There
are even a few cameras with ISO 6400 on the market. However, these cameras
produce a lot of digital noise and the images are almost unusable.
Q: What are image file formats?
A: When your digital camera processes an image, it takes the data from the
image sensor and processes it into the format you specify. The file format you
specify, combined with the image size, determines the file size and, therefore,
the amount of room needed on your camera??™s memory card. Most digital
cameras use the JPEG (Joint Photographic Experts Group) file format, while
some use the TIFF (Tagged Information File Format) and RAW file format.
CAUTION
Compact digital cameras have smaller sensors than their
larger brethren. Therefore, information is recorded on
smaller photosites. Some compact digital cameras with
resolutions of 5 megapixels and up may have visible
noise in images shot at ISO ratings of 400 and above.
NOTE
Increasing the ISO setting can introduce digital noise,
which is similar to the graininess that appears in images
recorded with film cameras using high-speed film.
Many cameras have noise filters built-in. You can also
purchase third-party noise filters as plug-ins for your
image-editing application.
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