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problem with image data classes

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mahesh chathuranga
编辑： mahesh chathuranga 2014-7-8
I opened the raw image(int 8).I wanted to stretched the raw image values from 0 to 1. for that i used mat2gray(). then I applied some arithmetic calculations to it (subtraction and divide). Out put is ranges from -1 to 1(double). Then i save my result in to tif image using imwrite.but when i open the saved image, the values are not same as the actual results(it's now in uint8).But I want the actual value for another Analysis. what is the reason for this and how can i solve this.

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