C&C on lighting in this one

[Compaq]

I'm trying out a self made light box. I used three lights, one on each side and one on top. Had to correct for the colour. I hope the poorly chosen DOF doesn't make judging the lighting any harder.

I'd hope to get better shots of razors and other stuff, so I hope this more even lighting than what I would normally get.


Sau by Anders Myhre Brakestad, on Flickr


Thoughts?

 

[JoshuaSimPhotography]

Great pic, but why does the sheep have a weird lining on his back and butt? was it due to post processing?

 

[EDL]

Pretty grainy/noisy. What was the ISO?

 

[cgipson1]

Pretty grainy/noisy. What was the ISO?

Learn to read Exif.... or you can also get this info off of Flickr....

Camera - Canon EOS 40D
Exposure - 0.125 sec (1/8)
Aperture - f/5.6
Focal Length - 50 mm
ISO Speed - 400
Exposure Bias - 0 EV

I am not seeing much noise (there is no grain.. since it is digital). Anytime someone uses constant lights for photography, you will see longer shutter speeds and higher ISO's, with the attendant noise that can bring. This isn't bad though... and the lighting actually looks pretty good!

 

[Frequency]

liked it;you could have placed him in grass if available

 

[Frequency]

@CGIPSON: Would you please explain the difference between grain and noise? Regards

 

[JoshuaSimPhotography]

@CGIPSON: Would you please explain the difference between grain and noise? Regards

They're basically the same, but a grainy photo is also one very unclear (like pics taken with a phone) and noise is caused by high ISO, random blotches of pixels, making the pic unclear so they are very similar:thumbup:

 

[Frequency]

Thank you Joshua
In analogue photography, a higher iso film has bigger granules of silver iodide that leads to a grainy look to the image after development, right?
But how in digital format noise is generated for higher ISO?

 

[JoshuaSimPhotography]

Thank you Joshua
In analogue photography, a higher iso film has bigger granules of silver iodide that leads to a grainy look to the image after development, right?
But how in digital format noise is generated for higher ISO?

I quickly googled it. There are a number of reasons but the main one is caused by light striking the image sensor. To create a photo you need to convert photons into electrons. The more light you need, more conversion takes place and sometimes the sensor misinterprets the information into random pixels. So noise is really just false information.
Hope this helps

 

[Compaq]

Thanks for the help, guys

I was stumbled over the very long shutter speed I had to use, I was expecting flash sync speeds I did get a shadow, though. I could move my top light a little further away, that should help on that account, yes?

 

[Frequency]

Thank you Joshua
In analogue photography, a higher iso film has bigger granules of silver iodide that leads to a grainy look to the image after development, right?
But how in digital format noise is generated for higher ISO?

I quickly googled it. There are a number of reasons but the main one is caused by light striking the image sensor. To create a photo you need to convert photons into electrons. The more light you need, more conversion takes place and sometimes the sensor misinterprets the information into random pixels. So noise is really just false information.
Hope this helps

Conversion of photons to electron? :scratch: i think that is not possible within a camera....
Probably lack of photons reaching sensor prompts for greater exertion to attain proper exposure which ultimately results in the so called noise; could this be an explanation? Not sure

 

[cgipson1]

@CGIPSON: Would you please explain the difference between grain and noise? Regards

FILM has GRAIN.... Digital has NOISE. They look similar (unless magnified), but have totally different causes!
Digital CANNOT have GRAIN.. Digital has no silver halide in it!
Silver particles cause GRAIN in film, Heat / Underexposure cause noise in Digital images.

Quote from Film Grain WIKI:

Digital photography does not exhibit film grain, since there is no film for any grain to exist within. In digital cameras, the closest physical equivalents of film grains are the individual elements of the image sensor (e.g. CCD cell); just as small-grain film has better resolution than large-grain film, so will an image sensor with more elements result in an image with better resolution. As film grains are randomly distributed and have size variation, while image sensor cells are of same size and are arranged in a grid, direct comparison of film and digital resolutions is not straightforward.

Film grain (From Wikipedia, the free encyclopedia) Film grain - Wikipedia, the free encyclopedia
Film grain or granularity is the random optical texture of processed photographic film due to the presence of small particles of a metallic silver, or dye clouds, developed from silver halide that have received enough photons. While film grain is a function of such particles (or dye clouds) it is not the same thing as such. It is an optical effect, the magnitude of which (amount of grain) depends on both the film stock and the definition at which it is observed. It can be objectionably noticeable in an over-enlarged photographic film photograph.


Image noise (From Wikipedia, the free encyclopedia) Image noise - Wikipedia, the free encyclopedia
Image noise is random (not present in the object imaged) variation of brightness or color information in images, and is usually an aspect of electronic noise. It can be produced by the sensor and circuitry of a scanner or digital camera. Image noise can also originate in film grain and in the unavoidable shot noise of an ideal photon detector. Image noise is an undesirable by-product of image capture that adds spurious and extraneous information.

Further reading:

Noise vs Grain? - Photo.net Casual Photo Conversations Forum

digital vs. traditional 8 of 30

 

[cgipson1]

@CGIPSON: Would you please explain the difference between grain and noise? Regards

They're basically the same, but a grainy photo is also one very unclear (like pics taken with a phone) and noise is caused by high ISO, random blotches of pixels, making the pic unclear so they are very similar:thumbup:

Josh... they are only similar in appearance (if not magnified)! The cause of both is totally different.

 

[Frequency]

Thank you Gipson for your reply and links...
Is it correct to say digital images originally do not have noise, but develops them as an outcome of post processing... so can we expect all SOOC images to be noiseless? Images from low resolution cameras are having high degree of noise in comparison, probably because they have less number of pixel points to register all the light that reaching the sensor? that fills any space between two pixel points develop as noise? In that case noise in digital images must have a more uniform nature, because pixels are placed uniformly...

 

[tirediron]

@CGIPSON: Would you please explain the difference between grain and noise? Regards

They're basically the same, but a grainy photo is also one very unclear (like pics taken with a phone) and noise is caused by high ISO, random blotches of pixels, making the pic unclear so they are very similar:thumbup:

Josh... they are only similar in appearance (if not magnified)! The cause of both is totally different.

Precisely. Grain is specific to film. It is the actual grains of silver-halide (or other light-sensitive salts) used to record the image. The more sensitive the film (the higher the ASA/ISO) the physically larger the grains were and thus, the more "grainy" the appearance of the image. "Noise" on the other hand is electronic noise produced by the camera's sensor as it is electronicaly adjusted by the camera or photographer to make it more sensitive to light.