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Re: MIP from BMP Images [message #76812 is a reply to message #76811]

Thu, 07 July 2011 10:12

penteado
Messages: 866
Registered: February 2018

Senior Member
Administrator

On Jul 7, 12:15 pm, M R <manisha....@gmail.com> wrote:
> 1. for the following command>IDL print, file
>
> the output contained the list of images being loaded. But I have
> noticed that even though the images are stored in an ascending order
> in the folder, the output is not so. Instead the output is
> 0,1,10,100,101,102........12,120,121,.......13,130,131 and so on.
> Is this because the files are not being loaded in an ascending manner
> or it's just the output that is not in an order?

The order you see in the file array is the order file_search gave you.
By default, it sorts alphabetically, to ensure a consistent result
across platforms. If you use the nosort keyword to file_search, they
will be in whatever order the OS decides to use. If you want a
particular order, then you probably will have to first sort the array
in the order you want.

>
> 2. with >IDL help, image the output is
>
> image byte =array [3,2216,1254].
>
> (a). why is there a 3 in the first position?

The array image has whatever dimensions the image in the file had. In
this case, it looks like the file is an RGB image with the first
dimension being the channel, and each channel being 2216x1254.

> The array should be
> in the format of [2216, 1254, i] where i can be anything from 0-255.

This sentence makes no sense to me.

> (b). is there anything that is causing the 'image' to change its
> array format? I haven't declared 'image' as an array.

IDL does not even have variable declarations. read_bmp is just giving
you the image, with the dimensions it had in the file. If the file is
a 24-bit RGB, then the result is color interleaved (color is the first
dimension).

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[Message index]

		Re: MIP from BMP Images By: David Fanning on Thu, 07 July 2011 10:40
		Re: MIP from BMP Images By: penteado on Thu, 07 July 2011 10:12
		Re: MIP from BMP Images By: M R on Thu, 07 July 2011 08:15
		Re: MIP from BMP Images By: Konstantinos on Thu, 07 July 2011 08:09
		Re: MIP from BMP Images By: Konstantinos on Thu, 07 July 2011 07:57
		Re: MIP from BMP Images By: R.G.Stockwell on Wed, 06 July 2011 16:04
		Re: MIP from BMP Images By: penteado on Wed, 06 July 2011 16:18
		Re: MIP from BMP Images By: M R on Wed, 06 July 2011 13:40
		Re: MIP from BMP Images By: M R on Wed, 06 July 2011 12:41
		Re: MIP from BMP Images By: M R on Wed, 06 July 2011 12:35
		Re: MIP from BMP Images By: David Fanning on Wed, 06 July 2011 12:22
		Re: MIP from BMP Images By: M R on Wed, 06 July 2011 11:57
		Re: MIP from BMP Images By: Wout De Nolf on Wed, 06 July 2011 09:57
		Re: MIP from BMP Images By: David Fanning on Wed, 06 July 2011 10:04
		Re: MIP from BMP Images By: M R on Fri, 08 July 2011 08:13

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