Question about Fuji Endeavor 200ix Zoom APS Point and Shoot Camera

1 Answer

Pictures How does a picture develop

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    MVP:

    An expert that got 5 achievements.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Contributor
  • 58 Answers

It's quite complicated to explain in detail, and there are a number of different processes, but I can start by saying how the essential chemistry of B&W processing works.

A film emulsion contains tiny crystals of a silver halide (Silver chloride, bromide etc.) contained in a layer of gelatin, coated on a plastic backing. Silver halides are sensitive to light.

There are other layers such as an anti-reflection layer behind the light sensitive layer to prevent light being scattered back to produce a 'halo' around bright areas, (Anti-halation layer) and a scratch resistant layer on the front.

Additionally dye chemicals are added which enhance the halides sensitivity to red light, to which otherwise it would be insensitive. These are known as dye sensitisers.

Only imprefections in the crystals are actually sensitive, as these contain silver ions which are not fully bound to the halogen. When a photon interacts with the crystal near the sensitve site an electron is released which can reduce the ion to a single atom of silver.

These single atoms ar enot enough to produce a visible image, but comprise a latent image within the emulsion. In order to make the latent image visible we must amplify the latent image in some way. This is done chemically by a process known as development.

There are a number of chemicals formulations which can be used as developers (including urine!), but all are chemical reducing agents. (Opposite of oxidising agents.) These convert the silver halide to metallic silver.

It so happens that for many reducing agents metallic silver acts as a catalyst, so where there is silver the reaction proceeds faster than where there is not. Of course as more silver is produced the greater the catalytic action, so the develoment process accellerated as it progesses.

This forms clumps of silver around the original silver atoms. These clumps consist of very small grains of silver, finer than any powder and these appear black. These form a negative image. (Black where light fell on the film.)

(These tiny grains are not what photgraphers refer to as 'grain'. In fact the 'grain' in a photograph is more to do with the distribution of development sites, and the random nature of the arrival of individual photons.)

Most developers are realtively benign chemicals but some are toxic and carcinogenic. These are not used much these days but are still availble.

Unfortunatley this is quite a slow process, and there is a tendency to also reduce unexposed halides somewhat. This produces an overall 'fog' to the immage. To minimise this and speed the process up an accellerator is usally added.

Accellerators are alkalis. Some formulas use quite strong alkalis like sodium hydroxide, but others use rather innoccuos substances like borax.

Development continues until the developing chemical is removed or the chemicals are exhausted. If the film is developed too much than the silver clumps begin to overlap and you get a completly black area. Further development does not make those areas any blacker even if more silver is produced!


This process is of course conducted entirely in darkness.

Most formulations use both developer and acellerator together, but sometimes these are used separatley to give better controll of the negative density. Here the emulsion is soaked in the developer, and transferred to the accellerator bath. This limits the amount of developer in the negative so heavily exposed areas do not develop as much. This allow a scene with a wider range of brightness to be recorded.

(Note that the film itself can record a much wider range in the latent image, than can be developed.)

Normally development is stopped by immersing the film in an acidic bath, which reacts with the accellerator as well as washing away developer.

The anti-halation layer dyes are usually washed out during develpment.

Of course this still leaves undeveloped silver halides in the emulsion. These are removed by fixing the image.

This is necesary for two reasons. First in a film the halide crystals have a whilte milky appearance. You need light to shine through a film duing enlargement, so that's no good. Alxo the halide will eventually turn black on exposure to light.

Fixing the image usually is a matter of washing the negative in a soultion of sodium thiosuphate. (Comonly called 'hypo'.) Silver halides are only very poorly soluble in water, but sodium thiosulhpates affinity for soft metal ions overcomes this reaction with the silver, to produce sodium halide. If this is silver chloride you get salt!)

To get a print, you expose paper treated on one surface with an emulsion, to a projected image of the enlarger and develop that in a similar way.

So there you have it. Color is a bit more complicated involving layer with different sesitivity to colored light, and dyes which are produced by the action of delvelopers.

