### ImageMagick version

7.1.1.21

### Operating system

Windows

### Operating system, version and so on

Windows 11

### Description

![result](https://github.com/ImageMagick/ImageMagick/assets/15813085/8b1beec6-b09a-43c7-837f-6b300375dffd)

I am using imagemagick (7.1.1.21) to load some icon in a.bmp icon, resize it and output a b.bmp image.

I use the following command `convert a.bmp -resize 24x24 b.bmp`

You can find attached the input / output files.

There's 2 problems:

- The white background is converted to black
- The resize is incorrectly processed

I tried to force loading using bmp2, bmp3 format without success.

Using the same command with imagemagick V6 gave correct results (cf bv6.bmp attached).

Questions:
Is there something new introduced in V7 that explains the output?
If so, what should be the correct command?

Note: the following command give something similar to V6. But a bit complicated for a simple reduction operation, isn't it?
`convert a.bmp -channel a -negate -channel rgba -define filter:blur=0.1 -resize 24x24 b.bmp`


### Steps to Reproduce

Simply use `convert a.bmp -resize 24x24 b.bmp` with the provided image

### Images

[images.zip](https://github.com/ImageMagick/ImageMagick/files/13423624/images.zip)


BMP resize and convert troubleshoot
This is a GitHub Issue
repo:ImageMagick
owner:ImageMagick
Title : BMP resize and convert troubleshoot
Issue date:

--- start body ---
### ImageMagick version

7.1.1.21

### Operating system

Windows

### Operating system, version and so on

Windows 11

### Description

![result](https://github.com/ImageMagick/ImageMagick/assets/15813085/8b1beec6-b09a-43c7-837f-6b300375dffd)

I am using imagemagick (7.1.1.21) to load some icon in a.bmp icon, resize it and output a b.bmp image.

I use the following command `convert a.bmp -resize 24x24 b.bmp`

You can find attached the input / output files.

There's 2 problems:

- The white background is converted to black
- The resize is incorrectly processed

I tried to force loading using bmp2, bmp3 format without success.

Using the same command with imagemagick V6 gave correct results (cf bv6.bmp attached).

Questions:
Is there something new introduced in V7 that explains the output?
If so, what should be the correct command?

Note: the following command give something similar to V6. But a bit complicated for a simple reduction operation, isn't it?
`convert a.bmp -channel a -negate -channel rgba -define filter:blur=0.1 -resize 24x24 b.bmp`


### Steps to Reproduce

Simply use `convert a.bmp -resize 24x24 b.bmp` with the provided image

### Images

[images.zip](https://github.com/ImageMagick/ImageMagick/files/13423624/images.zip)


--- end body ---
