Increasing bit depth of an image from 4 bit to 8 bit
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Hi I have an image of skull in gray format and i first decreased its bit depth from 8 bit to 4 bit,which was easy but now the problem is with recovering the original image from this transformed 4 bit image to 8 bit.....hope u got my point... waiting for the reply..
2 Comments
Jan
on 22 Sep 2011
Please post how you converted it to 2 bits. As far as I can see, some color information is lost by this procedure. Then you cannot recover the original image.
Answers (1)
Walter Roberson
on 22 Sep 2011
You cannot recover the full depth of an image if you reduced the image to below ceil(log2(N)) bits per pixel where N is the number of unique colors (or shades) in the image ( N = length(unique(IMG(:))) )
8 Comments
Image Analyst
on 25 Sep 2011
Why would it work on one and not the other? Just divide by something (16) to get your image into the range 0-15 (a 4 bit range), and then multiply that by 16 to get it into the range 0-255 (an 8 bit range). Explain why you're unable to divide and multiply by 16 on *one* of the images. What error message do you get?
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