d***y
发帖数: 408 | 1 研究了很长时间很多种磨皮的办法，基本上没有让我特别满意的。
大部分的方法是在PS里用 blur 然后在mask layer 慢慢 brush 除眼睛，鼻子和嘴唇外
的脸部区域，最主要的缺点是经过blur后的皮肤，失去texture, 光滑的像橡皮娃娃，
也有通过加noise layer 来重新塑造皮肤质感的，总是不很满意。
用过一段portrait professional max 6, 效果可以接受，但是缺点是一次只能处理一
张脸，而且不能是侧面的，身上其它的皮肤就没办法了，总不能光滑白嫩的脸配一个黑
脖子。这个软件的好处就是简单，不需要任何的PS知识，对于正面照脸上皮肤的处理功
能还是很强大的。
无忌论坛里也介绍过一种方法，感觉处理后的照片太朦胧，但是通过color channel选
取高光区的办法倒是为我后来提供了很大的帮助。
这里我总结的方法和流程不是自己的创造，而是看了那么多磨皮方法后综合各家的长处
，最主要的目的就是在滑嫩皮肤的同时保持其质感。每个人肯定有自己不同的方法，欢
迎交流。 最后付上 before, after.
1。除斑，痣，痘。这个最简单，但是要第一部做。可 |
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l*****s
发帖数: 1754 | 2 I looked at the setting of some of your photos, 135mm, f/2, 1/250, iso500.
If you want to freeze motion, you need 1/500 or 1/640 shutter, you can
easily do it by increasing iso. For 5D3, iso3200 is safe. Below that shutter
, there will be motion blurs at hands/feet/ball, and sometimes you might
want some blur.
Do not use shutter priority, use manual. It is indoor, and lighting does not
change. Even if it changes a little closer to light, it is within 2 stops
of change, and you can correct them i... 阅读全帖 |
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s*****g
发帖数: 5159 | 3 You need the following things to compute the blur,
1. Diameter of the lens (not the F number)
2. Focal length of the lens
3. The distance of the object point that is in focus
Then using Gaussian formulate, you could easily compute the diameter of the
blur circle of an off-focus point.
Have fun. |
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l*******s
发帖数: 26303 | 4 简单叠加出来也没有这种绸缎的效果，可能还得在local的地方加blur和motion blur其
他效果 |
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s****i
发帖数: 2993 | 5 DOF is same. background blur is not same.
basically same subject size, background objects would be larger
and more blur with longer focal length lens, even DOF is same.
关。 |
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t***e
发帖数: 2138 | 6 The boring explanation Here follow some technical explanations: First of all
, my deepest apologies to those not familiar with mathematicsor physics…
But the conclusions are very interesting…. (see at the end) I did some
serious thinking to understand the rule of thumb of using a shutter speed
equal to the inverse of the focal distance. Here are the results: first some
(half-serious) maths: Let's start with the basic definitions and
assumptions: To simplify the calculations, we assume we can mod... 阅读全帖 |
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G**Y
发帖数: 33224 | 8 D800E - 'cancellation' of anti-aliasing filter
Nikon uses slightly curious wording about the D800E - that the anti-aliasing
effect of the optical filter stack in front of the sensor is 'cancelled' -
and the diagram below shows what this means (courtesy of Nikon). Anti-
aliasing filters work by using a birefringent material to split light rays
into two based upon the polarization of the light; a first layer splits it
horizontally, the second vertically. The practical result is a slight
blurring o... 阅读全帖 |
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C****c
发帖数: 9157 | 9 不是说演示的图是预先blur了完了再deblur的嘛
不过之前看到有一篇文章是在相机中加入传感器，记录相机在按快门的一瞬间的运动，
完了根据这个来deblur由于相机震动带来的blur |
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b*********n
发帖数: 5846 | 10 似乎没有啊，一开始我以为应该100%下会有blur, 试了一下居然没有，惊奇之下，我拍
了至少五六次，结果居然都没有blur， 我1/40s长焦端拍单张作对比还是拍了三张才找
到张锐利的， 不知道索尼给鸡血模式用的什么算法。 |
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f*****Q
发帖数: 78 | 11 多谢回复！主要看到amazon上这段评论比较犹豫：
"Ugh. There is no in-camera anti-shake. And this takes a lot of getting used
to. I'd wager that a good 20% of shots will be missed by anyone using this
camera until they learn how to compensate for this issue by using a higher
ISO than should be needed or using the shutter priority setting or whatever
else. Major whiff on the part of Sony and basically keeps this camera from
being truly great. There are pictures that you'll take that you will think
are in focus by viewi... 阅读全帖 |
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i**e
发帖数: 6810 | 12 网上看到这个头有 42mm端1/60-1/200s blur门，貌似很普遍，不知道是否每个
copy都有这问题？不求光学上改进（因为跟老14-42比除了广角端几乎没有改进），
但求体积小，碰上blur就麻烦。用过的说说？ |
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w****e
发帖数: 2210 | 14 Take a look at the list of ALL 51 improvements the X20 has over the X10,
1. 2/3-inch X-Trans CMOS II sensor without optical low pass filters improves
resolution to as much as a 4/3″ sensor.
