Is density positive or negative?
When people use the word "density" casually, they usually mean mass density (or sometimes number density). Mass (as far as we know) can only be positive, and the number of particles can only be positive, thus those types of densities are only positive.
What does it mean if the electric charge density is negative?
If the electric charge density of a region of space is negative, that would mean that there are more negative charges than positive charges in that region. When people use the word "density" casually, they usually mean mass density (or sometimes number density).
What is the difference between dense and nondense breast tissue?
Breast tissue is composed of milk glands, milk ducts and supportive tissue (dense breast tissue), and fatty tissue (nondense breast tissue). When viewed on a mammogram, women with dense breasts have more dense tissue than fatty tissue. On a mammogram, nondense breast tissue appears dark and transparent.
What is the difference between a thick and a thin negative?
A thick, or dense, negative appears dark, whereas a thin negative appears transparent. If a negative appears to be very dark overall with limited see-through areas, it has a high density and is an indication of overexposure.
What is a thick negative?
'Thin' vs 'Thick'/ 'Dense' negatives - Overexposed vs Underexposed film photos. A thick, or dense, negative appears dark, whereas a thin negative appears transparent. If a negative appears to be very dark overall with limited see-through areas, it has a high density and is an indication of overexposure.
How do I print a negative dense?
1:4710:09DARKROOM PHOTOGRAPHY - DENSE FILM NEGATIVES - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd the aperture is on the lens is 2.8. Which is wide open trying to get as much light as I can andMoreAnd the aperture is on the lens is 2.8. Which is wide open trying to get as much light as I can and you can see the thin area of the negative. Here.
What does an overdeveloped negative look like?
An overexposed negative will look dark. For some photographers, minor amounts of overexposure can be an intentional stylistic decision that increases saturation and contrast. However, extreme overexposure will give you increased grain, low contrast, and dull, gray highlights.
What does it mean to have a thin negative?
A negative that is underexposed and normally developed has little or no detail in the shadow areas that are important to the subject. It is described as "thin". The highlight areas will be rich , transparent and full of detail but they will render as depressed muddy greys instead of bright highlights.
Can you touch film negatives?
Wash and dry your hands before handling photo negatives. Only touch the edges of the film—the oils from your hands can damage the image of the negative. Before you store them, gently remove any accumulated dust to prevent scratches inside their protective sleeve.
Why are my negatives cloudy?
If a film has a milky or cloudy appearance after it has been fixed, it indicates a film has not been fixed sufficiently. This could be the result of: An insufficient level of fixer. Using fixer that is old or exhausted.
How do you fix overdeveloped negatives?
Just bleach the negatives in a Potassium Ferricyanide 10g + Potassium Bromide 10g per litre bleach, same as used for toning, wash well and then redevelop in a normal film developer.
Is it better to over or under develop film?
A correctly developed film will produce negatives with plenty of tonal range and punchy prints. An overdeveloped film produces rich black negatives that print with too much contrast and increased grain.
What does overdeveloped color film look like?
When overdeveloped, most color negative films demonstrate color casts that are different in shadowed and highlight regions. In addition, pushed film has a high level of fog and grain. Examination of processed color negative film is an important step in evaluating the results of photomicrography experiments.
What does an underexposed photo look like?
What Is Underexposure? Underexposure is the result not enough light hitting the film strip or camera sensor. Underexposed photos are too dark, have very little detail in their shadows, and appear murky.
What happens if you over Develop film?
If you leave the film in the developer too long, the film is overdeveloped. The result of over development is increased contrast, along with increased density in the mid tone and highlight areas of the picture.
How do you read a negative image?
A Smartphone Trick for Viewing NegativesBy enabling “Color Inversion”, “Invert Colors,” or “Negative Colors” under your phone's “Accessibility” setting, the camera turns into a viewer that allows photographic negatives to be viewed as positives. ... And here is the positive with the color inversion setting “On.”Voilà!
How do I print a thin negative?
Use the highest contrast setting on your enlarger, or #4 paper. Mix the developer with much less water, maybe even use the stock straight. Heat the paper developer solution before using. You can go to 80 degrees F or more for brief periods without harming the paper.
