragedy is not the same as your own." And of her subjects who were physically unusual, she said, "Most people go through life dreading they'll have a traumatic experience. [These people] were born with their trauma. They've already passed their test in life. They're aristocrats."

Arbus's photographs drew immediate attention from the artistic community. She was awarded Guggenheim Fellowships in 1963 and 1966 to continue her work. In 1967 her work was mounted in the New Documents show at the Museum of Modern Art, New York, along with the work of two other influential, new photographers: Gary Winogrand and Lee Friedlander. For the most part, the exhibition received extremely good reviews.

In 1970 Arbus made a limited portfolio containing 10 photographs; by then she had established an international reputation as one of the pioneers of the "new" documentary style. Her work was often compared with that of August Sander, whose Men Without Masks expressed similar concerns, although in a seemingly less ruthless manner. In July 1971 Diane Arbus took her own life in Greenwich Village, New York. Her death brought even more attention to her name and photographs. In the following year Arbus became the first American photographer to be represented at the Venice Biennale. A major retrospective at the Museum of Modern Art, New York, in 1972, which traveled throughout the U.S. and Canada, was viewed by over 7.25 million people. The next year, a Japanese retrospective traveled through Western Europe and the Western Pacific. The 1972 Aperture monograph Diane Arbus, now in its twelfth edition, has sold more than 100,000 copies.




for more informations,pleast visit http://www.artphotogallery.org/02/artphotogallery/photographers/diane_arbus_01.html

Friday, May 11, 2007

Malmö - a city in transition

Malmö is the commercial centre of southern Sweden and an international city. This is expressed, not least, by the fact that Malmö has 270.000 residents who speak some 100 languages and belong to 164 different natiionaalitiyes


Malmö is also undergoing a transition from being an industrial city to a city of knowledge। Older industries have been replaced by investments in new technology and training programmes of high calibre। Malmö University, which opened in 1998, is Sweden's latest venture in the field of higher education, accommodating some 15.000 students.


The strongest sectors in Malmö are logistics, retail and wholesale trade, construction, and property। There are also a number of well-known companies within biotechnology and medical technology, environmental technology, IT, and digital media fields. Co-operation between colleges, science parks, and companies provides a sound basis for entrepreneurs and creative development in Malmö.


An exceptionally well developed infrastructure makes Malmö very easy to reach, whatever means of transport you use to get here: boat, plane, train or car। Malmö has an international harbour and the airports Kastrup and Sturup are only half an hour's journey from the centre of Malmö. The motorway reaches right into the city centre and Malmö has excellent rail connections with the rest of Sweden and Europe.


The City of Malmö is enhancing an attractive business environment and a dynamic business community in Malmö.

Thursday, April 5, 2007

VRay布光思路(转贴)

VRay布光思路
室内篇:
逐步增加灯光在场景中布光时,头脑中有一个清晰的工作方法是很有帮助的。我们一般采用逐步增加灯光的方法。通常在场景中布光时,从无灯光开始,然后逐步增加灯光,每次增加一盏灯。只有当场景中已存在的灯光已经调整到令人满意后才增加新的灯光。这样能够让我们能够清楚的了解每一盏灯对场景的作用,并能够避免场景中多余的灯光而导致不需要的效果和增加渲染时间。我通常从天光开始,然后增加阳光,最后才添加必须的辅助灯光。





准备工作:
1. 在计算光照贴图之前,隐藏所有的玻璃材质物体。这样不仅能让更多的光线通过,而且能够加快测试渲染的速度。
2. 设定渲染尺寸为400x300, 并且Image Sampler AA to Fixed: Subdiv=1.在这个早期阶段,我们需要快速渲染来看到结果,所以快速渲染可以用小的分辨率,也不需抗锯齿。
3. 在Advanced Irradiance Map Parameters>Mode卷展栏中, 确认Bucket mode 被选中. 此时渲染器被划分为许多区域或称之为 "buckets" 当计算完成之后每个区域都是可见的。 buckets的较好的尺寸是128x128像素. 我在工作时还经常改变Render Region Sequence渲染顺序, 这样我就能最先看到我所感兴趣的区域. 在最初的测试渲染中主要考虑的是到达后面墙壁的光线,所以我将区域渲染块的渲染顺序设定为:Left>Right.
4. 关闭材质编辑器中所有的Reflections 反射会在基于颜色临界值设定的光照贴图中增加不必要的采样
5. 打开全局照明(GI). 设定Irradiance Map Presets>Low. 确认Show calc. Phase被选中来观察光照贴图的计算和哪些部分进行了采样




