THe image sensor in d-cams has an impact on the images u shoot. this image sensor is the permanent part of your d-cam. these sensors, like films, render colour differently, have different amounts of grain, different sensitivities to light etc.
RESOLUTION..... this refers to the sharpness and details in an image. thereby the companies are now capable of producing higher resolution cameras like 6 to 10 megapixels. higher the resolution better the pictures and also for purpose of good enlargements.
SENSITIVITY:..........like films the companies have adopted the same type of range for sensitivity of the sensors i.e. ISO. like films lower ISO sensitivity gives better results and if the ISO is increased, the quality suffers and grains (n0ise) appear more prominently. for instance, the ISO ranges from 100 to 3200. ..........and like films lower ISO needs more light than higher. so while shooting, check the ISO according to the density of light i.e. low light will need higher ISO AS OPPOSITE TO LOWER ISO suppose in sunlight.
ONE MORE thing to point out is that higher resolution(more megapixels) reduces the number of images to be recorded by a d-cam. while lower image quality(low resolution--less megapixels)allows u to store more images and that depends upon the necessity of shooting pix.
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Analogy between "Film camera & Digital camera" ends at ISO.... In a film camera the noise comes at higher ISO because of bigger size crystal used in emulsion..But in digital cam the story bit different.... How...???
Basically all the sensors are set to the base line ISO..ie if ISO of a cam is at 80 minimum.. So pumping up to 1600 ISO, won't make the sensor sensitivity to 1600 ISO.. What exactly happen is the cam still take the picture at 80 ISO.that is, the picture is still underexposed but after the sensor the signal is boosted or amplified thus mimic as if it is take at higher ISO.. So while boosting the signal..the digital noise is incorporated....
Well this is just an information I wish to share with you
Liu
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