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

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.


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
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)

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