how is a photo saved to a memory card in my camera?

3 Answers

  • Karl W
    Lv 5
    1 decade ago
    Favorite Answer

    With film, the incoming light (the image) causes a chemical reaction in the emulsion. Until the film is developed, this image is "latent" in other words it can't be viewed. In development, the chemical properties in the film cause changes so that the image emerges, then the unused silver is cleared away so that the negative or transparency becomes clear. Then you can view, scan, project or enlarge your image into other forms.

    In a digital camera, the lens focuses the image onto a sensor such as a CCD or a CMOS device. These devices have a matrix of millions of tiny receptors in order to capture the image in enough detail to be useful. The sensor basically converts light to electrical impulses. These impulses are then convertered to numerical values by an A/D (analog to digital) converter. These numerical values (digits) can then be stored in memory, transported (via email or over network lines), manipulated in software, etc. Once the image is in it's final form, it can be printed, etc.

    I hope this helps!

  • 1 decade ago

    The photo is saved as a digital file which describes the photo. The file contains some general information (like the dimensions in pixels), and detailed info that describes each pixel.

    It only becomes a viewable pic when some software and hardware (like monitors and printers) reassembles the file into a pic.

    A pixel is a virtual colored dot which is created by the cameras sensor. Each picture is made from millions of pixels.

    Each pixel is described by 24 computer bits. Because any color can be made by projecting a combination of red, green and blue shades of light, a pixel's color is described by 8 bits each for the red/green/blue shades. (Some cameras use 48 bits to get even more shades.)

    So a picture on the memory card (or on a hard drive or CD) is just a long string of bits describing the pic and all its pixels. A 5 MP camera generates a file over 15 MB to do the describing of 1 pic. (JPEG compression reduces this to 2 to 3 MB.)

    Good Luck

  • 1 decade ago

    Your digital camera is like a portable computer with the compact flash card as the hard drive. When you press the button to take a picture the mirror inside your DC lifts up and the light hits the electronic sensor or a electronic photo cells (RGB cells) and the magic happens, the photo transfer to your card and viewable, by you in seconds.

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