t**i
发帖数: 387 | 1 Watched this creativeLIVE workshop on light meter. The most confusing thing
to me was that he said incident light meter will give correct exposure only
if the subject is 18% gray, therefore overexpose dark tones and underexpose
light tones. To me this is what reflective meter will do, incident meter
measures the luminance falls on the subject, don't care what the subject is.
To my understanding, an incident-light meter will cause a medium tone to be
recorded as a medium tone, and a reflected-lig... 阅读全帖 |
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o**s
发帖数: 3412 | 2 I used ACR to bring up the shadow, increased yellow luminance, saturated
yellow and green just a little bit, and finally in photoshop burn/dodge a
little bit. |
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P*****u
发帖数: 133 | 3 握个手，看你隔壁回别人的帖子的时候就觉得你应该有cognitive science背景，不然
为啥老纠结眼睛看的和相机出的有啥区别。
我当初给别人解释这个裙子现象的文章和你的说的实际上差不多，贴上来娱乐一下。
I suspect we are seeing a combination of difficulty in achieving lightness
constancy (figure out whether it’s white or black) + color constancy (
figure out whether it’s blue or yellow) here.
Human vision, like camera, also needs to figure out what are the color or
brightness level of the light source (think of the AWB or AE mechanism in
camera). But mathematically speaking, there is always ... 阅读全帖 |
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f***a
发帖数: 152 | 5 http://luminous-landscape.com/essays/antarctica-2009-worked.shtml
"The largest group of failures through were among the Canon 5D MKIIs. Of the
26 samples of this camera onboard, one quarter (six) failed at one time or
another, and while three recovered, the other three never did. In all cases
it appeared to be water or humidity damage. Of particular concern were two
cameras which stopped working while completely protected within Kata rain
covers during a light rain ashore. They came back to life |
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k**o
发帖数: 3006 | 6 ☆─────────────────────────────────────☆
fella (latio) 于 (Sat Feb 21 18:19:59 2009) 提到:
http://luminous-landscape.com/essays/antarctica-2009-worked.shtml
"The largest group of failures through were among the Canon 5D MKIIs. Of the
26 samples of this camera onboard, one quarter (six) failed at one time or
another, and while three recovered, the other three never did. In all cases
it appeared to be water or humidity damage. Of particular concern were two
cameras which stopped working while com |
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y*********e
发帖数: 7269 | 7 访谈和试用汇报：
http://www.luminous-landscape.com/reviews/cameras/pentax645d-1st.shtml
Highlights：
芯片没有用AA filter，因为Kodak画质很好。对于主要应用风光摄影的机器来说，解像
力更加重要。在时装应用中，也极少有摩尔纹，可以通过软件去除。
销售潜力很大，第一天宣布，东京一家店就收到15份订单，那时候机身还没有拿出来让
人试用过。之所以先日本市场投放，是因为别的地方技术支持和服务尚不到位（需要培
训维修人员？）。
三防很强。防雨能力，能防任何水量任意长时间的泼溅，但是不能放到水下。防冻能力
，在零下10摄氏度，电池能拍摄650张照片。Sensor自动除尘。LCD的玻璃都是加固的。
三防表现突破传统中幅相机，更像135专业机。
Dynamic Range是Kodak的芯片决定的，11.5 Stops。（感情Mamiya标称DM40是12 stops
是四舍五入的）
目前芯片不能Live View，但是很感兴趣以后实现。
目前不能远程控制拍摄，但是正在做这个方面工作。具体什么时候（软件）面世，尚 |
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n******d
发帖数: 691 | 10 是，看起来4x5仍然不是数码小邮票可以比的。是我没看仔细，不好意思。
http://www.luminous-landscape.com/columns/1Ds-4x5.shtml
我个人的感觉，1Ds II应该和中副加底扫差不多。中副后背应该和4x5加imacon差不多
。其实，无所谓了。除了专业人员，有多少人天天出片到13x19...
国内120正片冲洗加Imacon848扫描到15m，一卷50/60RMB。够用了。我已经把我的ss120
在那边出掉了。另外，在大城市不方便随处停车，所以中副器材动得也少。 |
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w******0
发帖数: 62 | 11 用分辨率来确定选书妈还是非林这本身就是很joke的，这种讨论，也就luminous-
landscape喜欢做，不知道害了多少人，他自己就是个杯具，象样的照片一张没有，成
天pk器材，典型的器材wsn，这网站的繁荣充分迎合了书妈大潮后成倍增长的摄影爱好
者的低级趣味。
ss120 |
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k****t
发帖数: 12697 | 13 俺根本就不感冒ZONE SYSTEM 那套东西. 我只是从经验知道DANDELION 花LUMINANCE 差
不多就是18% 灰.