天光/环境光照明:
1. 创建一个Omni light并将其关闭。这样就去掉了场景中缺省的灯光。打开 Environment>GI Environment (Skylight).
2. 确认Overide MAX's 被选中。
3. 选择灯光的颜色值为蓝色,例如:R173 G208 B255 并将倍增器的值设定为Multiplier=4.0. 间接照明光线显得太暗。我们有两种方法来改进: i) 增加Multiplier 的值或 ii) 在渲染对话框中使用Color mapping 选项。 Color Mapping 允许对明亮区域和黑暗区域的对比度进行有限的调节控制。
4। 我们在这里使用Color mapping,因为外部具有足够的照明而我们只需要增加室内照明。设定Dark multiplier to 2.0. 技巧: 保存光照贴图并且在我们调节颜色映射参数 (color mapping multipliers)时重复使用它. 来自帮助文件的解释: 颜色映射参数“控制着颜色值在写入输出缓冲之前是如何处理的。对于室内场景和缺乏灯光照明的场景,颜色的纠正非常有用。你能够获得非常好的图像而无需增加灯光和天光。 Type – 颜色纠正的类型。目前支持的类型只有线性倍增,它通过调节强度值来简单增加颜色的亮度。 Dark mutliplier – 用于增加黑暗区域的亮度值。对于室内场景和缺乏灯光照明的场景,需要增加该值来使黑暗区域获得更多的照明。 Light multiplier – 明亮区域的倍增值。通常应当使用其缺省值1.0,表示明亮区域的光线不需加强。







SUNLIGHT 阳光
1. 创建一个阳光系统。 Sunlight Settings: Color: R255 G251 B237 Multiplier: 3.0 Shadow: On - VRay Shadows
2. 调节阳光系统使得有一些阳光直接照射进入该室内场景。关闭Indirect illumination (GI) 来减少渲染时间。在这里我们不需GI,因为我们只需观察阳光照射的情况。 阳光和天光的混合给室内场景提供了足够的照明,然而,渲染的结果看上去受天光的影响显得太蓝。天光占主要影响是因为二次反射的倍增值教低,为了增加来自阳光所产生的全局照明,将二次反射倍增值调节为:Secondary Bounce Multiplier=1.0 注意: 该项调节不同于调节颜色映射倍增值。颜色映射倍增值(Color map settings)影响一幅图像的明亮度, 而改变GI倍增值影响在光照贴图计算时反射光线的光能分配。所以,改变光线反射倍增值需要重新计算光照贴图,而改变颜色映射倍增值可以使用已保存的光照贴图。 另一件需要注意的事情是来自太阳的天光和环境照明不会在小物体上产生阴影,如栏杆和扶手。增加IR map的 min. & max. rates 可以解决这个问题,但会显著增加渲染时间。另外的解决方案是使用不可见的VRaylight 来模拟来自窗外的光线







补充其余灯光
1. 放置一个VRaylight 在玻璃墙外。确认其法线指向室内。 VRaylight Settings: Color: R255 G245 B217 Multiplier: 1.0 Invisible: Checked Type: Plane 注意由Vraylight产生的较好的阴影。Vraylight不应当设定为Store in IR map, 因为这样在进行光照贴图采样时会模糊该阴影。
2. 打开所有的灯光和光照贴图,现在是重新调节颜色映射设定的最好时机。此时的测试渲染应当很快,因为我们重复使用已保存的光照贴图而仅仅调节颜色映射倍增值,对于最终的渲染,我使用的值为:Bright=1.0 and Dark=1.7 注意: 此处似乎有一个bug,当同时使用Vraylight和光照贴图时,会产生不可预见的效果,如漏光或被Vray灯光锁定。 解决方法: 关闭Vraylight,计算光照贴图并保存,打开Vray灯光并重复利用保存的光照贴图。希望该bug 将来会被修复。



