Re: How do you read a .bmp file?

[Ben Abbott]

There are jpgread and pngread scripts available. Is converting to one  
of those formats first an option?



On Sep 29, 2007, at 12:12 PM, "Henry F. Mollet" <address@hidden>  
wrote:

> 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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