2. S/N ratio improved to level similar to Full frame sensors.
3. Phase detection AF allows for AF speeds as low as 0.04secs (compared to
X10 0.16secs).
4. 1080p HD video @ 60fps (X10 1080p HD video @ 30fps).
5. Phase detection Autofocus also works during movie recording.
6. Face detection works during movie r... 阅读全帖 |
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p*********r
发帖数: 4593 | 15 Used the Google translator to translate. Some of the text can not be copy-
pasted for some reasons. Most of the comments for each camera were copied.
Here is from output from Google translator
A sharp photo of example
to shoot a building is today
no longer a challenge for
a system camera. But alas, the subject
moves: Be it the pedaling child, the
rennende athletes or vorbeiflitzende
Sports car, the autofocus systems are guided to their limits. During
the focus on static
Motifs in the laboratory ... 阅读全帖 |
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d**********n
发帖数: 3634 | 16 reddit 上有人发了一个大概的tutorial, 大家有兴趣实实
Start with a portrait, backlit by afternoon/near-sunset light. Most of her
photos don't have the sun in the frame, which gives it a interesting
contrast. Make sure to underexpose a bit, in order to retain highlights.
I'll try to quickly recreate this - I'm using Camera Raw+Photoshop, fyi.
First, take your image and up the whites, and lower the shadows or blacks (
whichever's appropriate to keep the face looking not too contrasty). Then up
the temperature to war... 阅读全帖 |
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S******n
发帖数: 5022 | 17 The Tokyo district court ordered Sigma to pay 1.5 billion JPY (around 14.5
million dollars) compensation to Nikon as a result of the patent
infringement case for lenses with VR technology that was filed back in 2011.
The lawsuit was based on six Sigma lenses with image stabilization
technology. Initially Nikon was looking for a compensations of 12 billion
yen (around 116 million dollars).
Here is the summary of the judgment:
"Nikon obtained the patent related to VR technology in 2002. The conten... 阅读全帖 |
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b******g
发帖数: 3616 | 18 小光圈照片包括广角照片，通过适当的lens blur而减少DOF是可以做到的。我见过有
digital fine art的摄影师这么做。不过长焦那种虚化要在ps里做到不能说不可能，但
是难度非常大。先不说bokeh等因素，就是要获得精确的选区难度已经不小了。当后期
blur加的程度很大时，一点点选区的不精确马上会被放大出来。 |
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Y**i
发帖数: 6922 | 19 棒冰你是风光摄影专家,考虑的因素要比我多.我就是拍个人,把人突出一点就够了,呵呵.
姑娘拉这气球的这一组,有一两张我想试验一下,看看效果好不好,树林里为了光线人的
站位很受限制,我想这次用点lens blur/field blur弥补一下. |
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T*******I
发帖数: 5138 | 20 Copied from the link:
http://snapsort.com/learn/image-stabilization
Short Description
Image stabilization prevents blurring images from camera shake. It's
especially important to have image stabilization when buying a large zoom
camera, or when shooting in low light situations because the images are at
significant risk of being blurred. There are different types of image
stabilization. Lens stabilization is the best, senor stabilization second
best and digital stabilization the worst. If image s... 阅读全帖 |
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l*****s
发帖数: 1754 | 21 We went to camp at lake livingston state park this weekend, as there is no
moon for the majority of the night. As the park is about an hour and a half
from the city, we are hoping to see some nice dark sky there.
We arrived the park around 3pm, set the tents, went for fishing for a while
and scouted for a photo shoot spot, shot some sunset portrait, and went for
a BBQ.
