Cannot convert to BMP3 in Windows MSYS2 shell?

[sdaau]

Hi,

The documentation on http://www.imagemagick.org/Usage/formats/#bmp says to use this command, if we want to convert to BMP3:

you can enforce the generation of a BMP3 format image using...

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       convert image BMP3:image.bmp

I have a command like this:

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/d/msys64/mingw64/bin/convert.exe /d/my-project-dir/my_image.xpm BMP3:/d/my-project-dir/my_image.bmp

... which fails with:

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convert.exe: unable to open image 'BMP3;D:\my-project-dir\my_image.bmp': Invalid argument @ error/blob.c/OpenBlob/3490.

The version is:

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$ /d/msys64/mingw64/bin/convert.exe --version
Version: ImageMagick 7.0.8-14 Q16 x86_64 2018-11-06 https://imagemagick.org
Copyright: © 1999-2018 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC HDRI Modules OpenMP
Delegates (built-in): bzlib cairo djvu fftw flif fontconfig freetype gslib gvc jbig jng jp2 jpeg lcms lqr ltdl lzma openexr pangocairo png ps raw rsvg tiff webp wmf xml zlib

What is the right command syntax that I can use, so that I can convert my .xpm image to BMP3?

[snibgo]

What is your platform? If Windows, why are you using forward slashes between directories?

As you are using IM v7, I suggest you use "magick", not "convert".

[sdaau]

Many thanks, @snibgo:

What is your platform?

MSYS2 ( https://www.msys2.org/ ) bash shell under Windows 10.

Imagemagick was installed through the `pacman` package manager in MSYS2, using:

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pacman -S mingw-w64-x86_64-imagemagick

If Windows, why are you using forward slashes between directories?

Because I'm working in the MSYS2 `bash` shell, which - as it is `bash` - uses forward slashes by default.

I think there is some path handling within MSYS2, so in the end, the programs end up with paths in Windows format regardless (you can notice there are backslashes in the paths noted in the error).

I just want to note that, when I just use this:

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/d/msys64/mingw64/bin/convert.exe /d/my-project-dir/my_image.xpm /d/my-project-dir/my_image.bmp

... the process completes fine, without a problem. The problem only appears when I try to prefix `BMP3:` in front of the output file path.

As you are using IM v7, I suggest you use "magick", not "convert".

Thanks, but got same results - without BMP3 prefix it is fine:

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$ /d/msys64/mingw64/bin/magick.exe /d/my-project-dir/my_image.xpm /d/my-project-dir/my_image.bmp
$

... but with BMP3 prefix it fails:

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$ /d/msys64/mingw64/bin/magick.exe /d/my-project-dir/my_image.xpm BMP3:/d/my-project-dir/my_image.bmp
magick.exe: unable to open image 'BMP3;D:\my-project-dir\my_image.bmp': Invalid argument @ error/blob.c/OpenBlob/3490.

Is there any other way to specify BMP3 output format, other than prefixing it to the output file path?

[snibgo]

Yes, bash uses forward slash, that's fine.

Windows has a concept of devices, eg "D:". Bash on Windows doesn't have that concept, so something does a translation. To complicate the situation, IM uses a prefix plus colon to mean a file format.

You command writes to:

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BMP3:/d/my-project-dir/my_image.bmp

... but that gets translated to:

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BMP3;D:\my-project-dir\my_image.bmp

The translation, with semicolon ";" is bad. I suppose the translation is done by MSYS2, which I suppose has a bug.

You might try backslashes, even though bash expects forward slashes. Or use a relative path, avoiding the leading "/d/". Or avoid the leading "BMP3:", piping the output to mogrify which can use "-format BMP3".

[sdaau]

Many thanks @snibgo - got it now:

The translation, with semicolon ";" is bad. I suppose the translation is done by MSYS2, which I suppose has a bug.

You might try backslashes, even though bash expects forward slashes.

Excellent, that was it: I just tried replacing the original output file path (with forward slashes), with the path written in the error message:

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$ /d/msys64/mingw64/bin/magick.exe /d/my-project-dir/my_image.xpm 'BMP3:D:\my-project-dir\my_image.bmp'

... and it passed without a problem!

Or use a relative path, avoiding the leading "/d/". Or avoid the leading "BMP3:", piping the output to mogrify which can use "-format BMP3".

Great to keep this in mind, thanks!