How do you fix overdeveloped negatives?
Just bleach the negatives in a Potassium Ferricyanide 10g + Potassium Bromide 10g per litre bleach, same as used for toning, wash well and then redevelop in a normal film developer.
What does dense mean in film?
graded adjective. If you describe writing or a film as dense, you mean that it is difficult to understand because it contains a lot of information and ideas.
How to know if your negs are dense?
Mike my understanding is that you need to use the frame numbers as reference. If your negs are dense, look at the numbers and if they are dark and spreading out then cut your development time. If the numbers look crisp or even light then you are over-exposing.
What does dark negative mean?
I have always been taught that the darker the negative, the more over exposed it is , which will result in a lighter positive, the lighter the negative the more underexposed it is hence the darker the positive, dark negative equates light positive, light negative equats dark positive, in very simple terms, if the negative is dense, it is overexpose, if the negative is light, then it is underexpose, and both situations will create the exact opposite on the positive paper.
What does it mean when the electric charge density of a region of space is negative?
If the electric charge density of a region of space is negative, that would mean that there are more negative charges than positive charges in that region.
What does "density" mean?
When people use the word "density" casually, they usually mean mass density (or sometimes number density). Mass (as far as we know) can only be positive, and the number of particles can only be positive, thus those types of densities are only positive.
What is the definition of apparent density?
Is defined as the ratio of the dry specimen mass to the volume of its solid part. It is therefore measured in kg/m3. For dense, low porosity stones the differences between real and apparent density are very small; for these stones it is sufficient to determine the apparent density; in other cases the real density should be also determined (EN 1936).
What is the minimum density of gasoline?
Each gasoline has its composition, but, in general the minimum density is 0.71 g/cm3 or 710kg/m3 and the maximum is 0.75 g/cm3, or 750 kg/m3
What happens to the density of water when you increase the pressure?
Pressure - Look imagine you take a glass of water from earth to space it vaporise as soon as possible due to absence of pressure. What happens to its density? it decreases since the volume has increased enormously. This was a example. Even if you decrease temperature by a little the density decreases and if you increase the pressure the density increases. Please do not confuse this with regelation. It occurs only with water (it is only a phenomena of ice).
Is there any measure of energy that is greater than zero?
Electrical energy from the clouds is transformed to thermal energy, acoustic energy (sound) and light energy upon leaving the clouds. Hence there is some measure of energy (definitely greater than zero) being transferred/transformed. Since energy cannot be created nor destroyed, what we have around is what the universe has to make do with it - and it is not negative or zero - it is being transformed from one form to another always.
Does density change with volume?
Temperature - Since density is mass per unit volume it will change if the volume changes (mass can’t change until you add some more of the same material to it, which same as increasing the volume and decrease it in the same way). Volume can change when you heat or cool the substance down. S, temperature is a important factor.
What should a properly exposed negative be?
As alluded to above, a properly exposed (and developed) negative should fair somewhat in between - it should have a good balance of blocked and transparent areas in the frame. This translates into a good mix of tones in the final images, touching on shadows to midtones to highlights.
What does it mean when a negative is underdeveloped?
Where a negative is underdeveloped but properly exposed, there is decent detail in the shadows but highlights look dull. Overall, the negative appears relatively thin, with little areas fully developed to give dark material that represents highlights. There is no way to fix the underdeveloped negative itself, but it can be mitigated by increasing contrast during scanning or printing.
What does it mean when a negative is brighter?
Hold up the shiny face of the negatives towards yourself. The darker regions on the negative represents the brighter regions in the final image, vice versa. A larger variety in densities indicates a larger variety of brightness values, which means more detail capable of being reflected in the final image. Underexposure translates into a highly transparent negative and vice versa; underdevelopment translates into a flat negative, and overexposure translates into a contrasty negative with potentially a loss of detail in dense regions.
What does overexposure on a negative mean?
