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Re: How do you read a .bmp file?


From: Henry F. Mollet
Subject: Re: How do you read a .bmp file?
Date: Sat, 29 Sep 2007 12:12:46 -0700
User-agent: Microsoft-Entourage/11.1.0.040913

I could not find a 'bmpread.m' in octave-2.9.13 nor on octave-forge site.
I did find 'bmpwrite.m' on the octave forge site.
Henry


on 9/29/07 10:54 AM, Robert A. Macy at address@hidden wrote:

> Not in the binary
>   octave-2..9.12-3-setup.exe
> 
> I can strip the header from the file, leaving 512 by 512
> bytes of data.  So how do I read in that file?
> 
> Something about opening the file in 'b' mode and
> sequentially assign the value to a variable.  like the
> wavread function does.
> 
> Just hoped there was something already written to do this.
> 
> Robert
> 
> On Sat, 29 Sep 2007 19:31:35 +0200
>  Søren Hauberg <address@hidden> wrote:
>> I believe there is a 'bmpread' function in the Octave
>> forge image package. I haven't used it though...
>> 
>> Robert A. Macy skrev:
>>> Thank you for your very prompt response and URL's.
>>> 
>>> I think I went through this before and found Imagmagic
>> is
>>> always missing or such.  Do remember I got some custom
>> code
>>> from here that allowed me to make colored .bmp images.
>>  
>>> 
>>> 
>>> I do most of the work on the Win98
>>> running binary octave 2.1.50a
>>> 
>>> I have an adjacent machine running WinXP Professional
>> which
>>> I could try running the binary 2.9.12. I don't use that
>>> version of octave, because all my plot routines died.
>>> 
>>> However, I could open the .bmp with it, store the data
>> as
>>> .txt, and then open the data file using 2.1.50a
>>> 
>>> Is that possible?  Does 2.9.12 have an easy way to read
>>> .bmp's ?
>>> 
>>> Robert
>>> 
>>> On Fri, 28 Sep 2007 23:58:31 -0400
>>>  "James Sherman Jr." <address@hidden> wrote:
>>>> Have you tried the image package from octave forge?
>>>>  Found here:
>>>> http://octave.sourceforge.net/packages.html
>>>> 
>>>> You can get older versions of the packages to work
>> with
>>>> 2.1.50 here:
>>>> 
>>> 
>> 
> http://sourceforge.net/project/showfiles.php?group_id=2888&package_id=29785
>>>> I'm assuming that you still need to have the same
>>>> requirements as the
>>>> current build, i.e. ImageMagik installed.
>>>> 
>>>> James Sherman
>>>> 
>>>> On 9/28/07, Robert A. Macy <address@hidden>
>> wrote:
>>>>> I have a simple .bmp file, actually in two forms.
>>>>> 
>>>>> Both are 512 by 512 pixels, one is RGB 24 bit format
>>>> (?)
>>>>> and the same gray image is in single ?? format.  Of
>>>> course
>>>>> the single format is 1/3 the size of the RGB image.
>>>>> 
>>>>> Short of trashing the header, reading the file byte
>> by
>>>>> byte, is there some easy way to read in the pixel
>>>> values
>>>>> for a 512 by 512 image?
>>>>> 
>>>>> I'm using Win98 to run octave 2.1.50a [I have to use
>>>> 50a to
>>>>> keep all those plotting functions.]
>>>>> 
>>>>> Robert
>>> _______________________________________________
>>> Help-octave mailing list
>>> address@hidden
>>> https://www.cae.wisc.edu/mailman/listinfo/help-octave
> 
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