整体level histogram在此是IRRELAVANT, SINCE WE ARE TALKING ABOUT SPOT
METERING. |
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s**********s
发帖数: 7387 | 14 你用desaturation来算luminance本来就是错的，
在这个基础上用level推算得出的结论还用想么，呵呵
这些都是非常基本的常识问题了 |
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s**********s
发帖数: 7387 | 15 hehe，不是转gray的问题。实际上比这复杂。转gray也不完全对。
关键根desaturation的原理有关。红绿蓝黄橙几种标准ASCII亮色，desat了以后都是
128，128，128的中性灰。而只要在场地里测过灰卡或者测过入射的人，一般都会知道
红色与黄色的反射率是截然不同的，两者可以差到1.5EV左右。
拿这个desaturation来推算luminance那真是贻笑大方了。 |
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s**********s
发帖数: 7387 | 16 lab+desat一般来说会得出符合数码相机测光要求的正确结果。
直接RGB转gray，取决于场景，通常差别跟lab+desat的结果不会太大。
直接RGB desat基本都严重欠曝。
红色、绿色差不多都是中性灰，蓝色要欠半档左右。绿色之所以是中性灰，与人眼视觉
也有一定关系，其实他本来要欠一点。黄色这种是两种原色光都反射，luminance自然
要高一点，再加上人眼视觉的影响，实际高了1.3-1.5EV.
%的 |
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g***l
发帖数: 2753 | 17 LR里面的。LUMINANCE里面的BLUE和PURPLE减少，BLUE减少40-50，PURPLE减少10-15，然
后FILL LIGHT增加点，10左右吧。 |
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S*M
发帖数: 10832 | 18 甭提画质了
luminous landscape上有人拿G11和数码中幅比过
出片13x19没人能看出区别 |
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c*******d
发帖数: 1172 | 22 亲身体验是7D如果没有配上分辨率高的镜头（譬如套头28-135），画面会稍微肉一些
如果配上牛头的话锐度不比其他机身差
个人估计是sensor分辨率太高的缘故，很容易out-resolve狗头
不过我不得不说7D的luminance noise明显比低分辨率的机身要高
我从K10D跳到7D，第一次看100%的时候吓了一跳
不过有LR3，多少挽回一些 |
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s**********s
发帖数: 7387 | 23 sharpness vs moire - you can't have the cake and eat it to.
O+ simply votes to have the cake without eating it
or in the common tongue, they decided to live with the moire. btw, none of
the medium format sensors in the market have AA filter. M9 doesn't have one
either.
some further discussions here:
http://www.luminous-landscape.com/reviews/cameras/achromatic.shtml |
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c*******d
发帖数: 1172 | 24 7D很好的，除非你主攻风光或者微距，因为7D画质肉，diffraction limit有点过分
如果你配的镜头很好，7D很不错。如果你配狗头，7D会非常肉
还有就是高感不怎么样，低感的噪声也很大，不过lr3救回来不少。我一般都是
luminance直接拉到40才能pixel peep
的？ |
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x****c
发帖数: 25662 | 25 是，color和luminance都拖一下看看
或者说你照片本来就没啥噪点？
还有就是你用jpeg还是raw？ |
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k****t
发帖数: 12697 | 26 俺DEFAULT 就是这样, TO ENSURE EXPOSE TO THE RIGHT. 要看细节按+ 就是了, 不过
HISTOGRAM 就LUMINANCE 没三通道.
只显 |
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s**********s
发帖数: 7387 | 27 scintillation跟望远镜有关系？
Scintillation or twinkling are generic terms for rapid variations in
apparent brightness or color of a distant luminous object viewed through a
~~~~~~~~~~~~~~~~~~~~
medium, most commonly the atmosphere (atmospheric scintillation).