FINAL RENDER SETUP 最终渲染设定
1. 光照贴图计算: 改变光照贴图设定为Medium 或 High. 光照贴图的预设定值取决于出图的分辨率并且针对 640x480 的分辨率进行优化。对于最终渲染,分辨率应当是700x526。
2. 改变Render Output Size 值为你所需要的分辨率值。 检查设定并确认它们与图中类似。 在光照贴图计算完毕后,VRay会自动保存并再次调用它。
3. 打开 VRaylight . 增加Subdivs值来发射光子。
4. 取消玻璃的隐藏,在材质编辑器中打开材质的反射。
5. 改变图像抗锯齿值(AA)为: Adaptive Subdivs=0,2. 如果图像中有许多noise特效,例如在大的光滑反射区域使用了noise特效,simple two-level AA 抗锯齿要快于 Adaptive Subdivs.



POST PROCESSING后期处理

尽管VRay能够制造出很好的图像,通常应当用photoshop中做一些后期处理来对其进行一些微调。
1. 复制一个原始图层。
2. 选择Image>Adjustments>Color Balance. 选中Highlights将该复制图层增加一些Red 和 Yellow值。
3. 将blending mode 设定为Color, 降低复制图层的透明度至30-50%. To add specular blooms:
4. 再次复制一个原始图层,将其设定为Screen模式,位于另外两个已有图层之上。
5. 将该图层添加一个mask。复制该图像并将其粘贴到mask通道中。这样就会将该图层的所有黑暗区域遮掩起来,只保留明亮区域。调节该mask通道的levels。
6. 添加高斯模糊Gaussian Blur来柔化高光区并调节该图层的透明度至满意结果。 还可以添加其它特效。 CONCLUSION结论 该场景提供了一个有趣的挑战,因为它同时包含了室内和室外空间。通过使用VRay的这些功能,我们能够在较短的时间内获得非常自然和真实的效果。 总结: Skylight + Sunlight + Fill lights = Total Illimunation


Thursday, March 15, 2007

北京地铁六号线的设计招标公告(土建设计)

勘察设计招标公告

工程编号 110000200702150612

招标登记日期 2007-2-15

投标报名开始时间 2007-2-16 9:00:00

投标报名结束时间 2007-3-5 16:00:00

投标报名地点 北京市崇文区广渠门南小街领行国际3号楼2单元9层

工程概况:

工程名称 北京地铁6号线一期工程工点设计02-06合同段(土建设计)

建设单位 北京市轨道交通建设管理有限公司

招标方式 公开

工程地点 北京市海淀区、西城区、东城区、朝阳区、通州县

招标内容 设计 招标联系电话 67169793-301

招标联系人 王冉 对投标人资质要求
详见公告说明 投标单位名额

公告说明:

1、本次招标采取资格预审方式,不限制投标人数量。

2、本项目招标不接受网上报名。

3、本项目对投标排名第二且未中标的投标人补偿30000元人民币,对投标排名第三且未中标的投标人补偿20000元人民币。

4、报名准备材料:授权委托书、身份证复印件、相应的营业执照及企业资质证书原件及复印件(复印件加盖公章)。

5、具体合同段划分及投资额详见资格预审文件。

6、具有建设行政主管部门核发的市政公用行业(地铁轻轨)甲级设计资质;当具有建筑行业建筑工程甲级设计资质的投标申请人参加投标时,必须与具有市政公用行业(地铁轻轨)甲级设计资质的投标申请人组成联合体,并由具有市政公用行业(地铁轻轨)甲级设计资质的投标申请人作为该联合体的牵头人。 工程描述 [table=98%] 建筑面积(㎡) 约30।1公里 建筑高度(m) 投资额(万元) 约370000




पस:以上内容从北京工程建设信息网截取