Gross overexposure on film results in very dark negatives with limited see-through areas. There might even be areas on the negative that are completely blocked out by black material. Overall, a majority of the frame appears dark. Overexposure, unless done to an extreme, can usually be mitigated in the scanning or printing process. While it takes a bit of work, it is usually possible to retain quite a bit of detail that is seemingly lost in the highlights.
What are scratches on a negative?
Scratches are visible on your negatives and scan or prints, usually in form of thin threads and creases. Scratches results in blank areas as the emulsion has been scratched off before development, so the area receives inadequate development and contains no information. The crease can also
How to tell underdevelopment from underexposure?
You can distinguish underdevelopment from underexposure by reading the shadow values, which correspond to the transparent areas on the negative. Where there is sufficient separation in the shadow values, it is not an exposure problem.
Is grain a characteristic of film?
Grain per se is a neutral, inherit characteristic. Generally, grain is a desirable trait in film photos as it is what distinguishes a film from digital, as it engenders a sense of nostalgia in photos. Normally, it is therefore acceptable for grain to be visible in a film photo, so long as it does not cause unwanted distraction from the image itself. Some photographers, however, have a particular love for rough grain in their photos which they develop into their distinct style.
What is dense in math?
3 mathematics : having between any two elements at least one element The set of rational numbers is dense.
What does it mean to be dumb?
stupid, dull, dense, crass, dumb mean lacking in power to absorb ideas or impressions. stupid implies a slow-witted or dazed state of mind that may be either congenital or temporary. stupid students just keeping the seats warm stupid with drink dull suggests a slow or sluggish mind such as results from disease, depression, or shock. monotonous work that leaves the mind dull dense implies a thickheaded imperviousness to ideas. too dense to take a hint crass suggests a grossness of mind precluding discrimination or delicacy. a crass, materialistic people dumb applies to an exasperating obtuseness or lack of comprehension. too dumb to figure out what's going on
What is the 4th density negative?
With fourth-density negative comes many abilities and possibilities of which you are familiar. The fourth-density is more dense and it is far more difficult to hide the true vibrations of the mind/body/spirit complex. This enables fourth-density negatives, as well as positives, the chance to form social memory complexes.
What is negative harvest?
The negative harvest is one of intense disharmony and the planet will express this. Questioner: The planet has a certain set of conditions in late third-density, and then the conditions are different in early fourth-density. Could you give me an example of a negatively polarized planet and the conditions in late third-density ...
What is dense breast tissue?
Dense breast tissue refers to the appearance of breast tissue on a mammogram. It's a normal and common finding.
What does it mean when you have scattered areas of fibroglandular density?
B: Scattered areas of fibroglandular density indicates there are some scattered areas of density, but the majority of the breast tissue is nondense. About 4 in 10 women have this result.
How do doctors determine if you have dense breast tissue?
Breast tissue is composed of milk glands, milk ducts and supportive tissue (dense breast tissue) and fatty tissue (nondense breast tissue). Radiologists use mammogram images to grade breast tissue based on the proportion of dense to nondense tissue. According to the BI-RADS reporting system, the levels are (from left to right) A: almost entirely fatty, B: scattered areas of fibroglandular density, C: heterogeneously dense, and D: extremely dense.
How many women have dense breasts?
About 1 in 10 women has this result. In general, women with breasts that are classified as heterogeneously dense or extremely dense are considered to have dense breasts. About half of women undergoing mammograms have dense breasts.
Do breasts become less dense as you age?
Are younger. Your breast tissue tends to become less dense as you age, though some women may have dense breast tissue at any age.
Can breast cancer be detected in dense breast tissue?
There's some evidence that additional tests may make it more likely that breast cancer is detected in dense breast tissue. But additional tests carry additional risks, and no additional testing method is proved to reduce the risk of dying of breast cancer.
Is dense breast cancer a risk factor?
Women with dense breasts, but no other risk factors for breast cancer, are considered to have a higher risk of breast cancer than average. They may benefit from annual breast cancer screening. Dense breast tissue makes it more difficult to interpret a mammogram, since cancer and dense breast tissue both appear white on a mammogram.