and |
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R***a
发帖数: 41892 | 30 luminous-landscape有上南极的报告，
反正最后5D2最惨，坏的最多 |
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x****c
发帖数: 25662 | 31 HSL/ color / B&W的 color下
选桔黄色，减saturation，加luminance
在curve那里可以点左上角的小圆点，然后移到人皮肤上，点住左键向上推，增加皮肤
曝光，效果会更好。 |
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x****c
发帖数: 25662 | 33 raw进dpp的话，应该根据你在机身设置的降噪级别，进dpp啥都不改，导出来的jpeg就会
应用机身内设置好的降噪，auto，standard，strong之类的。correct me I am wrong
lightroom不一样，一般导入，默认降噪是关的，必须自己调整降噪程度。
在develop模式下右边面版里找 noise reduction
降噪分成两种，一个是luminance，一个是color，你可以分别调整。
参考
http://www.youtube.com/watch?v=gmc8aHCCI3Y |
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c*******d
发帖数: 1172 | 34 E口的对焦速度现阶段是多少？
Luminous Landscape的review还是比较靠谱的吧 |
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n******e
发帖数: 623 | 36
这是wiki上说的：
The photograph's fame was probably enhanced by Adams's description in his
later books of how it was made: the light on the crosses in the foreground
was rapidly fading, and he could not find his exposure meter; however, he
remembered the luminance of the Moon, and used it to calculate the proper
exposure. Adams's earlier account was less dramatic, stating simply that the
photograph was made after sunset, with exposure determined using his Weston
Master meter. However the exposure was... 阅读全帖 |
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y*********e
发帖数: 7269 | 38 luminous-landscape那边好多都是专业风光摄影的人，素来非常赞赏Pentax的机器。
我看国内现在玩645D的无忌俱乐部里面，感觉有些都是新手，真是有钱阿。
不过俱乐部里面还是颇有些好照片的，特别是大图。我很喜欢下面这张。很体现645D户
外耐寒机的素质。如果有更大的图就更爽了，我已经拿这张照片作桌面了，呵呵。
http://tinyurl.com/3xed4oj
photographer |
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a*********d
发帖数: 593 | 41 补充一下，全程手持，很轻便倒是，由于直出有过爆倾向，EV一直-1拍摄，后期lightroom里
luminance噪点打到75，然后各边压50% |
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i***f
发帖数: 10682 | 42 他的意思大概是，Canon的Body比Sony的差很多，Canon的镜头和Sony基本一样多而且很
多是重复建设的。。。
“Tired of hearing the endlessly and tiresome song “The A-mount has a very
limited number of lenses; I would wish to post this comparison, so everybody
could speak knowingly.
Debunking myths… if only a little
It is a truth repeated and accepted by everybody that Sony lacks the breadth
of catalogue of Canon or Nikon. And that is often used when evaluating the
Sony products: “Yes, it could be a good camera, but when you need to make
grow ... 阅读全帖 |
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f**********c
发帖数: 651 | 43 据说这是好镜头的表现， quoted from ll:
Those "tiny black specks" are what you get when the lens is an odd number
of half-wavelengths out of focus. Note how both the foreground and
background point sources gradually show an increasing pattern of light and
dark rings - and more critically, how these ring patterns exhibit
identical shapes and intensities at a given degree of defocus in front of
and behind the plane of sharp focus? That beautiful symmetry, between
inside and outside focus, is a sign of near-pe... 阅读全帖 |
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e**n
发帖数: 5876 | 45 GH2是摄像神机， movie mode高感远远盖过60D，7D一类。 而相比之下，nex的movie
mode就差很多。
Luminous Landscapes评价“ My colleague Chris Sanderson and I spent a morning
shooting side by side comparisons against the Canon 7D. Chris is a life-
long director / cameraman / videographer, and has a professional's eye. What
our tests of the NEX-5 showed were lower video resolution, saturation and
contrast than from the 7D, and a softer all-around appearance to the footage
.”
“The GH1's sensor is better overall than the 7D, despite bei... 阅读全帖 |
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e**n
发帖数: 5876 | 46 Luminous Landscapes 是这么说的“My colleague Chris Sanderson and I spent a
morning shooting side by side comparisons against the Canon 7D. Chris is a
life-long director / cameraman / videographer, and has a professional's eye.
What our tests of the NEX-5 showed were lower video resolution, saturation
and contrast than from the 7D, and a softer all-around appearance to the
footage.” |
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c********y
发帖数: 30813 | 47 ☆─────────────────────────────────────☆
redskeleton (红骨架／白菜猪肉丸子汤) 于 (Wed Dec 22 23:40:22 2010, 美东) 提到:
带老婆孩子出去看灯展，照了不少照片，回来一看，我靠，这圈圈也太多了点，整个无
数同心圆套在一起，这焦外..............
☆─────────────────────────────────────☆
arsilverfox (Alli) 于 (Wed Dec 22 23:41:35 2010, 美东) 提到:
快做个桃心镜头盖拍心型bokeh~x]
☆─────────────────────────────────────☆
yuanwang (gauntlet) 于 (Wed Dec 22 23:42:20 2010, 美东) 提到:
我觉得还不错啊
☆─────────────────────────────────────☆
beetle1986 (beetle) 于 (Wed Dec 22 23:42:46 2010, 美东... 阅读全帖 |
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q*********n
发帖数: 103 | 50 借宝地求教如何计算ccd count number
已知 ccd camera的luminance (radiance)或illuminance(irradiance)以及光的光谱分
布，如何计算出CCD在不同积分时间下，光谱峰值的count number。比如知道了相机镜
头表面的照度是10000lux,我怎么估算CCD在不同波长接收到了多少个counts?
我需要计算饱和度。如果有了这个count level,外加很容易测的饱和时的counts,就可
以预算saturation level 了.
多谢不吝赐教 |
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