Re: [Gimp-developer] 32 bit bmp files again

[Pavel <pavel pamsoft cz>]

Hi Todd,

just my impression and feelings: 32 bit BMP is an oxymoron. MS has
designed that format, but never managed to implement it. That's why they
still have their ICO format, which is a color image and 2-bits mask.
Instead of implementing full alpha-channel raster format, MS rather
accommodated PNG format. So, for example, if you want to create Windows
Vista compatible icon with alpha channel, you have to embed a PNG image
into the "ico" file.

In other words, you can create 32-bit BMP file, but you will hardly find
a software capable of reading it.

Pavel

On Sun, 2014-08-03 at 14:03 -0400, Todd Marshall wrote:
> To add to my question thread myself; I can load the file into Paint, but if
> I try to save it, Paint says '24 bit' only (has no 32 bit option) and if I
> save that, it's the same size.  If I save from Gimp to 24 bit it's 15K.  If
> I save from Gimp to 32 bit it's 20K.  so whan I save in Paint, and it says
> '24 bit' it saves to 20 K file.
>
>
>
> On Sun, Aug 3, 2014 at 1:58 PM, Todd Marshall <tamnt54 gmail com> wrote:
>
> > I know this is an old topic but I am having trouble, producing 24 bit .bmp
> > files is good. If I add alpha layer and save (export) to .bmp, it's not
> > good. (to save 32 bit pixel image) Windows API simply will not load the
> > file. I've tried changing 'save colorspace information' and this does not
> > work.
> > Any fix? I guess I have to try a different program.  Don't need any
> > special functionality, just a 32 bit file that the windows api can load.
> > (the LoadImage() api function in win32)
> > Thanks!
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