10:30 pm, it was pretty dark already. We went to the photo spot to see if we
can get some photos. To our disappointment, the li... 阅读全帖 |
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a*o
发帖数: 25262 | 22 再来一个 Adobe 网站需要的显示卡要求，最低要求是 512MB 显卡内存，不是电脑内存
。。
“
GPU-enhanced features added in Photoshop CS6
Adaptive Wide Angle Filter (compatible video card required)
Liquify (accelerated with compatible video card with 512 MB of VRAM)
Oil Paint (compatible video card required)
Warp and Puppet Warp (accelerated with compatible video card)
Field Blur, Iris Blur, and Tilt/Shift (accelerated with compatible video
card supporting OpenCL)
Lighting Effects Gallery (compatible video card required with 512 MB
of V... 阅读全帖 |
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a*o
发帖数: 25262 | 23 再来一个 Adobe 网站需要的显示卡要求，最低要求是 512MB 显卡内存，不是电脑内存
。。
“
GPU-enhanced features added in Photoshop CS6
Adaptive Wide Angle Filter (compatible video card required)
Liquify (accelerated with compatible video card with 512 MB of VRAM)
Oil Paint (compatible video card required)
Warp and Puppet Warp (accelerated with compatible video card)
Field Blur, Iris Blur, and Tilt/Shift (accelerated with compatible video
card supporting OpenCL)
Lighting Effects Gallery (compatible video card required with 512 MB
of V... 阅读全帖 |
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n*****1
发帖数: 1329 | 24 价位比，才合理。另外，d3300:
The Nikon D3300 has some of the best low light and best picture quality of
mid level DSLR cameras, in the APS-C sensor size (this is not a full size
sensor, but to get a full size sensor you will need to spend about $2000 or
$3000 more).
Nikon D3300 is rated 30% higher in image quality compared to the Canon 70D.
The Nikon D3300 has a slightly larger sensor than the Canon 70D.
I was torn between Canon and Nikon. If you look at all the complaints about
Canon in the last 1 or 2 ye... 阅读全帖 |
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K*****t
发帖数: 389 | 25 今天拿iphone 7+ 试一下portrait mode
DSLR
iphone 7 plus portrait mode
拍几张才有2张有blur, 不是每张都可以blur |
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l*y
发帖数: 21010 | 26 我是一个被开除的吉他手
田鹏这个名字被人们熟知，还是因为他同朋友合作“超级市场”时发表的那两张专辑
。尤其是第一张《模样》，更是被公认为国内电子音乐的开山之作。然而为许多人所不知
的是，在那之前，田鹏还组过别的乐队，只不过当时乐队的风格是距离电子音乐足足有十
万八千里的死亡金属。那支乐队便是后来被公认为国内资格最老的死亡金属乐队——冥界
，但可惜的是，田鹏还没等那支乐队正式成立，便因为技术不过关而被开除了。关于这其
中的细节，他从未向媒体讲起过。
“基本上知道我那段经历的人，都说我是被‘冥界’给开除了，但事实比这个更惨，
我是在‘冥界’还没成立的时候就被开了。”
“那会儿我们身边儿的那帮人都特喜欢金属，我自己耳濡目染的也听到一些。后来看
到学校里有像唐朝、清醒这样的乐队，觉得挺喜欢的，就琢磨着自己也弄个乐队。92年毕
业之后我买了一把吉他，和王强、司徒小春、抓鸡他们几个组了个乐队，当时叫‘失重’
，玩的是死亡金属。后来觉得这个名字不够死亡，就改名叫‘死亡钟’了。几个人在一块
儿玩了没多长时间，虞洋（后来铁风筝乐队的主唱——编者注）就进来了，和他一比，我
技术明显... 阅读全帖 |
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b*s
发帖数: 82482 | 27 Galaxy也不是这回事：
As good as smartphone cameras have gotten, they struggle to capture photos
with a high degree of bokeh — where the background is kept artistically out
of focus while the subject in the foreground is nice and sharp. But the
Samsung Galaxy S5 has a neat feature where you can simulate the effect.
