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i'm trying to read a RGB BMP format image and a JPG format image. but it appears that both have same size(bytes) on my work space . is it possible to read the image with their actual disk space?

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Pradeep Gowda
Pradeep Gowda 2015-2-6
评论： Pradeep Gowda 2015-2-8
reply as soon as possible.

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Image Analyst
Image Analyst 2015-2-6
You'd have to use fread(), instead of imread(), to read in the image data byte-for-byte. Of course it does no decompressing that way - it's just pure raw bytes and would look like garbage if you went to display it. Why do you want to do that anyway?
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Image Analyst
Image Analyst 2015-2-7
That's a completely different question, and one that you asked and accepted an answer to in a completely different discussion, so I won't answer it here.

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John D'Errico
John D'Errico 2015-2-6
编辑：John D'Errico 2015-2-6
So all you want to know is how much disk space was taken up by the image, NOT to read it in with the file still in compressed format?
Just use dir. Look at the struct form that dir returns. One of the fields is bytes, i.e., the number of bytes taken up by the file on disk, as it is currently stored.
For example, in my current directory, I have a jpg file stored.
d = dir('untitled.jpg')
d =
name: 'untitled.jpg'
date: '05-Feb-2015 10:59:57'
bytes: 20014
isdir: 0
datenum: 7.36e+05
If your goal is to also know the space required to store the image in an uncompressed form, then you need only to know the size of the image.

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