For more details start with http://en.wikipedia.org/wiki/Photography

Posted on Jan 22, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How or what do I need to develop this pictures


Hi Tencia:
If you can send them to your computer you can then print them.

Mar 29, 2016 | ZTE Unlocked Z222 Flip Phone With Camera...

2 Answers

Are the same chemicals used to develop color pictures as black and whites?


They are very similar but the black and white process uses developer, stop bath, fixer and water while the color process uses developer, bleach, fixer and stabilizer.process for black and white process for color

Aug 19, 2013 | Photography

1 Answer

Can I develope pictures that were taken with a digital camera?


Yes! All you have to do id copy the pictures to a disk on key and go to your local camera store and ask them to develop the pics.
Good Luck!

Jan 17, 2013 | Photography

1 Answer

I have a 8 year old 57in Sony projection HDTV,when the picture is dark you can see faint blue lines in a curved arch like pattern across the screen.Any ideas? Thanks


The tv problems is call a convergence picture problems,it is just starting to developing.This problems when it is fully developing into a convergence picture problems to the tv eventually.Tv will develope into a colors lines R,G,B mis alignments,have a colors shadow pictures or into a picture 3D look alike.Eventually the tv convergence board will dies,have to have it parts replaced like 2 STK convergence ICS and some or all of it resistors too.This problems the tvs shops will cost u like $300-350 for parts and lobors.

Aug 13, 2011 | Sony KP-57WS500 57" Rear Projection...

1 Answer

How can I take pictures off my Droid cell phone at Sam's to have them developed. The clerk said to bring in my charger cord but I don't know how that could possibly work.


It is possible that the clerk said that so you can bring your data cable to the store to allow them to connect your phone to their computer in order to develop your pictures. Your charger cord consists of a data cable and wall adapter in order to plug it into the wall. If some reason they cannot connect your phone to their computer, you could always insert a micro SD card into your phone and copy your pictures to it. Any photo developing shop can develop pictures from a micro SD card. Hope this helps!

Apr 25, 2011 | Motorola Mobility Droid X (MB810) Verizon...

1 Answer

My TV picture has a developed a green tint to it


Hi , I think thats is your green cathode in the picture
tube , the only way to fix that is a picture tube regenerator machine you will find that in a repair shop
thats a delicate operation...

Mar 10, 2010 | Televison & Video

1 Answer

Having trouble with my camer shooting slow between pictures


You might have a USB virus or spyware infection in the memory card. I suggest you have Kodak develop the pictures then wipe the memory card clean. And the pictures might be dark because of the camera settings and or the development quality. Try resetting the camera. Hope this works.

Jan 27, 2009 | Canon EOS-5D Digital Camera

1 Answer

Developing pictures


uninstall reinstall the printhead, calibrate clean then try to print again. check the type of paper too

Jun 25, 2008 | Kodak EASYSHARE 5500 All-In-One InkJet...

2 Answers

Developing pictures


depending on the type of film you are using and where you are taking it could be the problem. if you are using professional film and taking it to a pharmacy to get developed, the chemicals used at these places will erase the images off the film and appear as if the film is blank.

Nov 11, 2007 | Nikon N75 35mm SLR Camera

1 Answer

Developed Pictures


I didn't think double exposures were possible with digital cameras! You learn something new every day! BUT--to find out if it is the camera or some doofus who is sloppy making prints for you, download a whole bunch to your (or anyone's) computer, and see if there are any double exposures. I think whoever developed your pictures must have had one hell of a hangover. COMPLAIN. I bet they will send you redone and complete new copies.

Feb 04, 2007 | Fuji FinePix E550 Digital Camera

Not finding what you are looking for?
Photography Logo

109 people viewed this question

Ask a Question

Usually answered in minutes!

Top Fuji Photography Experts

kakima

Level 3 Expert

101642 Answers

Jax Planet
Jax Planet

Level 2 Expert

921 Answers

TC CAMERA REPAIR.Com...

Level 2 Expert

165 Answers

Are you a Fuji Photography Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...