In some picture-taking modes, the GS5 lets you designate a specific subject;
tap the person or object you want to be in focus and snap the pic. Once you
've got it, you can open the pic in Po... 阅读全帖 |
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s**s
发帖数: 404 | 28 can we use "unsuitble for" and "applicable for" here?
ok, I see. "unsuitable" is used when we need apple instead of orange; while
"not applicable" is used when we prefer photoshop to blur ourselves rather
than 10-mega camera to amplify the blur. |
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p******k
发帖数: 2192 | 29 我是自动从信用卡里扣，有次刚好卡被fraud了，被信用卡公司停了，他们一时没收到
钱，就给我写信，blur blur了一堆，有一条大致是说虽然我没交钱，但按我们州的法
律我还能用到某某日，大致是两个月之后，所以我知道不是一不交钱就马上停的。 |
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c****t
发帖数: 19049 | 30 HALF-LIVES
the first luisa rey
mystery
I
Rufus Sixsmith leans over the balcony and estimates his body’s velocity
when it hits the
sidewalk and lays his dilemmas to rest. A telephone rings in the unlit room.
Sixsmith dares not
answer. Disco music booms from the next apartment, where a party is in full
swing, and
Sixsmith feels older than his sixty-six years. Smog obscures the stars, but
north and south
along the coastal strip, Buenas Yerbas’s billion lights simmer. West, the
Pacific eternity East... 阅读全帖 |
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n*******d
发帖数: 650 | 31 show me one example and tell me what do u need? do u need
small pic for web use or large ones for storage/printing?
basically i think u can do it in Matlab: 2-D fourier
transform the photo,
apply a low pass filter(2-D) to cut the high frequency
components(纹路). This will blur the whole image, though. so
u will have to carefully choose ur filter shape and size.
in photoshop(5.3+), there is a option called "history
brush"---->you blur the whole image--->define as history
brush--->choose option(say, |
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m****u
发帖数: 270 | 32 【 以下文字转载自 Gowest 讨论区,原文如下 】
发信人: blur (小的只是路过), 信区: Gowest
标 题: [转载] DON'T EVER DIAL AREA CODE 809
发信站: The unknown SPACE (Tue Nov 7 00:26:44 2000), WWW转贴
【 以下文字转载自 Overseas 讨论区,原文如下 】
发信人: blur (小的只是路过), 信区: Overseas
标 题: DON'T EVER DIAL AREA CODE 809
发信站: The unknown SPACE (Tue Nov 7 00:25:53 2000) WWW-POST
DON'T EVER DIAL AREA CODE 809
This one is being distributed all over the US. This is
pretty
scary -- especially given the way they try to get you
to call. Be
sure you read this & pass i |
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g********8
发帖数: 659 | 33
是新款blur
还是standard的都blur
我刚退的老款感觉还好啊
hi－res都说字小，还得放大，麻烦 |
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l*m
发帖数: 824 | 34 You should understand the relationship between exposure time and focal
length. For shorter focal length, the safe exposure time (for minimize the
hand motion blur) is longer. A common rule of thumb for estimating how fast
the exposure needs to be for a given focal length is the one over focal
length rule, but that is for full frame camera or 35mm format sensor.
For cell phone camera, the sensor is much smaller. For iphone4s/5, it is
about 3.4mm x 4.6mm. The crop factor should be 7.8 (36mm/4.6mm)... 阅读全帖 |
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a***y
发帖数: 19743 | 35 总的来说google还是很厉害的了，能够跟苹果跟的这么紧。不过从presentation上来看
，有些东西可能是临时加的。google宣布东西经常都不如苹果宣布的成熟。
material design
这明显是狗狗想要学苹果造名词。depth难道不是ios 7就说要增加的吗？drop shadow
是苹果一直在os ui上领先其他操作系统很多年的玩意儿。ripple，n年前的OS X就把这
个作为亮点，现在都没人在意了。不过也许这些能够改进安猪的可用性吧。
纸张？难道不是苹果已经抛弃的skeumorphism?
