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Re: Reading 32-bit BMP (with an alpha channel) in IDL [message #70023 is a reply to message #70022]

Tue, 09 March 2010 14:09

Brian Daniel
Messages: 80
Registered: July 2009

Member

On Mar 9, 2:28 pm, David Fanning <n...@dfanning.com> wrote:
> Brian Daniel writes:
>> I have a set of BMP images I need to read in. They have 4 channels,
>> red, green, blue and alpha. Every commercial image viewer I have can
>> open them, including matlab. Now, I could go to the trouble to
>> convert them to 24-bit or another image format, but why should I
>> change? IDL should be able to read this standard input. Read_bmp.pro
>> explicitly states that it can only read 24-bit. Is there something
>> built-in I'm not seeing? Is there a coyote function that already does
>> it?
>
> Here is an article that explains what is happening:
>
> http://www.dfanning.com/ip_tips/transparentpng.html
>
> TVImage will display these images correctly. :-)
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thue. ("Perhaps thos speakest truth.")

I appreciate the ability to display alpha banded images. TVImage is
extremely useful. However, I was trying to read BMPs with alpha
channels, and read_bmp.pro just doesn't cut it. I added a case for a
32 bit/pixel situation and added a dimension to the readu statement.
Its a small fix, but why didn't ITTVis put this in read_bmp.pro?
Alpha channel images are a standard format!

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[Message index]

		Re: Reading 32-bit BMP (with an alpha channel) in IDL By: penteado on Tue, 09 March 2010 14:58
		Re: Reading 32-bit BMP (with an alpha channel) in IDL By: Brian Daniel on Tue, 09 March 2010 14:09
		Re: Reading 32-bit BMP (with an alpha channel) in IDL By: David Fanning on Tue, 09 March 2010 11:28

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