Bob Lin – Page 40 – Mobile, Camera

Pixel 3 phone doesn’t have sound

Situation: The user can’t use his new Pixel phone to watch Youtube and music. It doesn’t have sound.

Troubleshooting: In the Sound page, Media volume is grayed out and can’t move to high. We find the “Do Not Disturb” is on. Turn
“Do Not Disturb” off fixes the problem.

Bob Lin, MS-MVP, MCSE & CNE
Data recovery, Windows OS Recovery, Networking, and Computer Troubleshooting on
http://www.ChicagoTech.net
How to Install and Configure Windows, VMware, Virtualization and Cisco on
http://www.HowToNetworking.com

室内摄影的设置，灯光及取景构图

摄影是光的艺术。光线不足是室内摄影最大的问题。就相机而言大致有三种设置。

无闪关灯：光圈开到最大，比如F2.8,速度1/100 Sec， ISO Auto。如果还是曝光不足，放慢速度，比如1/60 Sec。
内置闪光灯: 根据景深，光圈设在F5.6以上（数值小），速度1/100 Sec， ISO 1600. 如果依然曝光不足，放慢速度，加大光圈。
外置闪光灯：光圈设在F5.6以上（数值小），速度1/100 Sec， ISO 800. 根据曝光情况调整光圈，速度和ISO。

为了提供足够的光源和创造拍摄环境，我们做一些简单的布光。

使用反光板或者折射光，尽量避免直射光。
方式一：单灯。

3. 方式二：单灯加侧面反光板。

4. 方式三：闪光灯或者聚光灯在模特侧面或者后面，正面使用反光板。

5. 方式四：聚光灯在模特侧面或者后面，正面使用闪光灯。

构图，取景及模特造型。

虚化背景，最好有背后或者侧面灯。

2. 利用窗户自然光。

3。附桌特写，最好有眼神光。

4. 背后有灯，前面反光板。

5. 扶梯而下，高光拍摄。

6. 广角拍摄长裙。

7. 利用走道的延伸，虚化背景。

8. 利用沙发。

8. 利用壁炉。

9. 利用门窗户。

10. 利用摆设比如，花瓶，酒瓶。

11. 室内拍摄因为空间的限制可以多用广角镜头有达到夸张的效果。

光圈越小越清晰吗？

不一定。理论上说F8~F11之间，镜头成像素质最好。

光圈越小，同一对焦距离、同一焦距下：景深范围越深。光圈越大，同一对焦距离、同一焦距下：景深范围越浅。但是，这并不是说，光圈越小画质越清晰，因为随着光圈的缩小，本来直线传播的光，在穿过小孔的弯散程度越严重，使得分辨率越来越低。同时我们看到原来的一个光点，在光圈非常小的时侯，由于光线在光圈叶片间的衍射而出现了散射的星芒。这就是为什么拍太阳时， F11以后会产生芒光。

那么在什么情况下我们使用小光圈？

在拍摄慢门摄影时，比如拍瀑布，我们大都使用小光圈。

微距摄影。

还有就是希望拍出芒光。

单灯高光人像摄影

高光人像摄影是指人像清晰高调，画面非常明亮华丽。单灯摄影时位置可以在正中，也可以在侧面，但是闪光灯不要对着人，最好是反射。相机设置：光圈F8左右，速度在1/100到1/200之间，ISO尽可能小，最好控制在ISO 800一下。

护照，工作照：F7.1， 1/125 Sec，ISO 400

服装展示：F6.3，1/125 Sec，ISO 800

舞蹈造型：F4， 1/100 Sec， ISO 1000

室内摆拍：F7.1，1/160 Sec， ISO 250

如何拍逆光

曝光补偿：曝光补偿是逆光拍摄时最常见的技巧，一般根据背景光的强弱，在相机原始测光的基础上增加1-2EV的曝光量，主体就能获得比较合适的曝光，这也是拍摄逆光最通用地方法。
合理测光：我们在逆光拍摄时最好使用点测光功能，对拍摄主体适当部位进行精确测光。
逆光拍摄：光线被虚化形成斑驳的光斑，非常漂亮，但由于拍摄这样的逆光时会造成面部较暗，所以用反光板做一些补光会让效果更好。
尽可能不要让阳光直接照射到镜头里面，不然就出现了上面照片上的鬼影（眩光），这样影响照片的清晰度。
在测光的时候选择点测光模式对照片中人物的受光部点测光（比如人物受光轮廓、受光发丝等）。
用反光板（或闪光灯加散射板）对人物暗部（脸部）进行补光。
尽量选择深色的背景，这样才能突出轮廓光的精彩。
使用反光板或者闪光灯对前景适当补光可以得到更多的细节。
逆光拍摄时会对影响自动对焦准确性，可以改用手动方式精确调焦。
单点测光：避免阳光直射完全进入画面中，长时间通过取景器直视阳光可能会造成视力损伤，人物和背景建议单独测光，根据实际光比选择曝光值！
使用大光圈。

