How to isolate the main subject of a photograph on a pure white background with photoshop CS5?

It is not a response based on Photoshop:

You are making things difficult for yourself with your granite fund. The first thing you should do is shoot your objects against a plain background, then, if necessary, select the background and not the object, then reverse the selection (but if done correctly, you can get a background so white you will not even need to cut it).

A sheet of printing paper can be a much more practical background than stone. But there are quite cheap accessories like this to allow you to shoot objects correctly on a neutral background (they facilitate the overexposure of the background so that it appears in pure white in the image).

If you insist on doing it in a difficult way with Photoshop, look for tutorials on "clipping paths".

Answer the edited question: usually choose a contrast background (black for something clear). In this same image, if you look carefully, while its background is very neutral (R = G = B), the object itself is slightly blue (R = GGDSE).

How do I change my background on my MacBook?

On my MacBook Air, I accidentally somehow pasted an image into Olaf on my screen and when I try to change it, it only appears on a black screen. I tried changing the screen saver and it just does not work. Does anyone know what is wrong with my computer?

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c # – 3d characters in 2d background game suggestions

First of all, I want to make games again, I have made some for personal use in gamemaker, but I never finished them, since the school always got in the way or they would be eliminated when my computer broke. I almost finished college in software development and I wanted to make a complete game now in c ++ or c #.

I was thinking about doing something like Rune factory 4, I'm not sure how to do it since I'm not sure how this game is made. I really love the style of this game and I feel more confident in my drawing skills than in my 3D modeling skills and I'm not sure I can do justice to the game if it were all in 3D. I have used Blender, but I have not had enough time to be completely in conditions with it, I think Rune Factory is mainly 2D, with only the character / monster and NPC being 3D. I can not find any information on how to achieve this though.

I do not know if you can create a 2D background and then add a 3D character and you can still interact with 2D objects and move or if you need to do more. I read in another similar publication, someone suggested something about the shaders, but they did not provide much information about it, besides saying that it was something that maybe you should use. I like to think that I am a good artist and I would prefer not to need so many 3D models. The only thing that really makes me want to do 3d full is that I really like how you can build a farm in the village of the harvest moon.

I want to make a game with the fight and agriculture and I'm planning to do it in the unit, but I could do it with an unreal engine if that was a better option. Would this be a good engine for this kind of thing? I hope to do everything that is not music or sound effects. I've only worked on games based on 2d sprites with mosaics, so this will be very new to me and I would appreciate any help on how to do it or engine suggestions. Thank you

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Depth of field: is it beneficial to use a full frame for a blurred background?

From the depth of field and the defocus equations of the background, we can derive the following approximate equations for a background at infinity:

b = f ^ 2 / (x_d * N)
DoF = 2 * x_d ^ 2 * N * C / f ^ 2

where second the disk size is blurry, DoF It's the depth of field, F is the focal length, x_d is the distance of the subject, north is the opening F number and do It is the circle of confusion.

Immediately we noticed that second can be represented in terms of DoF and vice versa:

b = 2 * x_d * C / DoF
DoF = 2 * x_d * C / b

Now, since we are behind great blurred background second, we must consider how it varies depending on the size of the sensor. x_d, the distance of the subject, is the same for the equivalent image. DoF It is also the same for an equivalent image, as long as you can achieve the DoF You are looking for both the full frame and the cut body. What is different is the circle of confusion. do: divided by the clipping factor in a clipping sensor. Therefore, background blurring is also divided by the clipping factor in a clipping sensor. However, the sensor size is divided too much by the clipping factor in a clipping sensor.

Then, as a conclusion, the amount of blurring of the background as a percentage of the size of the sensor remains the same (with the size of the sensor and the size of the background blurring disk divided by the clipping factor). Therefore, in the full-frame and clipping sensor bodies, an equivalent amount of background blurring is obtained, as long as you can achieve the DoF you are looking for.

Therefore, we must analyze if it is possible to achieve what is desired. DoF in a culture sensor body. When mounting a f / 1.8 lens (such as the Canon Nifty Fifty, EF 50mm f / 1.8 STM), it is possible to have a depth of field of just centimeters as shown in this example:

Shallow DOF

Clearly, we can see in the image that the depth of field is too shallow (image information: focal length of 50 mm, subject distance of 1000 mm, f / 1.8, body of the clipping sensor, which gives a DoF of 27 mm). Therefore, it is generally possible to achieve a sufficiently superficial DoF in the body of a culture sensor.

Now, I must admit that it is easier to achieve an extremely superficial DoF in a full-frame camera, but that is not usually what the photographer wants, as the image of the cactus shows. In addition, full-frame cameras require a longer focal length, and maintaining the aperture number F is not easy with increasing focal length, so it is debatable whether it is really easier to achieve an extremely shallow DoF in a full-frame camera .

Applications: Will the applications exempt from background optimization be affected by the energy savings generated by a low battery?

I have deactivated the optimization for Whatsapp. I want to limit Whatsapp only if the battery is low.

Does LineageOs 14 already ignore the whitelist with little battery ready to use?

I wonder about this because WhatsApp Web reads & # 39; the phone is not connected & # 39; too often on wifi and deactivated the optimizations, as a countermeasure (although it does not seem to be working) … despite that, I'm curious about Android and lineage behavior in relation to this.

css – background sensitive – stack overflow in Portuguese

The problem is that there is nothing I can do to solve the problem. What can be?

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Reference request: mathematical background necessary to learn about sheaves.

Because of my interest in type theory (and in higher type theory), I have found that learning about sheaves could be useful (for example, for sheaf models of type theories). There are Kashiwara and Schapira Categories and sheaves, but that seems out of reach at this time.

My background includes some category theory and some algebraic topology, and I will probably have to read more of both. However plus I need it? Maybe learn something from algebraic geometry, or higher category theory?

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