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what is the difference b/w image size 256*256 and image size 256*256*3?

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I m doing project with medical images... i have read a .tiff image and calculated size ..it is showing 256*256*3..what is it??

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Walter Roberson
Walter Roberson am 15 Feb. 2013
The image that has *3 is an RGB image. The image that does not have *3 is a grayscale image (or a pseudocolor image)
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Walter Roberson
Walter Roberson am 3 Apr. 2013
Medical images can have RGB, depending on how the image is created.
Image Analyst
Image Analyst am 3 Apr. 2013
Sometimes if you save images without specifying the correct options you could get an image stored as color even though it's grayscale. I often see jpg or bmp images that people uploaded as having 3 color channels even though it's a grayscale image in appearance. It saved it as color with all 3 channels being the same gray level image.

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