Where can I learn about photography curve?

[gustav[] pEña]

any page about it?



gustav[] pEña

 

[T_om]

any page about it?



gustav[] pEña

????

Are you referring to the "Curves" command in PhotoShop?

Tom

 

[egpj]

¿Gustavo, usted está hablando de curvas en Photoshop?

 

[gustav[] pEña]

1- I would like to understand the curve inside the PDF format file name CONTRAST CONTROL in thits page.

http://ilford.com/html/us_english/bw.html


2- I also would like to understand the curve I see on my Digilux on the LCD.


3- And finaly, the curve in the Leica lens PDF files.

I dont even know if it is the same thing. I would like to learn about any photograpfy curve. 😀

I will appreciate any page about it.

gustav[] pEña

 

[Roger Hicks]

Dear Gustav,

For an explanation of density curves (D/log E) see the free module entitled DENSITY in the Photo School section of www.rogerandfrances.com.

Cheers,

Roger

 

[egpj]

Gustavo, do you have the Digilux 1 or 2? If you have the Digilux 2 then I think you are referring to the Histogram display. The histogram display shows a 0-255 (0 = not enough light to register on the ccd or in a image and 255 being totally washed out white) d-max value. This tells the amount of light that is hitting each pixel on the ccd of your camera and relates it to a graph form called the histogram. I believe that the Digilux2 has a histogram that remains in the viewfinder and dynamically updates depending on the amount of light hitting the sensor (ccd). This allows you to change your settings (i.e. aperture/shutter speed) and see the resulting change in the histogram. Does this help out any.

As for the curves in the leica documents. The link below has a good article. There are others, just google "reading mtf charts".

http://luminous-landscape.com/tutorials/understanding-series/lens-contrast.shtml

Glenn