实例一：阳光从侧面打在头发上，对焦脸部。

实例二：室内面对窗口，用闪光灯或者反光板补光。

实例三：逆光剪影，以晚霞为背景测光，不要过曝，剪影要突出轮廓。

照片不清晰的原因和解决办法

对焦不准确。

手持相机拍摄产生抖动。使用三脚架和快门线或开启防抖。
使用三脚架时未关闭防抖功能，反倒造成轻微抖动，导致图像模糊。建议在使用三脚架时关闭防抖。
快门速度太慢。建议使用安全快门。安全快门就是在一定的快门速度范围内拍摄出来的图像会保证清晰，安全快门等于等效焦距，比如200MM的镜头至少设置1/200 Second的速度。
拍摄对象移动速度过快。建议高速度，比如拍鸟时用1/1600 Second。
光圈太大。为了保证清晰锐利建议用小光圈，比如F8。
做好镜头清洁，避免霉菌灰尘。

Fixing Google Pixel 3 volume issues

Clean Google FI cache. To do that, go to Google Fi>Storage.
Upgrade or re-install Google Fi.
Restart the phone.

How to use Focus Points Plugin for Lightroom

Make sure you are in the Library Module of Lightroom.
Select any photo from your catalog made with any Canon or Nikon DSLR camera. Make sure you select a photo (RAW, JPG, DNG) which comes directly out of the camera and has not been exported/saved in another format (photo which have changed Develop settings in Lightroom are OK), as that will often destroy the focus information metadata.
Now, start the plugin by going to the „Library“ Menu. Select the last menu entry, „Plug-In Extras“, and there „Show Focus Points“. Important: Note that you need to use the submenu “Plug-In Extras” in the “Library” menu, not the submenu “Plug-In Extras” in the “File” menu. The plugin dialog opens (as in the screenshots above). When you are finished with looking at the information for a particular image, you can select another photo from the photo strip below, or from another catalog directory. The plugin dialog will load and process the new photo (which takes a moment).

How to replace color using Pencil tool in Photoshop

Use selection tool to select the area you want to be changed the color.

2. Choose Pencil tool.

3. Open Color Picker. Choose the color you would like to use and paint over the image. The color will replace the selected area color. The color doesn’t change the unselected area.

Selecting focusing area in Sony A7R

There are eight focus area selections in Sony A7R.

Wide: the whole screen is active, so the subject can be anywhere. The camera determines focus by picking the object that is either closest to the camera, in the center of the frame, or a face if there is one resent. Focuses automatically on a subject in all ranges of the image. When you press the shutter button halfway down in still image shooting mode, a green frame is displayed around the area that is in focus.
Wide could be used in situations where your subject is by itself like portraits of one person or product photography. It is not recommend to use for multiple subjects or objects in the frame.
Zone: With Zone area selected, you can now select a large chunk of the frame to focus on, but the camera will still help select focus in that area. There are 9 different areas or zones, so you can have more control over where to focus. The Zone is good because you don’t have to move the spot around a lot, but it’s bad in that you still don’t have complete control.
Center: The Center Focus Area leaves the focus point in the middle of the frame, and that’s about it. You just have to put your subject matter in the center, and you will get it in focus.
Flexible Spot: you have a dot or square that you move around the screen and put on your focus point. With Flexible Spot, you control exactly where the focus goes.
Expand Flexible Spot: takes Flexible Spot M, but it allows the camera to try to help. When you’ve got your focus point on your subject, the Expand Flexible Spot will “expand” if needed outside of the focus point to grab focus.
Lock-On AF Expand Flexible Spot: This focus area takes Expand flexible spot, but then it will lock-on and follow the subject once you have started focusing. It could be used for tracing birds and sport objects.
It does what Lock-On AF Expand Flexible Spot does but in a different way. The first big difference is you have to activate this every time. You have to turn it on, put the subject in the center of the frame, and then select it. This makes it more involved than Lock-On AF Expand Flexible Spot. The other big difference is the way it works. Once you choose the subject, you don’t have to hold down the focus button. The camera just keeps following that subject.
Eye AF Eye AF goes even further into autofocus and face detection and will automatically find a subject’s eye, focus on it, and follow it!

To select focus area, go to MENU → (Camera Settings) → [Focus Area] → desired setting. Or press Fn.