| 27 Nov 2008 04:09 AM |
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I need a programming routine that gives the exact equivalent of loading an image in the ENVI display, and using Save Image As > Image File > then leaving all the defaults as they are (Resolution =24 bit color ( BSQ) , output file type ENVI, and then saving the file with no file extension.
This method produces two files (and envi file and a header) that look identical to what you get by using envi_output_to_external_format, /envi
but there must be some slight difference as the programme i am using to read it in sees only a grey image unless the file is saved using the ENVI interface method.
Any thoughts on why this is happening or how to resolve greatly appreciated.
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MariM
Veteran Member
Posts:2396  
| 01 Dec 2008 08:56 AM |
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Save Image As and Save File as are not equivalent. Saving from the display will only save a 1-band byte scaled image or a 3-band RGB byte scaled image. The data are byte scaled to look as they are in the ENVI display, which by default applies a 2% stretch. When you use Save File As from the File menu, ENVI does not change the nature of the data - it will include all bands of the data unless spectrally subset and keeps the original data type. If you use ENVI_OUTPUT_TO_EXTERNAL_FORMAT, it is the same as using Save File As. There is no equivalent ENVI routine to save the display. Under the hood, ENVI is using the IDL routines such as WRITE_TIFF or WRITE_PNG. If you are trying to get something similar to what ENVI does when saving from the display, I would suggest using STRETCH_DOIT to apply a 2% stretch on the bands you wish to output, then use ENVI_OUTPUT_TO_EXTERNAL_FORMAT.
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Deleted User
New Member
Posts: 
| 02 Dec 2008 08:06 AM |
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Thank you - that worked perfectly. I didn't even need to use the ENVI_OUTPUT_TO_EXTERNAL_FORMAT, just used the out_name from the stretch I performed. (I initially used DECOR_DOIT, and then performed the stretch on this output and produced the desired file).
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Deleted User
New Member
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| 28 Jun 2010 04:19 AM |
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I am trying to do something similar to this, but I just want to create a JPEG for the contents of an open window. Is there an easy way to grab what is being viewed in a window and JPEG it? I need to create a one-button solution that automatically selects JPEG as the format, inputs the quality, and saves it down. Thanks.
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