颜色
难说狗狗不是学苹果把颜色做成了比儿童玩具还鲜亮的风格
动画
动画太多很distracting。每次苹果做了太多动画，用户都抱怨。现在狗狗的动画超越
了windows phone？更让人头昏眼花？连refresh按钮都要旋转了。有点夸张了，可以说
在一定程度上有点low taste。不过这个lead designer看起来就有点装b装的不到位，
比Ive差多了。另外展示的一些scroll效果iOS有了很久了。这是苹果一贯的细节追求，
根本不需要吹，狗狗是学到一点就狂骄傲。拨... 阅读全帖 |
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k**********s
发帖数: 6409 | 36
7的这个没做好？你的IE的版本太低？我的Win8上的所有的MS软件，比如IE10，
Office2013，还有Firefox等，都没问题。我用Opera，还有Chrome倒是都blur，但是在
8寸的小屏幕上根本不是问题，反倒很醒目。ClearType不正是人为地加blur来提高可读
性码？ |
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s*******h
发帖数: 1361 | 37 区别还要看你玩什么游戏，是静态居多的stategy还是动态要求高的FPS。偏静态的基本
没什么特殊要求，偏动态显示器速度要求高一些，譬如Pixel response, input lag,
refresh rate, adaptive sync, etc etc... 不然就容易出现frame lag, screen
tearing, flicker, motion blur, poor black dynamics, 头晕眼花打枪描不准，etc
etc...
一般高速电竞显示器特征1ms，144hz，G-sync, Free-sync，blur reduction, flicker
free等等等等。具体还要看玩什么游戏和其它硬件。 |
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s*******h
发帖数: 1361 | 38 区别还要看你玩什么游戏，是静态居多的stategy还是动态要求高的FPS。偏静态的基本
没什么特殊要求，偏动态显示器速度要求高一些，譬如Pixel response, input lag,
refresh rate, adaptive sync, etc etc... 不然就容易出现frame lag, screen
tearing, flicker, motion blur, poor black dynamics, 头晕眼花打枪描不准，etc
etc...
一般高速电竞显示器特征1ms，144hz，G-sync, Free-sync，blur reduction, flicker
free等等等等。具体还要看玩什么游戏和其它硬件。 |
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u******a
发帖数: 7843 | 39 我也不确定 60fps 是不是比30fps 更好. 我其实是同意被很多人骂的 "30fps 能给人
更好的 cinematic 体验" 的. 高 fps 可以让人可以看清移动物体, 但实际上的效果却
是使画面的代入感变的更差了. 因为人原本是看不清移动物体的, 突然让你看清, 反而
不习惯...体育比赛使用 60fps 在技术上使得重放慢镜头判罚更为精准, 但我不确定这
提升了观众在正常速度下的体验, 一般都认为 60fps 看起来像廉价的 reality show.
我觉得 motion blur 是很好的技术. 因为人本来就看不清, motion blur 模拟了这一
点, 增加了临场感...
以后也许会解决 60fps 看起来怪怪的问题, 但目前来说高 fps 不一定提升了玩家的体
验吧...游戏只要不丢帧, 没有 fps 的波动, 效果就很好了. |
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u******a
发帖数: 7843 | 40 因为好奇就又专门研究了下.
游戏 30fps 等于是每秒曝光30次, 照相30张, 曝光时间只有一瞬间. 摄像虽然每秒只
有24帧, 但是曝光时间可以高达1/24秒, 信息用 blur 的方式保存下来. 所以看电影
24fps 就够了, 玩游戏30fps 却可能觉得不舒服. 不过 motion blur 技术可以大大减
少这种不爽感, 而且更好的模拟摄像机和人眼.
据吉他英雄的 Mick West 说, 30fps 和 60fps 因为帧数导致的输入 lag 并不是1/60
秒, 而是 1/20 秒, 如果程序员水平低, 可能达到 1/10 秒. 所以在需要快速反应的游
戏, 高帧数好一些.
http://www.gamasutra.com/view/feature/130359/programming_respon
因为这个帖子, 我在 youtube 上也看了不少30fps vs 60fps 的视频和下面的评论. 我
个人是觉得在镜头低速移动的状态下几乎没区别, 镜头高速移动时60fps 明显更流畅,
但是我不确定这种所谓更流畅的感觉是否提升了游戏体验. youtube 的评论也是... 阅读全帖 |
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u******a
发帖数: 7843 | 41 30fps 开 motion blur 并不会觉得卡. 快速移动镜头并且每一帧都显示清晰的画面才
会觉得卡, 因为丢失的信息太多了.
电影24fps 都不卡就是因为自带 motion blur. |
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k**********g
发帖数: 989 | 42 Do you need to measure lines of different orientations? Are they always
nearly vertical?
If they are nearly vertical (with slight distortion), you can apply 1D FFT,
horizontally, on each row of the image.
The peak amplitude and its phase together gives the horizontal shift amount
at each row. Because of FFT, the location of the peak is not affected by the
blurring unless the blurring is so severe that the periodicity is
completely destroyed. |
|
