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Re: Read _ tiff with Sub_Rect Keyword [message #44903 is a reply to message #44892]

Fri, 22 July 2005 06:52

btt
Messages: 345
Registered: December 2000

Senior Member

raval.chintan@gmail.com wrote:
> Hi...
>
> I have a geo tiff file which containing the 14000 X 14000 Pixels
> (Samples and Lines), I am reading it through the read_tiff function.
> Over here i want to show that image on to the 500 X 500 window Means
> by buffer for image will contain dimension [3,500,500]. For that I am
> reading with the help of read_tiff function with the sub_rect keyword.
> Where i m reading the pixels based on the ratio of 14000/500, but it is
> taking to much time. While the same thing in ENVI it is taking less
> time to read the image and display it. So is there any other method for
> read that image fast. for that i have to write my own code in IDL to
> read the tiff file?
>
> Regards,
> Chintan Raval
>
Hello,

I don't think I understand what it is that you are trying to do, but I
would assume that IDL and ENVI are accessing the image using the same
procedure. Here is an example of how to use the SUB_RECT keyword (which
I use all the time on much smaller images with no problem.)

file = FILE_SEARCH(!DIR, 'image.tif')
whole = READ_TIFF(file[0])
sub = READ_TIFF(file[0], sub_rect = [200, 200, 50, 100] )
TV, whole
TV, sub, 100, 0

Is this example similar to how you are using the SUB_RECT keyword?

Ben

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[Message index]

		Re: Read _ tiff with Sub_Rect Keyword By: edward.s.meinel@aero. on Tue, 26 July 2005 06:15
		Re: Read _ tiff with Sub_Rect Keyword By: raval.chintan on Tue, 26 July 2005 05:06
		Re: Read _ tiff with Sub_Rect Keyword By: Chris[2] on Mon, 25 July 2005 08:32
		Re: Read _ tiff with Sub_Rect Keyword By: raval.chintan on Mon, 25 July 2005 03:36
		Re: Read _ tiff with Sub_Rect Keyword By: btt on Fri, 22 July 2005 06:52
		Re: Read _ tiff with Sub_Rect Keyword By: Chris[2] on Wed, 27 July 2005 12:28

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