Is RGB and True colortype image is same?
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Bruno Pop-Stefanov on 20 Jan 2014
Yes, this is the same. "True color" refers to the depth of an RGB image. With true colors, each pixel of an RGB image is 24-bit: each of the three components (red, green, blue) has a value between 0 and 255 (8 bits).
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Image Analyst on 20 Jan 2014
"True" color means color in the visible wavelength range, which means red, green, and blue, so "True" color is the same as RGB. You could also have other kinds of color like pseudocolor where it's an integer image where each value gets mapped into a color via a pseudocolor look up table, or a hyperspectral image (like from satellites) where they represent different wavelengths, some that are invisible. Any of those spectral channels can be mapped into red, green, or blue, so even though they are RGB images, they are not really "true color" if they didn't construct the RGB image from visible wavelength spectral channels. They would be pseudocolor images.